oski | 938f4e648e57b9ad6d41ea3fe8707c0f249ba2baa24a5af557b4f09d698b8145

General

Target

938f4e648e57b9ad6d41ea3fe8707c0f249ba2baa24a5.exe
Size

470KB
MD5

b0d0a4af8f13d80eafe1238bd3f684c8
SHA1

23f10ff96e9933590fb9c384c543d20ab695733f
SHA256

938f4e648e57b9ad6d41ea3fe8707c0f249ba2baa24a5af557b4f09d698b8145
SHA512

5c5297e21c1a37d72894cd232a0833c917d886fb2f8aae9015a41b986a8c4738d90372181cfad5d1bb2584e9b4fbfa2a719752f2973629e42cd562487cdbeffd

Score

10^/10

oski infostealer persistence

Malware Config

Extracted

Family

oski

C2

manguerassorna.com

Signatures

Oski
Oski is an infostealer targeting browser data, crypto wallets.
infostealer oski

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-1-5-21-2660308776-3705150086-26593515-1000\Control Panel\International\Geo\Nation	938f4e648e57b9ad6d41ea3fe8707c0f249ba2baa24a5.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-1-5-21-2660308776-3705150086-26593515-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\wınrarçexe = "\"C:\\Users\\Admin\\AppData\\Roaming\\wınrarçexe.exe\""	938f4e648e57b9ad6d41ea3fe8707c0f249ba2baa24a5.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4104 set thread context of 5100	4104	938f4e648e57b9ad6d41ea3fe8707c0f249ba2baa24a5.exe	84

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

System Information Discovery
T1082

Program crash 1 IoCs

pid	pid_target	Process	procid_target
3464	5100	WerFault.exe	84

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2168	powershell.exe
2168	powershell.exe
4104	938f4e648e57b9ad6d41ea3fe8707c0f249ba2baa24a5.exe
4104	938f4e648e57b9ad6d41ea3fe8707c0f249ba2baa24a5.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2168	powershell.exe
Token: SeDebugPrivilege	4104	938f4e648e57b9ad6d41ea3fe8707c0f249ba2baa24a5.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 4104 wrote to memory of 2168	4104	938f4e648e57b9ad6d41ea3fe8707c0f249ba2baa24a5.exe	81
PID 4104 wrote to memory of 2168	4104	938f4e648e57b9ad6d41ea3fe8707c0f249ba2baa24a5.exe	81
PID 4104 wrote to memory of 2168	4104	938f4e648e57b9ad6d41ea3fe8707c0f249ba2baa24a5.exe	81
PID 4104 wrote to memory of 5100	4104	938f4e648e57b9ad6d41ea3fe8707c0f249ba2baa24a5.exe	84
PID 4104 wrote to memory of 5100	4104	938f4e648e57b9ad6d41ea3fe8707c0f249ba2baa24a5.exe	84
PID 4104 wrote to memory of 5100	4104	938f4e648e57b9ad6d41ea3fe8707c0f249ba2baa24a5.exe	84
PID 4104 wrote to memory of 5100	4104	938f4e648e57b9ad6d41ea3fe8707c0f249ba2baa24a5.exe	84
PID 4104 wrote to memory of 5100	4104	938f4e648e57b9ad6d41ea3fe8707c0f249ba2baa24a5.exe	84
PID 4104 wrote to memory of 5100	4104	938f4e648e57b9ad6d41ea3fe8707c0f249ba2baa24a5.exe	84
PID 4104 wrote to memory of 5100	4104	938f4e648e57b9ad6d41ea3fe8707c0f249ba2baa24a5.exe	84
PID 4104 wrote to memory of 5100	4104	938f4e648e57b9ad6d41ea3fe8707c0f249ba2baa24a5.exe	84
PID 4104 wrote to memory of 5100	4104	938f4e648e57b9ad6d41ea3fe8707c0f249ba2baa24a5.exe	84

C:\Users\Admin\AppData\Local\Temp\938f4e648e57b9ad6d41ea3fe8707c0f249ba2baa24a5.exe
"C:\Users\Admin\AppData\Local\Temp\938f4e648e57b9ad6d41ea3fe8707c0f249ba2baa24a5.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4104
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -enc UwB0AGEAcgB0AC0AUwBsAGUAZQBwACAALQBTAGUAYwBvAG4AZABzACAAMgAwAA==
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2168
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe
  C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe
  2⤵
  PID:5100
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 5100 -s 1288
    3⤵
    - Program crash
    PID:3464

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 428 -p 5100 -ip 5100
1⤵
PID:4152

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

memory/2168-138-0x0000000007210000-0x000000000788A000-memory.dmp

Filesize
6.5MB

Download
memory/2168-134-0x0000000004D80000-0x00000000053A8000-memory.dmp

Filesize
6.2MB

Download
memory/2168-133-0x0000000000E00000-0x0000000000E36000-memory.dmp

Filesize
216KB

Download
memory/2168-137-0x0000000005BA0000-0x0000000005BBE000-memory.dmp

Filesize
120KB

Download
memory/2168-135-0x0000000005480000-0x00000000054E6000-memory.dmp

Filesize
408KB

Download
memory/2168-139-0x0000000006090000-0x00000000060AA000-memory.dmp

Filesize
104KB

Download
memory/2168-136-0x0000000005560000-0x00000000055C6000-memory.dmp

Filesize
408KB

Download
memory/4104-130-0x0000000000C50000-0x0000000000CC8000-memory.dmp

Filesize
480KB

Download
memory/4104-131-0x0000000005760000-0x0000000005782000-memory.dmp

Filesize
136KB

Download
memory/5100-141-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/5100-142-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/5100-143-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/5100-144-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/5100-145-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download

Analysis

Sharing