3dcf071645ab0543774575cf43ba0bf2207d2257c190be11609ddd30b3d5e4a9

Analysis

max time kernel
153s
max time network
195s
platform
windows10-2004_x64
resource
win10v2004-20221111-en
resource tags

arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
submitted
27/11/2022, 01:48

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General

Target
3dcf071645ab0543774575cf43ba0bf2207d2257c190be11609ddd30b3d5e4a9.exe
Size 365KB
Sample221127-b8cnqsbd64
SHA256 3dcf071645ab0543774575cf43ba0bf2207d2257c190be11609ddd30b3d5e4a9
MD5 257ba86a2263c16001d06f77e346ef86
SHA1 1068158a1d06ac36983fb1586680224dc16a57bc
SHA512 a00c26236b71e61fd2b13710f8a64763b1bdf6199bc8a40ea9fe98a1c8fc8496fb83a5f0e04e029a049eb82dcd2c162ab782d27b9d4f8ad8db730f4f0d97d464
SSDEEP 6144:WXV+JnRQtCJmM+mKwYpzyAtmLbR9JWJW+lU3hJ272Ja2P4337MqjrEVGPjk7ngIk:eAROuRvEUla2P4brEyjk7ngYsP
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

persistence

Malware Config

Signatures

Modifies WinLogon for persistence 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit = "userinit.exe,\"C:\\Windows\\system32\\clientsvr.exe\""	scvhost.exe

Executes dropped EXE 1 IoCs

pid	Process
4992	scvhost.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-4246620582-653642754-1174164128-1000\Control Panel\International\Geo\Nation	3dcf071645ab0543774575cf43ba0bf2207d2257c190be11609ddd30b3d5e4a9.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-4246620582-653642754-1174164128-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\Audio Manger = "\"C:\\ProgramData\\915864\\scvhost.exe\""	scvhost.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\clientsvr.exe	scvhost.exe
File opened for modification	C:\Windows\SysWOW64\clientsvr.exe	scvhost.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
4992	scvhost.exe
4992	scvhost.exe
4992	scvhost.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4992	scvhost.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4992	scvhost.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 4176 wrote to memory of 4992	4176	3dcf071645ab0543774575cf43ba0bf2207d2257c190be11609ddd30b3d5e4a9.exe	86
PID 4176 wrote to memory of 4992	4176	3dcf071645ab0543774575cf43ba0bf2207d2257c190be11609ddd30b3d5e4a9.exe	86
PID 4176 wrote to memory of 4992	4176	3dcf071645ab0543774575cf43ba0bf2207d2257c190be11609ddd30b3d5e4a9.exe	86

C:\Users\Admin\AppData\Local\Temp\3dcf071645ab0543774575cf43ba0bf2207d2257c190be11609ddd30b3d5e4a9.exe
"C:\Users\Admin\AppData\Local\Temp\3dcf071645ab0543774575cf43ba0bf2207d2257c190be11609ddd30b3d5e4a9.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4176
- C:\ProgramData\915864\scvhost.exe
  "C:\ProgramData\915864\scvhost.exe"
  2⤵
  - Modifies WinLogon for persistence
  - Executes dropped EXE
  - Adds Run key to start application
  - Drops file in System32 directory
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  PID:4992

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Winlogon Helper DLL

T1004

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

scvhost.exe

Path C:\ProgramData\915864\scvhost.exe
Size 365KB
SHA256 3dcf071645ab0543774575cf43ba0bf2207d2257c190be11609ddd30b3d5e4a9
MD5 257ba86a2263c16001d06f77e346ef86
SHA1 1068158a1d06ac36983fb1586680224dc16a57bc
SHA512 a00c26236b71e61fd2b13710f8a64763b1bdf6199bc8a40ea9fe98a1c8fc8496fb83a5f0e04e029a049eb82dcd2c162ab782d27b9d4f8ad8db730f4f0d97d464
SSDEEP 6144:WXV+JnRQtCJmM+mKwYpzyAtmLbR9JWJW+lU3hJ272Ja2P4337MqjrEVGPjk7ngIk:eAROuRvEUla2P4brEyjk7ngYsP
MD5 SHA1 SHA512 SSDEEP

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scvhost.exe

Path C:\ProgramData\915864\scvhost.exe
Size 365KB
SHA256 3dcf071645ab0543774575cf43ba0bf2207d2257c190be11609ddd30b3d5e4a9
MD5 257ba86a2263c16001d06f77e346ef86
SHA1 1068158a1d06ac36983fb1586680224dc16a57bc
SHA512 a00c26236b71e61fd2b13710f8a64763b1bdf6199bc8a40ea9fe98a1c8fc8496fb83a5f0e04e029a049eb82dcd2c162ab782d27b9d4f8ad8db730f4f0d97d464
SSDEEP 6144:WXV+JnRQtCJmM+mKwYpzyAtmLbR9JWJW+lU3hJ272Ja2P4337MqjrEVGPjk7ngIk:eAROuRvEUla2P4brEyjk7ngYsP
MD5 SHA1 SHA512 SSDEEP

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memory/4176-132-0x0000000074EC0000-0x0000000075471000-memory.dmp

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memory/4176-133-0x0000000074EC0000-0x0000000075471000-memory.dmp

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memory/4992-137-0x0000000074EC0000-0x0000000075471000-memory.dmp

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memory/4992-138-0x0000000074EC0000-0x0000000075471000-memory.dmp

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