Analysis
- max time kernel
153s - max time network
161s - platform
windows10-2004_x64 - resource
win10v2004-20220812-en - resource tags
- submitted
04/10/2022, 12:02
General
- Target file.exe
- Size 265KB
- Sample221004-n7fefsagh8
- SHA256 6e238c048c0abb166fdde310f0c3ab7a8c1aa8376cb7bca00bb998209ab23798
Malware Config
Extracted
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djvu
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http://winnlinne.com/lancer/get.php
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extension
.adww
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offline_id
z8lhl4oForVEc7gy9Ra8rSqjYMl3xiFRuIW4not1
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payload_url
http://rgyui.top/dl/build2.exe
http://winnlinne.com/files/1/build3.exe
-
ransomnote
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Extracted
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vidar
-
54.9
-
517
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https://t.me/larsenup
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https://ioc.exchange/@zebra54
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profile_id
517
Signatures
- Detected Djvu ransomware 10 IoCs
- Detects Smokeloader packer 1 IoCs
- Djvu Ransomware
Ransomware which is a variant of the STOP family.
- SmokeLoader
Modular backdoor trojan in use since 2014.
- Vidar
Vidar is an infostealer based on Arkei stealer.
- Downloads MZ/PE file
- Executes dropped EXE 8 IoCs
- Checks computer location settings 2 TTPs 2 IoCs
Looks up country code configured in the registry, likely geofence.
- Loads dropped DLL 3 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 Microsoft Outlook profiles 1 TTPs 3 IoCs
- 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 SCSI registry key(s) 3 TTPs 3 IoCs
SCSI information is often read in order to detect sandboxing environments.
- 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.
- Suspicious behavior: EnumeratesProcesses 64 IoCs
- Suspicious behavior: GetForegroundWindowSpam 1 IoCs
- Suspicious behavior: MapViewOfSection 5 IoCs
- Suspicious use of AdjustPrivilegeToken 10 IoCs
- Suspicious use of WriteProcessMemory 62 IoCs
- outlook_office_path 1 IoCs
- outlook_win_path 1 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\file.exe"C:\Users\Admin\AppData\Local\Temp\file.exe"1⤵
- Checks SCSI registry key(s)
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
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C:\Users\Admin\AppData\Local\Temp\A9EC.exeC:\Users\Admin\AppData\Local\Temp\A9EC.exe1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\A9EC.exeC:\Users\Admin\AppData\Local\Temp\A9EC.exe2⤵
- Executes dropped EXE
- Checks computer location settings
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\icacls.exeicacls "C:\Users\Admin\AppData\Local\e717b6ed-f0d1-4ad6-af13-928fd4e2437e" /deny *S-1-1-0:(OI)(CI)(DE,DC)3⤵
- Modifies file permissions
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C:\Users\Admin\AppData\Local\Temp\A9EC.exe"C:\Users\Admin\AppData\Local\Temp\A9EC.exe" --Admin IsNotAutoStart IsNotTask3⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
-
C:\Users\Admin\AppData\Local\Temp\A9EC.exe"C:\Users\Admin\AppData\Local\Temp\A9EC.exe" --Admin IsNotAutoStart IsNotTask4⤵
- Executes dropped EXE
- Checks computer location settings
- Suspicious use of WriteProcessMemory
-
