Analysis
- max time kernel
144s - max time network
132s - platform
windows10_x64 - resource
win10v20210408 - submitted
06/09/2021, 12:38
Static task
static1
Behavioral task
behavioral1
Sample
b32b5befec6b3ede50cbbe5b87a59fb1.exe
Resource
win7-en
Behavioral task
behavioral2
Sample
b32b5befec6b3ede50cbbe5b87a59fb1.exe
Resource
win10v20210408
General
- Target b32b5befec6b3ede50cbbe5b87a59fb1.exe
- Size 771KB
- Sample210906-pt342aecap
- SHA256 ff203304aa7c6a409238e18665fb19c26acebaaff5ad0c246f23abecd5aa17c8
- MD5 b32b5befec6b3ede50cbbe5b87a59fb1
- SHA1 132a426a3320eca43e975d780f84a96c47e529ad
- SHA512 f8497913c99d0e77ceb9cc6679b99b35ea38960af86802cd997a7a72b541b605b70b0522db421016702d480a02642136157374f879a429c52d491fd86083e8a8
- MD5 SHA1 SHA512
Malware Config
Extracted
-
vidar
-
40.4
-
517
-
https://romkaxarit.tumblr.com/
-
profile_id
517
Signatures
- Detected Djvu ransomeware 6 IoCs
resource yara_rule behavioral2/memory/3920-115-0x0000000000424141-mapping.dmp family_djvu behavioral2/memory/3920-114-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/860-116-0x0000000002370000-0x000000000248B000-memory.dmp family_djvu behavioral2/memory/3920-117-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/2984-122-0x0000000000424141-mapping.dmp family_djvu behavioral2/memory/2984-123-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu - Djvu Ransomware
Ransomware which is a variant of the STOP family.
- suricata: ET MALWARE Potential Dridex.Maldoc Minimal Executable Request
suricata: ET MALWARE Potential Dridex.Maldoc Minimal Executable Request
- suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt)
suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt)
- suricata: ET MALWARE Vidar/Arkei Stealer Client Data Upload
suricata: ET MALWARE Vidar/Arkei Stealer Client Data Upload
- suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer Data Exfil
suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer Data Exfil
- Vidar Stealer 7 IoCs
resource yara_rule behavioral2/memory/3844-134-0x0000000000400000-0x00000000004D7000-memory.dmp family_vidar behavioral2/memory/3844-135-0x000000000049ECBD-mapping.dmp family_vidar behavioral2/memory/4000-141-0x0000000004830000-0x0000000004903000-memory.dmp family_vidar behavioral2/memory/3844-142-0x0000000000400000-0x00000000004D7000-memory.dmp family_vidar behavioral2/memory/936-156-0x0000000003250000-0x000000000339A000-memory.dmp family_vidar behavioral2/memory/744-167-0x0000000003250000-0x000000000339A000-memory.dmp family_vidar behavioral2/memory/3688-172-0x0000000003330000-0x000000000347A000-memory.dmp family_vidar - Downloads MZ/PE file
- Executes dropped EXE 10 IoCs
pid Process 4000 build2.exe 1712 build3.exe 3844 build2.exe 2164 build3.exe 936 mstsca.exe 2284 mstsca.exe 744 mstsca.exe 3956 mstsca.exe 3688 mstsca.exe 636 mstsca.exe - Loads dropped DLL 2 IoCs
pid Process 3844 build2.exe 3844 build2.exe - Modifies file permissions 1 TTPs 1 IoCs
pid Process 3004 icacls.exe - Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
- Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
- Adds Run key to start application 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-1594587808-2047097707-2163810515-1000\Software\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\38e8c03e-6acb-414e-a50e-eb302038e538\\b32b5befec6b3ede50cbbe5b87a59fb1.exe\" --AutoStart" b32b5befec6b3ede50cbbe5b87a59fb1.exe - 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.
