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@ESETresearch

Nov 23

@LukasStefanko

#ESETresearch discovered an active #Android campaign conducted by the hack-for-hire group #Bahamut. The campaign has been active since January 2022, with malicious apps are distributed through a fake #SecureVPN website
@LukasStefanko welivesecurity.com/2022/11/23/bah… 1/6

@malwrhunterteam

We discovered at least 8 versions of the spyware, all trojanized versions of legitimate VPN apps SoftVPN and OpenVPN; none have been available on Google Play. The fake SoftVPN triggered our YARA rules; we also got a DM from @malwrhunterteam about the sample. TY folks!
2/6

The fake website was registered on 2022-01-27 and created based on a free web template. It was most likely used by the threat actor as an inspiration, as it required only small changes and looks trustworthy.
3/6

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ESET research

@ESETresearch

Nov 9

@smolar_m

#ESETResearch discovered and reported to the manufacturer 3 vulnerabilities in the #UEFI firmware of several Lenovo Notebooks. The vulnerabilities allow disabling UEFI Secure Boot or restoring factory default Secure Boot databases (incl. dbx): all simply from an OS. @smolar_m 1/9

Reported vulnerabilities – #CVE-2022-3430, #CVE-2022-3431, and #CVE-2022-3432 – affect various Lenovo Yoga, IdeaPad and ThinkBook devices. All affected devices with an active development support have been fixed after we reported them to the manufacturer. 2/9

@eclypsium

While disabling UEFI Secure Boot allows direct execution of unsigned UEFI apps, restoring factory default dbx enables the use of known vulnerable bootloaders (e.g., #CVE-2022-34301 found by @eclypsium) to bypass Secure Boot, while keeping it enabled.
eclypsium.com/2022/08/11/vul… 3/9

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ESET research

@ESETresearch

Oct 12

#Emotet’s operators were busy updating their systeminfo module, with changes that enable malware operators to improve the targeting of specific victims and distinguish tracking bots from real users. #ESETresearch 1/7

The operators completely changed the attributes that are collected and sent to the attacker’s C&Cs. The new list includes processor brand, size of physical memory in MB and an approximate % of it being in use. 2/7

The magic number – used by the server to verify that the systeminfo module is up to date – is obtained in a different way too. Instead of being part of the main function, 64 functions are used, with the module selecting one that returns the correct value. 3/7

Read 7 tweets

ESET research

@ESETresearch

Oct 11

#ESETresearch reveals new findings about POLONIUM, an APT group that has targeted more than a dozen organizations in Israel 🇮🇱 since at least September 2021, using at least seven different custom backdoors.
welivesecurity.com/2022/10/11/pol…
1/6

Five of the seven described #POLONIUM backdoors were previously undocumented. At the time of writing our blogpost, the latest one (PapaCreep) was still being used. It is also the first one not written in C# or PowerShell. 2/6

Interestingly, the commands of the FlipCreep backdoor do exactly the opposite of what’s expected. We don’t know if this was a mistake, but UPLOAD actually downloads files from the FTP server to the victim, and DOWNLOAD uploads files. 3/6

Read 6 tweets

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@ESETresearch

Sep 30

@pkalnai

#ESETresearch has discovered #Lazarus attacks against targets in 🇳🇱 and 🇧🇪, spreading via spearphishing emails and exploiting the CVE-2021-21551 vulnerability to disable the monitoring of all security solutions on compromised machines @pkalnai welivesecurity.com/2022/09/30/ama…

@pkalnai

@pkalnai The attack started with spearphishing emails connected to fake job offers, targeting an aerospace company in the Netherlands, and a political journalist in Belgium. The attackers then deployed a VMProtect-ed version of #BLINDINGCAN, a fully featured HTTP(S) backdoor. 2/6

@pkalnai

@pkalnai Notably, the attackers used a rootkit named FudModule.dll, that modifies kernel variables and removes kernel callbacks to disable monitoring of all security solutions on the system. This is the first recorded abuse of the CVE-2021-21551 vulnerability in Dell DBUtil drivers. 3/6

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@ESETresearch

Sep 28

@marc_etienne_

In July, #ESETresearch reported on macOS spyware we dubbed CloudMensis. In the blogpost, we left the malware unattributed. However, further analysis showed similarities with a Windows malware called #RokRAT, a #ScarCruft tool. @marc_etienne_, @pkalnai 1/9

https://twitter.com/ESETresearch/status/1549329017853067264

The Windows and macOS malware variants are not copycats of each other, but share the following similarities: ➡️ 2/9

1️⃣ Both variants are spyware with functionality such as keylogging and taking screenshots. Each supported command is identified by a number. Its value is in a similar range for both: macOS has 39 commands ranging from 49 to 93, while Windows has 42, ranging from 48 to 90. 3/9

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