oski | 4fdd785a78c5dfcecf40931ff10d7d1a9dfe36a0dc85e13e72ab0ef75230ee52

General

Target
Trf 862930873.exe
Size 316KB
Sample211008-c6fhaadaf5
SHA256 4fdd785a78c5dfcecf40931ff10d7d1a9dfe36a0dc85e13e72ab0ef75230ee52
MD5 f68ff9908921c8063858020d8c4f5f1b
SHA1 5056a2ff7bad3ff23b6fa027202a833a83278c50
SHA512 cf4e0b09525b615259decbcd9b09e8ffeccb9af878af35a59c8b65664c730d19e5506929848f38acb87e5733fadeb7a74c0b9ccffd02cdbe5160b9a40cf411a0
MD5 SHA1 SHA512

Score

10^/10

oski discovery infostealer spyware stealer

Malware Config

Extracted

Family

oski

C2

21slg.xyz

Signatures

Oski
Oski is an infostealer targeting browser data, crypto wallets.
infostealer oski
Downloads MZ/PE file

Loads dropped DLL 4 IoCs

pid	Process
664	Trf 862930873.exe
3884	Trf 862930873.exe
3884	Trf 862930873.exe
3884	Trf 862930873.exe

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081
Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
spyware

Data from Local System
T1005

Credentials in Files
T1081
Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Checks processor information in registry 2 TTPs 1 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	Trf 862930873.exe

Kills process with taskkill 1 IoCs

evasion

pid	Process
1020	taskkill.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1020	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 664 wrote to memory of 3884	664	Trf 862930873.exe	72
PID 664 wrote to memory of 3884	664	Trf 862930873.exe	72
PID 664 wrote to memory of 3884	664	Trf 862930873.exe	72
PID 664 wrote to memory of 3884	664	Trf 862930873.exe	72
PID 664 wrote to memory of 3884	664	Trf 862930873.exe	72
PID 664 wrote to memory of 3884	664	Trf 862930873.exe	72
PID 664 wrote to memory of 3884	664	Trf 862930873.exe	72
PID 664 wrote to memory of 3884	664	Trf 862930873.exe	72
PID 664 wrote to memory of 3884	664	Trf 862930873.exe	72
PID 3884 wrote to memory of 1820	3884	Trf 862930873.exe	74
PID 3884 wrote to memory of 1820	3884	Trf 862930873.exe	74
PID 3884 wrote to memory of 1820	3884	Trf 862930873.exe	74
PID 1820 wrote to memory of 1020	1820	cmd.exe	76
PID 1820 wrote to memory of 1020	1820	cmd.exe	76
PID 1820 wrote to memory of 1020	1820	cmd.exe	76

C:\Users\Admin\AppData\Local\Temp\Trf 862930873.exe
"C:\Users\Admin\AppData\Local\Temp\Trf 862930873.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:664
- C:\Users\Admin\AppData\Local\Temp\Trf 862930873.exe
  "C:\Users\Admin\AppData\Local\Temp\Trf 862930873.exe"
  2⤵
  - Loads dropped DLL
  - Checks processor information in registry
  - Suspicious use of WriteProcessMemory
  PID:3884
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c taskkill /pid 3884 & erase C:\Users\Admin\AppData\Local\Temp\Trf 862930873.exe & RD /S /Q C:\\ProgramData\\579969664261747\\* & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1820
  - - C:\Windows\SysWOW64\taskkill.exe
      taskkill /pid 3884
      4⤵
      Kills process with taskkill
      Suspicious use of AdjustPrivilegeToken
      PID:1020

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials in Files

2

T1081

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Data from Local System

2

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

memory/3884-116-0x0000000000450000-0x0000000000488000-memory.dmp

Download

memory/3884-119-0x0000000000450000-0x0000000000488000-memory.dmp