Tips dari KOMINFO untuk menghadapi Ransomware WannaCrypt
Willy Sutrisno
Alfons Tanujaya
Langkah 2 dan 3 sederhana ?
Itu mah ngga kerja namanya :p. Bisa seharian nge backup doang.
Langkah 9 .... sederhana dan jadul.
Mohon maaf. Minta izin comel.
Salam,
Alfons
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Isa Lpse
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Firdaus Rachmawan
Tatag Danang SN
Sekedar berbagi,
untuk patch XP dan Windows 2008 Server bisa download patch di
https://blogs.technet.microsoft.com/msrc/2017/05/12/customer-guidance-for-wannacrypt-attacks/
seharusnya saat ini sudah tidak menyebar karena domain relaynya sudah kena sinkhole, info lengkap bisa dicek di :
https://gist.github.com/rain-1/989428fa5504f378b993ee6efbc0b168
salam
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Willy Sutrisno
Willy
On 14 May 2017, at 12:34, Willy Sutrisno <wi...@sutrisno.me> wrote:
Bantu forward, semoga bermanfaat. Silahkan check di internet untuk informasi lebih jauh.
<4B230A43-36EA-4CEA-8C9B-D1D7247008F0-2475-0000038909FDE343.jpeg>
Rizky M. Dinata
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Isa Lpse
Alhamdulillah sejauh ini aman om Willy.Best Regards,Rizky M. DinataThis e-mail message contains information intended solely for the intended recipient and is confidential or private in nature. If you are not the intended recipient, you must not read, disseminate, distribute, copy or otherwise use this message or any file attached to this message. Any such unauthorized use is prohibited and may be unlawful. If you have received this message in error, please notify the sender immediately and then delete the original message from your machine.
Bagaimana network teman teman hari ini, sejauh ini aman aman saja?--—
WillyGood judgement come from experience; experience come from bad judgement - Mulla NasrudinOn 14 May 2017, at 12:34, Willy Sutrisno <wi...@sutrisno.me> wrote:Bantu forward, semoga bermanfaat. Silahkan check di internet untuk informasi lebih jauh.<4B230A43-36EA-4CEA-8C9B-D1D7247008F0-2475-0000038909FDE343.jpeg>--Sent from my Google INBOX
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Tatag Danang SN
Sekedar berbagi,
untuk patch XP dan Windows 2008 Server bisa download patch di
https://blogs.technet.microsoft.com/msrc/2017/05/12/customer-guidance-for-wannacrypt-attacks/
seharusnya saat ini sudah tidak menyebar karena domain relaynya sudah kena sinkhole, info lengkap bisa dicek di :
https://gist.github.com/rain-1/989428fa5504f378b993ee6efbc0b168
salam
--
Tatag Danang SN - Helpdesk
On 2017-05-14 17:33, Firdaus Rachmawan wrote:
waaaahh makasi banyak atas share nyaberguna bangettDaus
On Sun, May 14, 2017 at 4:06 PM, Isa Lpse <isa....@gmail.com> wrote:
kasus ini sebennya udah lama. cuman infonya lambat ajah.
Pada tanggal 14 Mei 2017 11.34, "Willy Sutrisno" <wi...@sutrisno.me> menulis:
Bantu forward, semoga bermanfaat. Silahkan check di internet untuk informasi lebih jauh.
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Bagus Ahmad Maulida
dan apakah tindakan prefentif masih perlu dilakukan ?? misal dg blok port 139, 445 dan 3389 ?
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Alfons Tanujaya
Kalau Windowsnya sudah diupdate lebih dari 2 bulan yang lalu, itu aman banget. Patchnya itu patch bulan Maret.
Yang harus hati-hati Windows XP dan Windows Server 2003 yang tidak ada automatic updatenya, pastikan update manual dulu (download dari tempat lain) dan instal MS17-010 setelah itu baru boleh konek.
Sebenarnya resikonya sudah rendah banget karena WannaCrynya tinggal sedikit sekali. Tapi nothing wrong with a bit paranoid.
