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Analysis
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max time kernel
34s -
max time network
38s -
platform
windows10-2004_x64 -
resource
win10v2004-20241007-en -
resource tags
arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system -
submitted
17/01/2025, 20:54
General
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Target
Update.exe
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Size
413KB
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MD5
d0564fc7770410d9c9efddfe4318fe40
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SHA1
70e9c65c95ef79a8fb412d4b5baa747be19f358f
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SHA256
926ca6246cafb2f73a2a44325a1c2c9a5e136f109cf5fc1beecfe2611adc95e8
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SHA512
0dbad5c423b060dc3122c8b1d351e6fd519526de74ff01c17997e05ec88b91cb2c9e9267ed406f0f652cd82c788318ca671e7bf6fc6b4b810f780a04521bc37d
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SSDEEP
12288:t1TVVfbfGyO2NHb64vVEWiFjwqLlShatH1GK:9NeyO2NHb64vVEZjbLlS0D
Malware Config
Extracted
quasar
3.1.5
Office04
217.254.98.158:4782
$Sxr-0AJKEcQg2SeZyXPT01
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encryption_key
YCpmQrQIUT3FKePhT9Ax
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install_name
rat_client.exe
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log_directory
Logs
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reconnect_delay
3000
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startup_key
SeroXen Client Startup
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subdirectory
SubDir
Signatures
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Quasar family
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Quasar payload 2 IoCs
resource yara_rule behavioral1/memory/3552-1-0x00000000001C0000-0x000000000022E000-memory.dmp family_quasar behavioral1/files/0x0007000000023cac-10.dat family_quasar -
Command and Scripting Interpreter: PowerShell 1 TTPs 2 IoCs
Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.
pid Process 384 powershell.exe 384 powershell.exe -
Drops file in Drivers directory 1 IoCs
description ioc Process File opened for modification C:\Windows\system32\drivers\etc\hosts Update.exe -
Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
description ioc Process Key value queried \REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\Control Panel\International\Geo\Nation Update.exe -
Executes dropped EXE 1 IoCs
pid Process 2928 rat_client.exe -
Looks up external IP address via web service 2 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
flow ioc 13 ip-api.com 18 ip-api.com -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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System Location Discovery: System Language Discovery 1 TTPs 5 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
description ioc Process Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language rat_client.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language powershell.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language ipconfig.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language SCHTASKS.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language Update.exe -
Gathers network information 2 TTPs 1 IoCs
Uses commandline utility to view network configuration.
pid Process 8 ipconfig.exe -
Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
pid Process 4224 SCHTASKS.exe -
Suspicious behavior: EnumeratesProcesses 2 IoCs
pid Process 384 powershell.exe 384 powershell.exe -
Suspicious use of AdjustPrivilegeToken 3 IoCs
description pid Process Token: SeDebugPrivilege 3552 Update.exe Token: SeDebugPrivilege 384 powershell.exe Token: SeDebugPrivilege 2928 rat_client.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
pid Process 2928 rat_client.exe -
Suspicious use of WriteProcessMemory 12 IoCs
description pid Process procid_target PID 3552 wrote to memory of 2928 3552 Update.exe 85 PID 3552 wrote to memory of 2928 3552 Update.exe 85 PID 3552 wrote to memory of 2928 3552 Update.exe 85 PID 3552 wrote to memory of 384 3552 Update.exe 86 PID 3552 wrote to memory of 384 3552 Update.exe 86 PID 3552 wrote to memory of 384 3552 Update.exe 86 PID 3552 wrote to memory of 8 3552 Update.exe 88 PID 3552 wrote to memory of 8 3552 Update.exe 88 PID 3552 wrote to memory of 8 3552 Update.exe 88 PID 3552 wrote to memory of 4224 3552 Update.exe 90 PID 3552 wrote to memory of 4224 3552 Update.exe 90 PID 3552 wrote to memory of 4224 3552 Update.exe 90
Processes
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C:\Users\Admin\AppData\Local\Temp\Update.exe"C:\Users\Admin\AppData\Local\Temp\Update.exe"1⤵
- Drops file in Drivers directory
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3552 -
C:\Users\Admin\AppData\Roaming\SubDir\rat_client.exe"C:\Users\Admin\AppData\Roaming\SubDir\rat_client.exe"2⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
PID:2928
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C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe"powershell.exe" -WindowStyle Hidden -Command "Add-MpPreference -ExclusionPath (Get-Item -LiteralPath $env:SystemRoot).Root"2⤵
- Command and Scripting Interpreter: PowerShell
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:384
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C:\Windows\SysWOW64\ipconfig.exe"C:\Windows\System32\ipconfig.exe" /flushdns2⤵
- System Location Discovery: System Language Discovery
- Gathers network information
PID:8
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C:\Windows\SysWOW64\SCHTASKS.exe"SCHTASKS.exe" /create /tn "$77Update.exe" /tr "'C:\Users\Admin\AppData\Local\Temp\Update.exe'" /sc onlogon /rl HIGHEST2⤵
- System Location Discovery: System Language Discovery
- Scheduled Task/Job: Scheduled Task
PID:4224
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
60B
MD5d17fe0a3f47be24a6453e9ef58c94641
SHA16ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA25696ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA5125b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82
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Filesize
413KB
MD5d0564fc7770410d9c9efddfe4318fe40
SHA170e9c65c95ef79a8fb412d4b5baa747be19f358f
SHA256926ca6246cafb2f73a2a44325a1c2c9a5e136f109cf5fc1beecfe2611adc95e8
SHA5120dbad5c423b060dc3122c8b1d351e6fd519526de74ff01c17997e05ec88b91cb2c9e9267ed406f0f652cd82c788318ca671e7bf6fc6b4b810f780a04521bc37d