flow ioc 10 api.2ip.ua 11 api.2ip.ua 18 api.2ip.ua - Suspicious use of SetThreadContext 7 IoCs
description pid Process procid_target PID 860 set thread context of 3920 860 b32b5befec6b3ede50cbbe5b87a59fb1.exe 74 PID 2760 set thread context of 2984 2760 b32b5befec6b3ede50cbbe5b87a59fb1.exe 79 PID 4000 set thread context of 3844 4000 build2.exe 84 PID 1712 set thread context of 2164 1712 build3.exe 85 PID 936 set thread context of 2284 936 mstsca.exe 93 PID 744 set thread context of 3956 744 mstsca.exe 99 PID 3688 set thread context of 636 3688 mstsca.exe 101 - 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.
description ioc Process Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString build2.exe Key opened \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0 build2.exe - Creates scheduled task(s) 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
pid Process 3956 schtasks.exe 608 schtasks.exe - Delays execution with timeout.exe 1 IoCs
pid Process 680 timeout.exe - Kills process with taskkill 1 IoCs
pid Process 2848 taskkill.exe -
description ioc Process Set value (data) \REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\D1EB23A46D17D68FD92564C2F1F1601764D8E349\Blob = 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 b32b5befec6b3ede50cbbe5b87a59fb1.exe Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\D1EB23A46D17D68FD92564C2F1F1601764D8E349 b32b5befec6b3ede50cbbe5b87a59fb1.exe - Suspicious behavior: EnumeratesProcesses 12 IoCs
pid Process 3920 b32b5befec6b3ede50cbbe5b87a59fb1.exe 3920 b32b5befec6b3ede50cbbe5b87a59fb1.exe 2984 b32b5befec6b3ede50cbbe5b87a59fb1.exe 2984 b32b5befec6b3ede50cbbe5b87a59fb1.exe 3844 build2.exe 3844 build2.exe 3844 build2.exe 3844 build2.exe 3844 build2.exe 3844 build2.exe 3844 build2.exe 3844 build2.exe - Suspicious use of AdjustPrivilegeToken 1 IoCs
description pid Process Token: SeDebugPrivilege 2848 taskkill.exe - Suspicious use of WriteProcessMemory 64 IoCs
description pid Process procid_target PID 860 wrote to memory of 3920 860 b32b5befec6b3ede50cbbe5b87a59fb1.exe 74 PID 860 wrote to memory of 3920 860 b32b5befec6b3ede50cbbe5b87a59fb1.exe 74 PID 860 wrote to memory of 3920 860 b32b5befec6b3ede50cbbe5b87a59fb1.exe 74 PID 860 wrote to memory of 3920 860 b32b5befec6b3ede50cbbe5b87a59fb1.exe 74 PID 860 wrote to memory of 3920 860 b32b5befec6b3ede50cbbe5b87a59fb1.exe 74 PID 860 wrote to memory of 3920 860 b32b5befec6b3ede50cbbe5b87a59fb1.exe 74 PID 860 wrote to memory of 3920 860 b32b5befec6b3ede50cbbe5b87a59fb1.exe 74 PID 860 wrote to memory of 3920 860 b32b5befec6b3ede50cbbe5b87a59fb1.exe 74 PID 860 wrote to memory of 3920 860 b32b5befec6b3ede50cbbe5b87a59fb1.exe 74 PID 860 wrote to memory of 3920 860 b32b5befec6b3ede50cbbe5b87a59fb1.exe 74 PID 3920 wrote to memory of 3004 3920 b32b5befec6b3ede50cbbe5b87a59fb1.exe 76 PID 3920 wrote to memory of 3004 3920 b32b5befec6b3ede50cbbe5b87a59fb1.exe 76 PID 3920 wrote to memory of 3004 3920 b32b5befec6b3ede50cbbe5b87a59fb1.exe 76 PID 3920 wrote to memory of 2760 3920 b32b5befec6b3ede50cbbe5b87a59fb1.exe 77 PID 3920 wrote to memory of 2760 3920 b32b5befec6b3ede50cbbe5b87a59fb1.exe 77 PID 3920 wrote to memory of 2760 3920 b32b5befec6b3ede50cbbe5b87a59fb1.exe 77 PID 2760 