Salam,
Alfons
Iya, makasih mas danang
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Terima Kasih
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Oky Lisman
Iya, makasih mas danang
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Willy Sutrisno
https://www.malwaretech.com/2017/05/how-to-accidentally-stop-a-global-cyber-attacks.html
Dan baca juga ini (not technical):
The 22-year-old Brit who stopped the global cyberattack is donating his $10,000 reward to charity
Harijanto Pribadi
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Danang
Danang
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Bantu forward, semoga bermanfaat. Silahkan check di internet untuk informasi lebih jauh.
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Terima KasihBagus Ahmad M------------------------------------------------------------PT. Dinamika Metamorfosa Indonesia
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Jefri A
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Oky Lisman
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ganesha pranayoga
TAP~{•}
Isa Lpse
Alfons Tanujaya
Dear Friends,
Brainstorming saja.
- Backup data dan jadikan offline. Atau buat pengamanan kredensial bagi yang ingin mengakses data backup sehingga ransomware ngga bisa akses. Jangan buka full akses ke data backup. Kalau kena ransomware data backup ikut di enkrip yah sama saja bohong, bukan data backup lagi namanya. Tapi data moyung.
- Gunakan antivirus di Linux (ini kalau anda percaya Linux sudah bisa kena virus, kalau ngga percaya dan tetap klaim Linux kebal virus yah silahkan saja dengan keyakinan anda).
Salam,
Alfons
From: id...@googlegroups.com [mailto:id...@googlegroups.com] On Behalf Of Isa Lpse
Sent: Thursday, June 22, 2017 12:39 PM
To: id...@googlegroups.com
Subject: Re: [IDNOG] Re: Tips dari KOMINFO untuk menghadapi Ransomware WannaCrypt
Waduh.. makin bahaya ajah nih. bisa nyerang linux. waduh bagaimana nih. apakah ada solusi?
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Jimmy IndoAsli
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Alfons Tanujaya
Kalau begitu pencegahannya ditambah lagi jadi ada 3 poin :
- Selalu update OS dan semua aplikasi dengan patch terkini guna mencegah eksploitasi. (walaupun dalam prakteknya mungkin bisa saja patch membuat server bermasalah .... nambah kerjaan admin nih).
- Jika memungkinkan tambahkan TFA dalam proses login administator.
- Backup data dan jadikan offline. Atau buat pengamanan kredensial bagi yang ingin mengakses data backup sehingga ransomware ngga bisa akses. Jangan buka full akses ke data backup. Kalau kena ransomware data backup ikut di enkrip yah sama saja bohong, bukan data backup lagi namanya. Tapi data moyung.
- Gunakan antivirus di Linux (ini kalau anda percaya Linux sudah bisa kena virus, kalau ngga percaya dan tetap klaim Linux kebal virus yah silahkan saja dengan keyakinan anda).
SIlahkan ditambahkan embah2 admin.
Selamat menunaikan ibadah puasa baig yang menjalankan.
Salam,
Alfons
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Tatag Danang SN
selain dari om Alfons bisa juga baca baca info soal erebus di
regards
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Tatag Danang SN
ganesha pranayoga
Sent from my iPhone
dikshie
Cryptovirology: The Birth, Neglect, and Explosion of Ransomware
https://cacm.acm.org/magazines/2017/7/218875-cryptovirology/fulltext
Cryptovirology was born out of scientific curiosity of what the future
may hold for software attacks that merge cryptographic technology with
malware. It started at Columbia University as a natural by-product of
an unnatural union: a former hacker placed in a room with a
cryptographer, both given ample time with which to contemplate the
dystopia of tomorrow. Collectively, given our backgrounds, we had
amassed a body of highly unconventional scientific problems that
hackers face when infiltrating computer systems as well as the
foundational cryptography with which to solve those problems.
Our list of problems included the following question: How devastating
could the most insidious malicious software attack be against a
target? To put things in perspective this was circa 1995. Many people
had not heard of the Internet, and among those that did, many were
obtaining an email address for the first time. The typical home
computer was not online all the time. Users had to use dial-up modems
when they wanted to check email. USB technology did not exist.
3.5-inch floppy disks were the norm. Cryptography, for millennia, had
been perceived as a purely protective technology, and in particular as
a way to hide the content of messages, secure data at rest, and
authenticate users.
