Analysis
- max time kernel
178s - max time network
181s - platform
windows10-2004_x64 - resource
win10v2004-20220812-en - resource tags
- submitted
04/10/2022, 03:40
General
- Target file.exe
- Size 264KB
- Sample221004-d77tlabba3
- SHA256 afca0678fcbcee18ce6bb76c7730bfae9b41cb34ba019ef8e8cff03d3e2aa970
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 3 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.
- Modifies system certificate store 2 TTPs 2 IoCs
- 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\58BF.dll1⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\regsvr32.exe/s C:\Users\Admin\AppData\Local\Temp\58BF.dll2⤵
- Loads dropped DLL
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C:\Users\Admin\AppData\Local\Temp\5A27.exeC:\Users\Admin\AppData\Local\Temp\5A27.exe1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\5A27.exeC:\Users\Admin\AppData\Local\Temp\5A27.exe2⤵
- Executes dropped EXE
- Checks computer location settings
- Adds Run key to start application
- Modifies system certificate store
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\icacls.exeicacls "C:\Users\Admin\AppData\Local\2f573b6e-37b1-4b95-9df8-9954da793ea9" /deny *S-1-1-0:(OI)(CI)(DE,DC)3⤵
- Modifies file permissions
-
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C:\Users\Admin\AppData\Local\Temp\5A27.exe"C:\Users\Admin\AppData\Local\Temp\5A27.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\5A27.exe"C:\Users\Admin\AppData\Local\Temp\5A27.exe" --Admin IsNotAutoStart IsNotTask4⤵
- Executes dropped EXE
- Checks computer location settings
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\aa92695f-1b2f-435c-b18c-8e38adc88019\build2.exe"C:\Users\Admin\AppData\Local\aa92695f-1b2f-435c-b18c-8e38adc88019\build2.exe"5⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
-
C:\Users\Admin\AppData\Local\aa92695f-1b2f-435c-b18c-8e38adc88019\build2.exe"C:\Users\Admin\AppData\Local\aa92695f-1b2f-435c-b18c-8e38adc88019\build2.exe"6⤵
- Executes dropped EXE
- Loads dropped DLL
- Checks processor information in registry
-
-
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C:\Users\Admin\AppData\Local\aa92695f-1b2f-435c-b18c-8e38adc88019\build3.exe"C:\Users\Admin\AppData\Local\aa92695f-1b2f-435c-b18c-8e38adc88019\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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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
07CEF2F654E3ED6050FFC9B6EB844250_3431D4C539FB2CFCB781821E9902850D
B2FAF7692FD9FFBD64EDE317E42334BA_D7393C8F62BDE4D4CB606228BC7A711E
07CEF2F654E3ED6050FFC9B6EB844250_3431D4C539FB2CFCB781821E9902850D
B2FAF7692FD9FFBD64EDE317E42334BA_D7393C8F62BDE4D4CB606228BC7A711E
5A27.exe
58BF.dll
58BF.dll
5A27.exe
5A27.exe
5A27.exe
5A27.exe
5A27.exe
build2.exe
build2.exe
build2.exe
build3.exe
build3.exe
mstsca.exe
mstsca.exe
memory/624-174-0x0000000002209000-0x000000000229B000-memory.dmp
memory/692-157-0x0000000002F10000-0x0000000003010000-memory.dmp
memory/692-154-0x00000000030D0000-0x0000000003179000-memory.dmp
memory/692-153-0x0000000003010000-0x00000000030CE000-memory.dmp
memory/692-152-0x0000000002F10000-0x0000000003010000-memory.dmp
memory/692-151-0x0000000002D00000-0x0000000002E04000-memory.dmp
memory/1604-177-0x0000000000400000-0x0000000000537000-memory.dmp
memory/1604-175-0x0000000000400000-0x0000000000537000-memory.dmp
memory/1604-173-0x0000000000400000-0x0000000000537000-memory.dmp
memory/1604-217-0x0000000000400000-0x0000000000537000-memory.dmp
memory/2152-169-0x0000000000D40000-0x0000000000DAB000-memory.dmp
memory/2152-162-0x0000000000D40000-0x0000000000DAB000-memory.dmp
memory/2152-161-0x0000000001000000-0x0000000001075000-memory.dmp
memory/3064-221-0x0000000000400000-0x000000000045E000-memory.dmp
memory/3064-197-0x0000000061E00000-0x0000000061EF3000-memory.dmp
memory/3064-196-0x0000000000400000-0x000000000045E000-memory.dmp
memory/3064-195-0x0000000000400000-0x000000000045E000-memory.dmp
memory/3064-190-0x0000000000400000-0x000000000045E000-memory.dmp
memory/3192-194-0x0000000000650000-0x000000000069A000-memory.dmp
memory/3192-193-0x00000000006EE000-0x000000000071A000-memory.dmp
memory/3288-133-0x0000000000590000-0x0000000000599000-memory.dmp
memory/3288-134-0x0000000000400000-0x0000000000448000-memory.dmp
memory/3288-135-0x0000000000400000-0x0000000000448000-memory.dmp
memory/3288-132-0x000000000077C000-0x000000000078C000-memory.dmp
memory/3464-144-0x0000000000400000-0x0000000000537000-memory.dmp
memory/3464-149-0x0000000000400000-0x0000000000537000-memory.dmp
memory/3464-168-0x0000000000400000-0x0000000000537000-memory.dmp
memory/3464-147-0x0000000000400000-0x0000000000537000-memory.dmp
memory/3464-150-0x0000000000400000-0x0000000000537000-memory.dmp
memory/3500-165-0x0000000000BF0000-0x0000000000BFC000-memory.dmp
memory/3500-164-0x0000000000E80000-0x0000000000E87000-memory.dmp
memory/4280-148-0x0000000002350000-0x000000000246B000-memory.dmp
memory/4280-146-0x00000000008EE000-0x0000000000980000-memory.dmp