Analysis
- max time kernel
152s - max time network
144s - platform
windows10-2004_x64 - resource
win10v2004-20220901-en - resource tags
- submitted
04/10/2022, 01:02
General
- Target file.exe
- Size 264KB
- Sample221004-bdsfpseha3
- SHA256 8adf022564cc5a42d03fdb01a96fafe0bb61369edec04e1bca1fc4d41a402265
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
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ransomnote
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Extracted
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vidar
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54.9
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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:\Windows\system32\regsvr32.exeregsvr32 /s C:\Users\Admin\AppData\Local\Temp\EC5.dll1⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\regsvr32.exe/s C:\Users\Admin\AppData\Local\Temp\EC5.dll2⤵
- Loads dropped DLL
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C:\Users\Admin\AppData\Local\Temp\101E.exeC:\Users\Admin\AppData\Local\Temp\101E.exe1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\101E.exeC:\Users\Admin\AppData\Local\Temp\101E.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\9ff17d6a-32b7-4ed1-9cc4-110da5afc6da" /deny *S-1-1-0:(OI)(CI)(DE,DC)3⤵
- Modifies file permissions
-
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C:\Users\Admin\AppData\Local\Temp\101E.exe"C:\Users\Admin\AppData\Local\Temp\101E.exe" --Admin IsNotAutoStart IsNotTask3⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\101E.exe"C:\Users\Admin\AppData\Local\Temp\101E.exe" --Admin IsNotAutoStart IsNotTask4⤵
- Executes dropped EXE
- Checks computer location settings
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\54802284-ed4b-4ccc-8041-4118b297734c\build2.exe"C:\Users\Admin\AppData\Local\54802284-ed4b-4ccc-8041-4118b297734c\build2.exe"5⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\54802284-ed4b-4ccc-8041-4118b297734c\build2.exe"C:\Users\Admin\AppData\Local\54802284-ed4b-4ccc-8041-4118b297734c\build2.exe"6⤵
- Executes dropped EXE
- Loads dropped DLL
- Checks processor information in registry
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-
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C:\Users\Admin\AppData\Local\54802284-ed4b-4ccc-8041-4118b297734c\build3.exe"C:\Users\Admin\AppData\Local\54802284-ed4b-4ccc-8041-4118b297734c\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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-
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-
-
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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
101E.exe
101E.exe
101E.exe
101E.exe
101E.exe
101E.exe
EC5.dll
EC5.dll
mstsca.exe
mstsca.exe
memory/536-132-0x000000000081C000-0x000000000082D000-memory.dmp
memory/536-135-0x0000000000400000-0x0000000000448000-memory.dmp
memory/536-134-0x0000000000400000-0x0000000000448000-memory.dmp
memory/536-133-0x00000000007E0000-0x00000000007E9000-memory.dmp
memory/860-144-0x0000000000400000-0x0000000000537000-memory.dmp
memory/860-150-0x0000000000400000-0x0000000000537000-memory.dmp
memory/860-149-0x0000000000400000-0x0000000000537000-memory.dmp
memory/860-167-0x0000000000400000-0x0000000000537000-memory.dmp
memory/860-146-0x0000000000400000-0x0000000000537000-memory.dmp
memory/1192-159-0x0000000001600000-0x0000000001675000-memory.dmp
memory/1192-161-0x0000000001330000-0x000000000139B000-memory.dmp
memory/1200-148-0x0000000002360000-0x000000000247B000-memory.dmp
memory/1200-147-0x00000000022CC000-0x000000000235E000-memory.dmp
memory/1796-172-0x0000000002261000-0x00000000022F3000-memory.dmp
memory/2064-184-0x0000000000610000-0x000000000065A000-memory.dmp
memory/2064-182-0x000000000072D000-0x0000000000759000-memory.dmp
memory/2156-171-0x0000000000400000-0x0000000000537000-memory.dmp
memory/2156-173-0x0000000000400000-0x0000000000537000-memory.dmp
memory/2156-174-0x0000000000400000-0x0000000000537000-memory.dmp
memory/2156-210-0x0000000000400000-0x0000000000537000-memory.dmp
memory/2248-183-0x0000000000400000-0x000000000045E000-memory.dmp
memory/2248-185-0x0000000000400000-0x000000000045E000-memory.dmp
memory/2248-211-0x0000000000400000-0x000000000045E000-memory.dmp
memory/2248-179-0x0000000000400000-0x000000000045E000-memory.dmp
memory/2248-190-0x0000000061E00000-0x0000000061EF3000-memory.dmp
memory/3276-162-0x0000000000C00000-0x0000000000C0C000-memory.dmp
memory/4696-157-0x0000000003160000-0x0000000003260000-memory.dmp
memory/4696-154-0x0000000003320000-0x00000000033C9000-memory.dmp
memory/4696-152-0x0000000003160000-0x0000000003260000-memory.dmp
memory/4696-151-0x0000000002F50000-0x0000000003054000-memory.dmp
memory/4696-153-0x0000000003260000-0x000000000331E000-memory.dmp