Analysis
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max time kernel
145s -
max time network
148s -
platform
windows10-2004_x64 -
resource
win10v2004-20230220-en -
resource tags
arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system -
submitted
29-05-2023 08:13
Behavioral task
behavioral1
Sample
ren_installer.exe
Resource
win7-20230220-en
Behavioral task
behavioral2
Sample
ren_installer.exe
Resource
win10v2004-20230220-en
General
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Target
ren_installer.exe
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Size
3.1MB
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MD5
6584be6ee6ef26f3636531c0e3f41cee
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SHA1
e5291dc84bd32fed5831eafc33473ccdaf09ac16
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SHA256
716153d5958b307c96be985da422552195800586967911ec5a69d4aa3e7236e7
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SHA512
c2328165200248dd5aa964e8f16872a5dffddc079c958b0b1fef95959030637757af98eb8ebe768aaf96772e5f8592caf57f331b1e94eaa9834ca636c749dab6
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SSDEEP
49152:Kvgt62XlaSFNWPjljiFa2RoUYIT9OTj81JdLoGnT07THHB72eh2NT:KvM62XlaSFNWPjljiFXRoUYIyjOl
Malware Config
Extracted
quasar
1.4.1
ReServices
185.65.134.175:55498
86e242cc-399d-4e30-a743-e89f0418f106
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encryption_key
B451C26057A2AEFC83990793720D2316EA48C49A
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install_name
renservice.exe
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log_directory
Logs
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reconnect_delay
3000
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startup_key
renservice
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subdirectory
servicerenk
Signatures
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Quasar payload 3 IoCs
Processes:
resource yara_rule behavioral2/memory/3924-133-0x0000000000FE0000-0x0000000001304000-memory.dmp family_quasar C:\Windows\System32\servicerenk\renservice.exe family_quasar C:\Windows\system32\servicerenk\renservice.exe family_quasar -
Executes dropped EXE 1 IoCs
Processes:
renservice.exepid process 4052 renservice.exe -
Drops file in System32 directory 5 IoCs
Processes:
ren_installer.exerenservice.exedescription ioc process File opened for modification C:\Windows\system32\servicerenk ren_installer.exe File opened for modification C:\Windows\system32\servicerenk\renservice.exe renservice.exe File opened for modification C:\Windows\system32\servicerenk renservice.exe File created C:\Windows\system32\servicerenk\renservice.exe ren_installer.exe File opened for modification C:\Windows\system32\servicerenk\renservice.exe ren_installer.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Creates scheduled task(s) 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
Processes:
schtasks.exeschtasks.exepid process 5068 schtasks.exe 3140 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
ren_installer.exerenservice.exedescription pid process Token: SeDebugPrivilege 3924 ren_installer.exe Token: SeDebugPrivilege 4052 renservice.exe -
Suspicious use of FindShellTrayWindow 6 IoCs
Processes:
renservice.exepid process 4052 renservice.exe 4052 renservice.exe 4052 renservice.exe 4052 renservice.exe 4052 renservice.exe 4052 renservice.exe -
Suspicious use of SendNotifyMessage 6 IoCs
Processes:
renservice.exepid process 4052 renservice.exe 4052 renservice.exe 4052 renservice.exe 4052 renservice.exe 4052 renservice.exe 4052 renservice.exe -
Suspicious use of WriteProcessMemory 6 IoCs
Processes:
ren_installer.exerenservice.exedescription pid process target process PID 3924 wrote to memory of 5068 3924 ren_installer.exe schtasks.exe PID 3924 wrote to memory of 5068 3924 ren_installer.exe schtasks.exe PID 3924 wrote to memory of 4052 3924 ren_installer.exe renservice.exe PID 3924 wrote to memory of 4052 3924 ren_installer.exe renservice.exe PID 4052 wrote to memory of 3140 4052 renservice.exe schtasks.exe PID 4052 wrote to memory of 3140 4052 renservice.exe schtasks.exe -
Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
Processes
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C:\Users\Admin\AppData\Local\Temp\ren_installer.exe"C:\Users\Admin\AppData\Local\Temp\ren_installer.exe"1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "renservice" /sc ONLOGON /tr "C:\Windows\system32\servicerenk\renservice.exe" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
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C:\Windows\system32\servicerenk\renservice.exe"C:\Windows\system32\servicerenk\renservice.exe"2⤵
- Executes dropped EXE
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of WriteProcessMemory
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C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "renservice" /sc ONLOGON /tr "C:\Windows\system32\servicerenk\renservice.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
Network
MITRE ATT&CK Matrix ATT&CK v6
Replay Monitor
Loading Replay Monitor...
Downloads
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C:\Windows\System32\servicerenk\renservice.exeFilesize
3.1MB
MD56584be6ee6ef26f3636531c0e3f41cee
SHA1e5291dc84bd32fed5831eafc33473ccdaf09ac16
SHA256716153d5958b307c96be985da422552195800586967911ec5a69d4aa3e7236e7
SHA512c2328165200248dd5aa964e8f16872a5dffddc079c958b0b1fef95959030637757af98eb8ebe768aaf96772e5f8592caf57f331b1e94eaa9834ca636c749dab6
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C:\Windows\system32\servicerenk\renservice.exeFilesize
3.1MB
MD56584be6ee6ef26f3636531c0e3f41cee
SHA1e5291dc84bd32fed5831eafc33473ccdaf09ac16
SHA256716153d5958b307c96be985da422552195800586967911ec5a69d4aa3e7236e7
SHA512c2328165200248dd5aa964e8f16872a5dffddc079c958b0b1fef95959030637757af98eb8ebe768aaf96772e5f8592caf57f331b1e94eaa9834ca636c749dab6
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memory/3924-133-0x0000000000FE0000-0x0000000001304000-memory.dmpFilesize
3.1MB
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memory/3924-134-0x000000001C050000-0x000000001C060000-memory.dmpFilesize
64KB
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memory/4052-141-0x0000000001500000-0x0000000001510000-memory.dmpFilesize
64KB
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memory/4052-142-0x000000001C9F0000-0x000000001CA40000-memory.dmpFilesize
320KB
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memory/4052-143-0x000000001CB00000-0x000000001CBB2000-memory.dmpFilesize
712KB
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memory/4052-146-0x0000000001500000-0x0000000001510000-memory.dmpFilesize
64KB
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memory/4052-147-0x000000001CA40000-0x000000001CA52000-memory.dmpFilesize
72KB
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memory/4052-148-0x000000001CAA0000-0x000000001CADC000-memory.dmpFilesize
240KB