oski | 76891a7bc50be94f6c5ad4e10cbb3a6eb515d452e5bcf80efbde25d8b61d8607

General

Target
f93fe182b5ec5a3a1e343110b1ca22a0.exe
Size 243KB
Sample211008-nz6xfaeba2
SHA256 76891a7bc50be94f6c5ad4e10cbb3a6eb515d452e5bcf80efbde25d8b61d8607
MD5 f93fe182b5ec5a3a1e343110b1ca22a0
SHA1 0e0071d31a81435b3f3af726a6ecb69e75fe4d15
SHA512 3b9ef3ce57590f598896c837209cedc1bf7164637342b46b578418f2e64036c332df0dc80a25402130757baac8d97221a9f4eddac5ac84058493f6a611b7625b
MD5 SHA1 SHA512

Score

10^/10

oski discovery infostealer spyware stealer

Malware Config

Extracted

Family

oski

C2

lg-tvproducts.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
1776	f93fe182b5ec5a3a1e343110b1ca22a0.exe
2240	f93fe182b5ec5a3a1e343110b1ca22a0.exe
2240	f93fe182b5ec5a3a1e343110b1ca22a0.exe
2240	f93fe182b5ec5a3a1e343110b1ca22a0.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	f93fe182b5ec5a3a1e343110b1ca22a0.exe

Kills process with taskkill 1 IoCs

evasion

pid	Process
4004	taskkill.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4004	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 1776 wrote to memory of 2240	1776	f93fe182b5ec5a3a1e343110b1ca22a0.exe	70
PID 1776 wrote to memory of 2240	1776	f93fe182b5ec5a3a1e343110b1ca22a0.exe	70
PID 1776 wrote to memory of 2240	1776	f93fe182b5ec5a3a1e343110b1ca22a0.exe	70
PID 1776 wrote to memory of 2240	1776	f93fe182b5ec5a3a1e343110b1ca22a0.exe	70
PID 1776 wrote to memory of 2240	1776	f93fe182b5ec5a3a1e343110b1ca22a0.exe	70
PID 1776 wrote to memory of 2240	1776	f93fe182b5ec5a3a1e343110b1ca22a0.exe	70
PID 1776 wrote to memory of 2240	1776	f93fe182b5ec5a3a1e343110b1ca22a0.exe	70
PID 1776 wrote to memory of 2240	1776	f93fe182b5ec5a3a1e343110b1ca22a0.exe	70
PID 1776 wrote to memory of 2240	1776	f93fe182b5ec5a3a1e343110b1ca22a0.exe	70
PID 2240 wrote to memory of 2212	2240	f93fe182b5ec5a3a1e343110b1ca22a0.exe	71
PID 2240 wrote to memory of 2212	2240	f93fe182b5ec5a3a1e343110b1ca22a0.exe	71
PID 2240 wrote to memory of 2212	2240	f93fe182b5ec5a3a1e343110b1ca22a0.exe	71
PID 2212 wrote to memory of 4004	2212	cmd.exe	73
PID 2212 wrote to memory of 4004	2212	cmd.exe	73
PID 2212 wrote to memory of 4004	2212	cmd.exe	73

C:\Users\Admin\AppData\Local\Temp\f93fe182b5ec5a3a1e343110b1ca22a0.exe
"C:\Users\Admin\AppData\Local\Temp\f93fe182b5ec5a3a1e343110b1ca22a0.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:1776
- C:\Users\Admin\AppData\Local\Temp\f93fe182b5ec5a3a1e343110b1ca22a0.exe
  "C:\Users\Admin\AppData\Local\Temp\f93fe182b5ec5a3a1e343110b1ca22a0.exe"
  2⤵
  - Loads dropped DLL
  - Checks processor information in registry
  - Suspicious use of WriteProcessMemory
  PID:2240
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c taskkill /pid 2240 & erase C:\Users\Admin\AppData\Local\Temp\f93fe182b5ec5a3a1e343110b1ca22a0.exe & RD /S /Q C:\\ProgramData\\086077023882663\\* & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2212
  - - C:\Windows\SysWOW64\taskkill.exe
      taskkill /pid 2240
      4⤵
      Kills process with taskkill
      Suspicious use of AdjustPrivilegeToken
      PID:4004

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

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Downloads

memory/2240-118-0x0000000000440000-0x0000000000478000-memory.dmp

Download

memory/2240-121-0x0000000000440000-0x0000000000478000-memory.dmp