C:\Users\Admin\AppData\Local\50df35c3-4c29-45e4-a13f-a7937e2d7352\build2.exe"C:\Users\Admin\AppData\Local\50df35c3-4c29-45e4-a13f-a7937e2d7352\build2.exe"5⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
-
C:\Users\Admin\AppData\Local\50df35c3-4c29-45e4-a13f-a7937e2d7352\build2.exe"C:\Users\Admin\AppData\Local\50df35c3-4c29-45e4-a13f-a7937e2d7352\build2.exe"6⤵
- Executes dropped EXE
- Loads dropped DLL
- Checks processor information in registry
-
-
-
C:\Users\Admin\AppData\Local\50df35c3-4c29-45e4-a13f-a7937e2d7352\build3.exe"C:\Users\Admin\AppData\Local\50df35c3-4c29-45e4-a13f-a7937e2d7352\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:\Windows\system32\regsvr32.exeregsvr32 /s C:\Users\Admin\AppData\Local\Temp\AD48.dll1⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\regsvr32.exe/s C:\Users\Admin\AppData\Local\Temp\AD48.dll2⤵
- Loads dropped DLL
-
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C:\Windows\SysWOW64\explorer.exeC:\Windows\SysWOW64\explorer.exe1⤵
- Accesses Microsoft Outlook profiles
- outlook_office_path
- outlook_win_path
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C:\Windows\explorer.exeC:\Windows\explorer.exe1⤵
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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
build2.exe
build2.exe
build2.exe
build3.exe
build3.exe
A9EC.exe
A9EC.exe
A9EC.exe
A9EC.exe
A9EC.exe
AD48.dll
AD48.dll
A9EC.exe
mstsca.exe
mstsca.exe
memory/1248-175-0x0000000000400000-0x0000000000537000-memory.dmp
memory/1248-174-0x0000000000400000-0x0000000000537000-memory.dmp
memory/1248-178-0x0000000000400000-0x0000000000537000-memory.dmp
memory/1248-182-0x0000000000400000-0x0000000000537000-memory.dmp
memory/2040-134-0x0000000000520000-0x0000000000529000-memory.dmp
memory/2040-133-0x000000000056C000-0x000000000057C000-memory.dmp
memory/2040-135-0x0000000000400000-0x0000000000448000-memory.dmp
memory/2040-136-0x000000000056C000-0x000000000057C000-memory.dmp
memory/2040-132-0x000000000056C000-0x000000000057C000-memory.dmp
memory/2040-137-0x0000000000400000-0x0000000000448000-memory.dmp
memory/2356-152-0x0000000000400000-0x0000000000537000-memory.dmp
memory/2356-169-0x0000000000400000-0x0000000000537000-memory.dmp
memory/2356-149-0x0000000000400000-0x0000000000537000-memory.dmp
memory/2356-145-0x0000000000400000-0x0000000000537000-memory.dmp
memory/2356-143-0x0000000000400000-0x0000000000537000-memory.dmp
memory/2720-189-0x0000000000710000-0x000000000075A000-memory.dmp
memory/2720-187-0x00000000007AE000-0x00000000007D9000-memory.dmp
memory/3392-147-0x00000000007BF000-0x0000000000851000-memory.dmp
memory/3392-150-0x0000000002300000-0x000000000241B000-memory.dmp
memory/3648-166-0x0000000000810000-0x000000000087B000-memory.dmp
memory/3648-170-0x0000000000810000-0x000000000087B000-memory.dmp
memory/3648-165-0x0000000000880000-0x00000000008F5000-memory.dmp
memory/3660-164-0x0000000000AF0000-0x0000000000AFC000-memory.dmp
memory/3932-190-0x0000000000400000-0x000000000045E000-memory.dmp
memory/3932-195-0x0000000061E00000-0x0000000061EF3000-memory.dmp
memory/3932-188-0x0000000000400000-0x000000000045E000-memory.dmp
memory/3932-184-0x0000000000400000-0x000000000045E000-memory.dmp
memory/4208-176-0x000000000227B000-0x000000000230D000-memory.dmp
memory/5056-156-0x00000000036F0000-0x00000000037A1000-memory.dmp
memory/5056-154-0x0000000003520000-0x000000000360F000-memory.dmp
memory/5056-153-0x0000000003330000-0x0000000003424000-memory.dmp
memory/5056-155-0x0000000003610000-0x00000000036D8000-memory.dmp
memory/5056-159-0x0000000003520000-0x000000000360F000-memory.dmp