Analysis
- max time kernel
159s - max time network
167s - platform
windows10-2004_x64 - resource
win10v2004-20220812-en - resource tags
- submitted
06/12/2022, 12:30
General
- Target b165a08d33d24df99378a2a35d50570cfeb433765f46f6b45346027ce20df042.exe
- Size 878KB
- Sample221206-ppk3naca5x
- SHA256 b165a08d33d24df99378a2a35d50570cfeb433765f46f6b45346027ce20df042
Malware Config
Extracted
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djvu
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http://fresherlights.com/test1/get.php
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extension
.mppn
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offline_id
d1BN9KEra4Hetg5GUH0nQZqy14sntD2NbihzGQt1
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payload_url
http://uaery.top/dl/build2.exe
http://fresherlights.com/files/1/build3.exe
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ransomnote
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Extracted
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vidar
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56.1
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517
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https://t.me/dishasta
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https://steamcommunity.com/profiles/76561199441933804
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profile_id
517
Signatures
- Detected Djvu ransomware 9 IoCs
- Djvu Ransomware
Ransomware which is a variant of the STOP family.
- Vidar
Vidar is an infostealer based on Arkei stealer.
- Downloads MZ/PE file
- Executes dropped EXE 3 IoCs
- Checks computer location settings 2 TTPs 3 IoCs
Looks up country code configured in the registry, likely geofence.
- Loads dropped DLL 2 IoCs
- Modifies file permissions 1 TTPs 1 IoCs
- Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
- Accesses 2FA software files, possible credential harvesting 2 TTPs
- Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
- Adds Run key to start application 2 TTPs 1 IoCs
- Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
- Looks up external IP address via web service 2 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
- Suspicious use of SetThreadContext 3 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
- Checks processor information in registry 2 TTPs 2 IoCs
Processor information is often read in order to detect sandboxing environments.
- Creates scheduled task(s) 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
- Delays execution with timeout.exe 1 IoCs
- Suspicious behavior: EnumeratesProcesses 6 IoCs
- Suspicious use of WriteProcessMemory 50 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\b165a08d33d24df99378a2a35d50570cfeb433765f46f6b45346027ce20df042.exe"C:\Users\Admin\AppData\Local\Temp\b165a08d33d24df99378a2a35d50570cfeb433765f46f6b45346027ce20df042.exe"1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\b165a08d33d24df99378a2a35d50570cfeb433765f46f6b45346027ce20df042.exe"C:\Users\Admin\AppData\Local\Temp\b165a08d33d24df99378a2a35d50570cfeb433765f46f6b45346027ce20df042.exe"2⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\icacls.exeicacls "C:\Users\Admin\AppData\Local\3b8912a2-d7f9-4c4c-b0b1-98fd9b697f66" /deny *S-1-1-0:(OI)(CI)(DE,DC)3⤵
- Modifies file permissions
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C:\Users\Admin\AppData\Local\Temp\b165a08d33d24df99378a2a35d50570cfeb433765f46f6b45346027ce20df042.exe"C:\Users\Admin\AppData\Local\Temp\b165a08d33d24df99378a2a35d50570cfeb433765f46f6b45346027ce20df042.exe" --Admin IsNotAutoStart IsNotTask3⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\b165a08d33d24df99378a2a35d50570cfeb433765f46f6b45346027ce20df042.exe"C:\Users\Admin\AppData\Local\Temp\b165a08d33d24df99378a2a35d50570cfeb433765f46f6b45346027ce20df042.exe" --Admin IsNotAutoStart IsNotTask4⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\a73d5d4f-e1ab-497a-bdce-197e162b4997\build2.exe"C:\Users\Admin\AppData\Local\a73d5d4f-e1ab-497a-bdce-197e162b4997\build2.exe"5⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\a73d5d4f-e1ab-497a-bdce-197e162b4997\build2.exe"C:\Users\Admin\AppData\Local\a73d5d4f-e1ab-497a-bdce-197e162b4997\build2.exe"6⤵
- Executes dropped EXE
- Checks computer location settings
- Loads dropped DLL
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c timeout /t 6 & del /f /q "C:\Users\Admin\AppData\Local\a73d5d4f-e1ab-497a-bdce-197e162b4997\build2.exe" & exit7⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\timeout.exetimeout /t 68⤵
- Delays execution with timeout.exe
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C:\Users\Admin\AppData\Local\a73d5d4f-e1ab-497a-bdce-197e162b4997\build3.exe"C:\Users\Admin\AppData\Local\a73d5d4f-e1ab-497a-bdce-197e162b4997\build3.exe"5⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\schtasks.exe/C /create /F /sc minute /mo 1 /tn "Azure-Update-Task" /tr "C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe"6⤵
- Creates scheduled task(s)
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C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exeC:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe1⤵
Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
mozglue.dll
nss3.dll
b165a08d33d24df99378a2a35d50570cfeb433765f46f6b45346027ce20df042.exe
build2.exe
build2.exe
build2.exe
build3.exe
build3.exe
memory/548-146-0x000000000076C000-0x00000000007FD000-memory.dmp
memory/832-156-0x0000000000400000-0x000000000045F000-memory.dmp
memory/832-153-0x0000000000400000-0x000000000045F000-memory.dmp
memory/832-182-0x0000000000400000-0x000000000045F000-memory.dmp
memory/832-157-0x0000000000400000-0x000000000045F000-memory.dmp
memory/832-160-0x0000000060900000-0x0000000060992000-memory.dmp
memory/832-159-0x0000000000400000-0x000000000045F000-memory.dmp
memory/2204-134-0x0000000000400000-0x0000000000537000-memory.dmp
memory/2204-138-0x0000000000400000-0x0000000000537000-memory.dmp
memory/2204-136-0x0000000000400000-0x0000000000537000-memory.dmp
memory/2204-133-0x0000000000400000-0x0000000000537000-memory.dmp
memory/2204-142-0x0000000000400000-0x0000000000537000-memory.dmp
memory/2712-158-0x0000000000550000-0x000000000059B000-memory.dmp
memory/2712-155-0x0000000000692000-0x00000000006BE000-memory.dmp
memory/3120-137-0x0000000000960000-0x0000000000A7B000-memory.dmp
memory/3120-135-0x00000000005C3000-0x0000000000654000-memory.dmp
memory/4756-148-0x0000000000400000-0x0000000000537000-memory.dmp
memory/4756-147-0x0000000000400000-0x0000000000537000-memory.dmp
memory/4756-145-0x0000000000400000-0x0000000000537000-memory.dmp