DUTCH-BANGLA BANK COMPROMISED BY THE NOTORIOUS SILENCE GANG

DUTCH-BANGLA BANK COMPROMISED BY THE NOTORIOUS SILENCE GANG

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Bangladesh Cyber Heist 2.0:
Silence APT goes global

Singapore, 03.07.2019 – Group-IB, an international company that specializes in
preventing cyber attacks, has established that Silence, a Russian-speaking
cybercriminal group is likely to be behind the brazen attack on Dutch-Bangla
Bank’s ATMsresulting in the theft of $3 million, the amount reported by the local
media. The actual amount of money stolen could be much higher. This is one of
Silence’s most recent international attacks which, indicates that the gang has
expanded its geography and has gone global, focusing now on APAC markets.

Thefinal stage of the brashcyber attack, which started months earlier, took place
in Dhaka on May 31, 2019, according to the local media reports. In CCTV
footage posted by local newspapers two Ukrainian mules with their faces
covered are seen withdrawing money from Dutch-Bangla Bank’s ATMs. They
made phone calls every time before withdrawing money, which immediately
prompted Group-IB’s Threat intelligenceteam’s interest and indicated that this
could likely beinvolvement of an organized financially-motivated cybercriminal
group rather than simple skimming attack. At the time, Group-IB Threat
Intelligence team was already aware that Silence had been carrying out
operations in Asia.

Group-IB has been tracking Silence and their infrastructure since 2016 and
published a report “Silence: Moving into the darkside” in September 2018 which
was the first to describe the group’s tactics and tools in detail. The information
gathered by Group-IB’s Threat Intelligence team and comprehensive knowledge
about Silence’s infrastructure suggested that Dutch-Bangla Bank’s hosts with
external IPs 103.11.138.47 and 103.11.138.198 had been communicating with
Silence’s C&C (185.20.187.89) since at least February 2019. During the attack
on Dutch-Bangla Bank, the cybercriminals likely used the following Trojans –
Silence. Downloader (aka TrueBot), Silence.MainModule (MD5
fd133e977471a76de8a22ccb0d9815b2) which allows to execute remote
commands covertly and download files from the compromised server, and
Silence.ProxyBot (MD5 2fe01a04d6beef14555b2cf9a717615c), which executes
the tasks of the proxy server and allows the attacker to redirect traffic from a
hidden node to a backconnect server via compromised PC.

Once they gained access to the bank’s infrastructure, Silence went on to the next
stage of the attack – money withdrawal. One of the instances was shown on the
CCTV from May 31 published by the local media. Based on the TTPs used by
Silence, the money could have been stolen in one of two ways: the hackers could
have either compromised the bank’s card processing system or used the custom
Atmosphere software,a set of tools for ATMs jackpotting. The detailed description
of Silence’s toolset is available in Group-IB’s report “Silence: Moving into the
darkside”. “What we see now is that Silence is continuing to shift their focus from
the CIS and neighbouring countries to international markets,” comments Rustam
Mirkasymov, Head of Dynamic Analysis of Malicious Code at Group-IB. “Having
tested their tools and techniques in Russia,Silence has gained the confidence
and skill necessary to be aninternationalthreat to banks and corporations. Asia
particularly draws cybercriminals’ attention. Dutch-Bangla Bank is not the first
Silence’s victim in the region. In total, we are aware of at least 4targets Silence
has attacked in Asia recently.”

About Silence
Silence is an active though very small group of Russian-speaking hackers.
Group-IB first detected the group’s activity in 2016. Over the course of their ‘work’,
Silence attacked bank management systems, card processing systems, and the
Russian interbank transfers system (AWS CBR). The gang’s targets are mainly
located in Russia, Ukraine, Belarus, Azerbaijan, Poland, and Kazakhstan,
although phishing emails were sent to bank employees in Central and Western
Europe, Africa, and Asia. Recently, Group-IB has detected Silence shifting their
focus from the CIS and neighbouring countries to international markets. The
report “Silence: Moving into the darkside” was published in September 2018 and
was the first to describe the group’s tactics and tools.

About Group-IB
Group-IB is a leading provider of solutions aimed at detection and prevention of
cyberattacks, online fraud, and IP protection. Group-IB’s Threat Intelligence
system has been named one of the best in class by Gartner, Forrester, and IDC.
Group-IB’s technological leadership is built on the company’s sixteen years of
hands-on experience in cybercrime investigations around the world and 55 000
hours of cyber security incident response accumulated in the largest forensic
laboratory in Eastern Europe and a round-the-clock center providing a rapid
response to cyber incidents—CERT-GIB. Group-IB is a partner of INTERPOL,
Europol, and has been recommended by the OSCE as a cybersecurity solutions
provider. Group-IB is a member of the World Economic Forum.

In Bangladesh Group-IB is working with Dhaka Distributions to protect local
customers against most advanced cybercriminal groups. Dhaka Distributions
current and potential customers have opportunity to enhance their cybersecurity
capabilities with Group-IB’s Threat Detection System for adversary-centric
detection and proactive threat hunting, powered by Group-IB Threat Intelligence
which is a unique source of tailored, actionable and reliable data on threat actors
and major types of malware used by cybercriminals.

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