On the one hand we were aware of the failed AIDS Information Trojan
that scrambled the names of the victim's files using a symmetric key
and demanded a ransom to unscramble them. From a technological
perspective this attack crumbled since the decryption key could be
extracted from the code of the Trojan.
In addition, we had in mind the grotesque vision of H.R. Giger in the
science-fiction movie Alien.5 Of particular interest to us was the
alien facehugger. This creature resembled a cross between an insect
and an octopus. It would wrap its legs around the victim's face and
insert a tube down the victim's throat. It wrapped its long tail
around the victim's neck and squeezed. The victim would enter a form
of coma, while the egg the face-hugger implanted into the abdomen
would incubate into a drone (or queen) and burst through the stomach
of the victim, thus completing a phase of the alien life cycle.
There was no way to safely remove the facehugger once attached.
Touching the facehugger caused it to tighten its tail and restrict the
flow of air to the lungs. Cutting it caused its corrosive alien blood
to bleed out and disintegrate everything it seeped through (including
the floors of the spaceship). Try as they did the crew's scientists
could not find a way to safely remove facehuggers from their victims.
The AIDS Trojan and the facehugger idea defined in our minds the
"where we are now" versus where malicious software attacks might
evolve to, respectively. We sought a digital analogue of the
facehugger, namely, a forced symbiotic relationship between a computer
virus and its host where removing the virus is more damaging than
leaving it in place.
But what we discovered was not exactly that which we sought. We
discovered the first secure data kidnapping attack. We called it
cryptoviral extortion. In cryptoviral extortion, the attacker
generates a key pair for a public key cryptosystem and places the
"public encryption key" in the cryptovirus. The corresponding "private
decryption key" is kept private. The crypto-virus spreads and infects
many host systems. It attacks the host system by hybrid encrypting the
victim's files: encrypting the files with a locally generated random
symmetric key and encrypting that key with the public key. It zeroizes
the symmetric key and plain-text and then puts up a ransom note
containing the asymmetric ciphertext and a means to contact the
attacker. The victim sends the payment and the asymmetric ciphertext
to the attacker. The attacker receives the payment, decrypts the
asymmetric ciphertext with his private key, and sends the recovered
symmetric key to the victim. The victim deciphers his files with the
symmetric key.
At no point is the private key revealed to the victims. Only the
attacker can decrypt the asymmetric ciphertext. Furthermore, the
symmetric key that a victim receives is of no use to other victims
since it was randomly generated.
We presented this attack along with the facehugger analogy at the 1996
IEEE Security and Privacy conference.8 The discovery was perceived as
being simultaneously innovative and somewhat vulgar. Years later, the
media relabeled the cryptoviral extortion attack as ransomware. In the
conference paper we proposed that electronic money could be extorted
by the attacker. This is what happens today using bitcoin. We have
observed that what we described over 20 years ago is the exact
"business model" used today in an estimated $1 billion-a-year criminal
industry: the industry of ransomware.
We discovered that public key cryptography holds the power to break
the symmetry between the view of an antivirus analyst and the view of
the attacker. The view of the antivirus analyst is the malware code
and the public key it contains. The view of the attacker is the
malware code, the public key it contains, and the corresponding
private key. The malware can perform trapdoor one-way operations on
the victim's machine that only the attacker can undo. A multitude of
cryptovirology attacks, both overt and covert in nature, are based on
the unique advantage this gives to the attacker. These methods
weaponize cryptography as an attack tool as opposed to the previous
uses that were defensive in nature.
In our 2004 book Malicious Cryptography: Exposing Cryptovirology9 we
presented the following analogy: cryptovirology is to penetrating
computer systems as cryptanalysis is to cracking ciphers. It is a
proactive anticipation of the opponent's next move and suggests that
certain countermeasures should be developed and put into place. To
counter cryptoviral extortion we recommended a diligent backup
strategy and searching for crypto code where it does not belong. We
warned the public about these threats and similar ones by publishing
our findings, thereby providing a significant head start to develop
and deploy defenses.