wrote to memory of 2984 2760 b32b5befec6b3ede50cbbe5b87a59fb1.exe 79 PID 2760 wrote to memory of 2984 2760 b32b5befec6b3ede50cbbe5b87a59fb1.exe 79 PID 2760 wrote to memory of 2984 2760 b32b5befec6b3ede50cbbe5b87a59fb1.exe 79 PID 2760 wrote to memory of 2984 2760 b32b5befec6b3ede50cbbe5b87a59fb1.exe 79 PID 2760 wrote to memory of 2984 2760 b32b5befec6b3ede50cbbe5b87a59fb1.exe 79 PID 2760 wrote to memory of 2984 2760 b32b5befec6b3ede50cbbe5b87a59fb1.exe 79 PID 2760 wrote to memory of 2984 2760 b32b5befec6b3ede50cbbe5b87a59fb1.exe 79 PID 2760 wrote to memory of 2984 2760 b32b5befec6b3ede50cbbe5b87a59fb1.exe 79 PID 2760 wrote to memory of 2984 2760 b32b5befec6b3ede50cbbe5b87a59fb1.exe 79 PID 2760 wrote to memory of 2984 2760 b32b5befec6b3ede50cbbe5b87a59fb1.exe 79 PID 2984 wrote to memory of 4000 2984 b32b5befec6b3ede50cbbe5b87a59fb1.exe 82 PID 2984 wrote to memory of 4000 2984 b32b5befec6b3ede50cbbe5b87a59fb1.exe 82 PID 2984 wrote to memory of 4000 2984 b32b5befec6b3ede50cbbe5b87a59fb1.exe 82 PID 2984 wrote to memory of 1712 2984 b32b5befec6b3ede50cbbe5b87a59fb1.exe 83 PID 2984 wrote to memory of 1712 2984 b32b5befec6b3ede50cbbe5b87a59fb1.exe 83 PID 2984 wrote to memory of 1712 2984 b32b5befec6b3ede50cbbe5b87a59fb1.exe 83 PID 4000 wrote to memory of 3844 4000 build2.exe 84 PID 4000 wrote to memory of 3844 4000 build2.exe 84 PID 4000 wrote to memory of 3844 4000 build2.exe 84 PID 4000 wrote to memory of 3844 4000 build2.exe 84 PID 4000 wrote to memory of 3844 4000 build2.exe 84 PID 4000 wrote to memory of 3844 4000 build2.exe 84 PID 4000 wrote to memory of 3844 4000 build2.exe 84 PID 4000 wrote to memory of 3844 4000 build2.exe 84 PID 1712 wrote to memory of 2164 1712 build3.exe 85 PID 1712 wrote to memory of 2164 1712 build3.exe 85 PID 1712 wrote to memory of 2164 1712 build3.exe 85 PID 1712 wrote to memory of 2164 1712 build3.exe 85 PID 1712 wrote to memory of 2164 1712 build3.exe 85 PID 1712 wrote to memory of 2164 1712 build3.exe 85 PID 1712 wrote to memory of 2164 1712 build3.exe 85 PID 1712 wrote to memory of 2164 1712 build3.exe 85 PID 1712 wrote to memory of 2164 1712 build3.exe 85 PID 2164 wrote to memory of 3956 2164 build3.exe 86 PID 2164 wrote to memory of 3956 2164 build3.exe 86 PID 2164 wrote to memory of 3956 2164 build3.exe 86 PID 3844 wrote to memory of 2836 3844 build2.exe 90 PID 3844 wrote to memory of 2836 3844 build2.exe 90 PID 3844 wrote to memory of 2836 3844 build2.exe 90 PID 2836 wrote to memory of 2848 2836 cmd.exe 92 PID 2836 wrote to memory of 2848 2836 cmd.exe 92 PID 2836 wrote to memory of 2848 2836 cmd.exe 92 PID 936 wrote to memory of 2284 936 mstsca.exe 93 PID 936 wrote to memory of 2284 936 mstsca.exe 93 PID 936 wrote to memory of 2284 936 mstsca.exe 93 PID 936 wrote to memory of 2284 936 mstsca.exe 93 PID 936 wrote to memory of 2284 936 mstsca.exe 93 PID 936 wrote to memory of 2284 936 mstsca.exe 93
Processes
-
C:\Users\Admin\AppData\Local\Temp\b32b5befec6b3ede50cbbe5b87a59fb1.exe"C:\Users\Admin\AppData\Local\Temp\b32b5befec6b3ede50cbbe5b87a59fb1.exe"1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:860 -
C:\Users\Admin\AppData\Local\Temp\b32b5befec6b3ede50cbbe5b87a59fb1.exe"C:\Users\Admin\AppData\Local\Temp\b32b5befec6b3ede50cbbe5b87a59fb1.exe"2⤵
