Analysis
- max time kernel
86s - max time network
149s - platform
windows10-2004_x64 - resource
win10v2004-20221111-en - resource tags
- submitted
16/02/2023, 14:05
General
- Target b555c0d2d026f5c33f8bf457c9bd876630305b15391c0d297415eaeb58581ea6.exe
- Size 752KB
- Sample230216-rd8exshe2v
- SHA256 b555c0d2d026f5c33f8bf457c9bd876630305b15391c0d297415eaeb58581ea6
Malware Config
Extracted
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djvu
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http://bihsy.com/test1/get.php
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extension
.hhmm
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offline_id
dMMXkgwQTycP13C5xwPbHDSzhx1ZxiPgIMZXewt1
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payload_url
http://uaery.top/dl/build2.exe
http://bihsy.com/files/1/build3.exe
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ransomnote
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Extracted
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vidar
-
2.5
-
19
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profile_id
19
Signatures
- Detected Djvu ransomware 10 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
- Checks computer location settings 2 TTPs 3 IoCs
Looks up country code configured in the registry, likely geofence.
- Executes dropped EXE 4 IoCs
- 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 2 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 53 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\b555c0d2d026f5c33f8bf457c9bd876630305b15391c0d297415eaeb58581ea6.exe"C:\Users\Admin\AppData\Local\Temp\b555c0d2d026f5c33f8bf457c9bd876630305b15391c0d297415eaeb58581ea6.exe"1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\b555c0d2d026f5c33f8bf457c9bd876630305b15391c0d297415eaeb58581ea6.exe"C:\Users\Admin\AppData\Local\Temp\b555c0d2d026f5c33f8bf457c9bd876630305b15391c0d297415eaeb58581ea6.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\00c41ccf-7b35-450e-bb41-0ccd9e679e1a" /deny *S-1-1-0:(OI)(CI)(DE,DC)3⤵
- Modifies file permissions
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C:\Users\Admin\AppData\Local\Temp\b555c0d2d026f5c33f8bf457c9bd876630305b15391c0d297415eaeb58581ea6.exe"C:\Users\Admin\AppData\Local\Temp\b555c0d2d026f5c33f8bf457c9bd876630305b15391c0d297415eaeb58581ea6.exe" --Admin IsNotAutoStart IsNotTask3⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\b555c0d2d026f5c33f8bf457c9bd876630305b15391c0d297415eaeb58581ea6.exe"C:\Users\Admin\AppData\Local\Temp\b555c0d2d026f5c33f8bf457c9bd876630305b15391c0d297415eaeb58581ea6.exe" --Admin IsNotAutoStart IsNotTask4⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\57c9331a-847f-4d37-ba8e-0e8f8f7ba452\build2.exe"C:\Users\Admin\AppData\Local\57c9331a-847f-4d37-ba8e-0e8f8f7ba452\build2.exe"5⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\57c9331a-847f-4d37-ba8e-0e8f8f7ba452\build2.exe"C:\Users\Admin\AppData\Local\57c9331a-847f-4d37-ba8e-0e8f8f7ba452\build2.exe"6⤵
- Checks computer location settings
- Executes dropped EXE
- 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\57c9331a-847f-4d37-ba8e-0e8f8f7ba452\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\57c9331a-847f-4d37-ba8e-0e8f8f7ba452\build3.exe"C:\Users\Admin\AppData\Local\57c9331a-847f-4d37-ba8e-0e8f8f7ba452\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⤵
- 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"2⤵
- Creates scheduled task(s)
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
mozglue.dll
nss3.dll
b555c0d2d026f5c33f8bf457c9bd876630305b15391c0d297415eaeb58581ea6.exe
build2.exe
build2.exe
build2.exe
build3.exe
build3.exe
mstsca.exe
mstsca.exe
memory/1200-142-0x0000000000400000-0x0000000000537000-memory.dmp
memory/1200-133-0x0000000000400000-0x0000000000537000-memory.dmp
memory/1200-134-0x0000000000400000-0x0000000000537000-memory.dmp
memory/1200-136-0x0000000000400000-0x0000000000537000-memory.dmp
memory/1200-138-0x0000000000400000-0x0000000000537000-memory.dmp
memory/2444-135-0x0000000002406000-0x0000000002497000-memory.dmp
memory/2444-137-0x00000000024A0000-0x00000000025BB000-memory.dmp
memory/2600-161-0x0000000000718000-0x000000000074C000-memory.dmp
memory/2600-162-0x00000000021E0000-0x000000000223E000-memory.dmp
memory/3076-159-0x0000000000400000-0x0000000000472000-memory.dmp
memory/3076-185-0x0000000000400000-0x0000000000472000-memory.dmp
memory/3076-160-0x0000000000400000-0x0000000000472000-memory.dmp
memory/3076-157-0x0000000000400000-0x0000000000472000-memory.dmp
memory/3076-163-0x0000000000400000-0x0000000000472000-memory.dmp
memory/3076-164-0x0000000050C10000-0x0000000050D03000-memory.dmp
memory/4020-146-0x000000000231C000-0x00000000023AD000-memory.dmp
memory/4468-147-0x0000000000400000-0x0000000000537000-memory.dmp
memory/4468-148-0x0000000000400000-0x0000000000537000-memory.dmp
memory/4468-187-0x0000000000400000-0x0000000000537000-memory.dmp
memory/4468-145-0x0000000000400000-0x0000000000537000-memory.dmp