It has been a long road that we have followed, fraught with skepticism
and criticism, ultimately resulting in worldwide recognition that
cryptoviral extortion is a severe threat. Over the years we have given
numerous lectures on cryptovirology. We have experienced the spectrum
of possible reactions. Some concurred that the threat is real. Others
insisted that cryptoviral extortion was pointless, that it offered
nothing to the attacker beyond deleting the hard drive. Still others
professed that no victim would ever pay.
Shortly after we published our book, it was met with harsh criticism.
An expert who had written books on computer viruses published a
scathing review, concluding that for those seriously involved in the
study of malware the book is of "little practical use." This opinion
directly translates to telling the public there is no need to worry
about ransomware. We attributed such reactions to the inherent
resistance many people feel toward new ideas, especially ideas that
merge two previously distinct disciplines, in this case, malware and
cryptography. It seemed to us that the difficulties known as the
"innovator's dilemma"2 apply also to proactively addressing threats
and risks.
Cryptovirology has proven itself to be a formidable threat. Ransomware
attacks make the news daily. Victims include individuals, hospitals,
police precincts, universities, transportation systems, and government
offices. We even saw the development of "ransomware as a service"
where cryptovirology tools are sold to criminals that perpetrate
cryptoviral extortion (for more details on ransomware, see
https://en.wikipedia.org/wiki/Ransomware). This past year we have
witnessed a vicious downward spiral: the more organizations that were
attacked, the more news coverage there was on ransomware. The more
news coverage there was on ransomware, the more criminals got in on
the action, prompting ever more news coverage. The media amplified
cryptovirology awareness among law-abiding citizens and criminals
alike.
Social and legal reactions to the damage followed. In fact, the trip
further down the spiral changed the very definition of a "computer
breach." Prior, a computer breach was synonymous with the exfiltration
of sensitive data from an organization. This past year the meaning
expanded to account for ransomware. A recent fact sheet published by
the U.S. Department of Health and Human Services on ransomware and
HIPAA states that when electronically protected health information is
encrypted by ransomware a breach has occurred and the incident
therefore constitutes a disclosure that violates HIPAA.6 The
justification for this definition is that the adversary has taken
control of sensitive health information. This is a significant change
in the definition of a computer "breach" since now, due to the threat
of cryptoviral extortion, a breach can occur even when no sensitive
data is exfiltrated!
A highly publicized and effective ransomware attack was carried out
against the Hollywood Presbyterian Medical Center, and the hospital
paid $17,000 in bitcoin for restoration. This, along with the epidemic
levels of similar attacks, prompted the state of California to enact a
new law that addresses ransomware.1 "SB-1137 Computer crimes:
ransomware" amends Section 523 of the Penal Code to outlaw the
introduction of ransomware into a computer system with the intent of
extorting money. Reuters reported that the WannaCry crypto-worm from
May 2017 locked up more than 200,000 computers in more than 150
countries.7 The attack exploited a vulnerability hoarded by the NSA
that was exposed by whistle-blowers and later patched. The attack was
nonetheless severe since organizations and individuals were not
diligent enough in patching.
We finally point out that cryptovirology has influenced popular
culture as well, inspiring the plot in Barry Eisler's techno-thriller
Fault Line.3
Over the years we have observed a palpable reluctance by security
companies to describe the cryptoviral extortion attack in detail and
discuss countermeasures. We view this as being fundamentally flawed;
it is the classic phenomenon of "reactive security" (acting after the
attack) as opposed to the preventative "proactive security."
We believe ransomware is the tip of the iceberg. Most cryptovirology
attacks are covert in nature, allowing the adversary to securely steal
information completely unnoticed. These attacks would slip past or
stymie the vast majority of computer incident response teams. It took
over 20 years for cryptoviral extortion to gain worldwide recognition,
and it appears that the bulk of these other attacks, which are fully
described in the scientific literature, are heading in the same
direction: destined to be overlooked until a large-scale real-world
attack is publicized. Santayana's aphorism: "those who cannot remember
the past are condemned to repeat it"4 seems to apply equally well to
malicious cryptography.
2017-06-28 20:29 GMT+09:00 ganesha pranayoga <neshen...@gmail.com>:
> Selain wannacry masih ada ransomware yang lainnya. Ada yang tau cara kerja
> ransomware petya?
>
>