- Adds Run key to start application
- Modifies system certificate store
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:3920 -
C:\Windows\SysWOW64\icacls.exeicacls "C:\Users\Admin\AppData\Local\38e8c03e-6acb-414e-a50e-eb302038e538" /deny *S-1-1-0:(OI)(CI)(DE,DC)3⤵
- Modifies file permissions
PID:3004
-
-
C:\Users\Admin\AppData\Local\Temp\b32b5befec6b3ede50cbbe5b87a59fb1.exe"C:\Users\Admin\AppData\Local\Temp\b32b5befec6b3ede50cbbe5b87a59fb1.exe" --Admin IsNotAutoStart IsNotTask3⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2760 -
C:\Users\Admin\AppData\Local\Temp\b32b5befec6b3ede50cbbe5b87a59fb1.exe"C:\Users\Admin\AppData\Local\Temp\b32b5befec6b3ede50cbbe5b87a59fb1.exe" --Admin IsNotAutoStart IsNotTask4⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:2984 -
C:\Users\Admin\AppData\Local\741de316-548e-428f-a28f-2693cc8716b5\build2.exe"C:\Users\Admin\AppData\Local\741de316-548e-428f-a28f-2693cc8716b5\build2.exe"5⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4000 -
C:\Users\Admin\AppData\Local\741de316-548e-428f-a28f-2693cc8716b5\build2.exe"C:\Users\Admin\AppData\Local\741de316-548e-428f-a28f-2693cc8716b5\build2.exe"6⤵
- Executes dropped EXE
- Loads dropped DLL
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:3844 -
C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im build2.exe /f & timeout /t 6 & del /f /q "C:\Users\Admin\AppData\Local\741de316-548e-428f-a28f-2693cc8716b5\build2.exe" & del C:\ProgramData\*.dll & exit7⤵
- Suspicious use of WriteProcessMemory
PID:2836 -
C:\Windows\SysWOW64\taskkill.exetaskkill /im build2.exe /f8⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
PID:2848
-
-
C:\Windows\SysWOW64\timeout.exetimeout /t 68⤵
- Delays execution with timeout.exe
PID:680
-
-
-
-
-
C:\Users\Admin\AppData\Local\741de316-548e-428f-a28f-2693cc8716b5\build3.exe"C:\Users\Admin\AppData\Local\741de316-548e-428f-a28f-2693cc8716b5\build3.exe"5⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1712 -
C:\Users\Admin\AppData\Local\741de316-548e-428f-a28f-2693cc8716b5\build3.exe"C:\Users\Admin\AppData\Local\741de316-548e-428f-a28f-2693cc8716b5\build3.exe"6⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
PID:2164 -
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"7⤵
- Creates scheduled task(s)
PID:3956
-
-
-
-
-
-
-
C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exeC:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:936 -
C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exeC:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe2⤵
- Executes dropped EXE
PID:2284 -
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"3⤵
- Creates scheduled task(s)
PID:608
-
-
-
C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exeC:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
PID:744 -
C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exeC:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe2⤵
- Executes dropped EXE
PID:3956
-
-
C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exeC:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
PID:3688 -
C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exeC:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe2⤵
- Executes dropped EXE
PID:636
-