oski | f98f307a6a414fcbe42e1017d720f1ed8c9e0df21b703f74e94dbe1afa8b32ff

General

Target
PLI5130745618.exe
Size 226KB
Sample210503-dtx8clwq9s
SHA256 f98f307a6a414fcbe42e1017d720f1ed8c9e0df21b703f74e94dbe1afa8b32ff
MD5 9b807ec7d5c9fa755cd95453f9a7c0d0
SHA1 9bb35f35f97839e4c995ab39246a5caac983c928
SHA512 cdead31dc1be9a60e3fe616b4dbf47bd646b0ea89ea2f676590222d8a4917d46af310d63844c1374faf76be032ff84ac5d3d25f9b4949e11b226a38e12d71e46
MD5 SHA1 SHA512

Score

10^/10

oski discovery infostealer spyware stealer

Malware Config

Extracted

Family

oski

C2

31.210.21.231

Signatures

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

Loads dropped DLL 3 IoCs

pid	Process
3388	PLI5130745618.exe
3388	PLI5130745618.exe
3388	PLI5130745618.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

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3920 set thread context of 3388	3920	PLI5130745618.exe	79

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	PLI5130745618.exe

Kills process with taskkill 1 IoCs

evasion

pid	Process
3852	taskkill.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
3920	PLI5130745618.exe
3920	PLI5130745618.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3920	PLI5130745618.exe
Token: SeDebugPrivilege	3852	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 3920 wrote to memory of 3388	3920	PLI5130745618.exe	79
PID 3920 wrote to memory of 3388	3920	PLI5130745618.exe	79
PID 3920 wrote to memory of 3388	3920	PLI5130745618.exe	79
PID 3920 wrote to memory of 3388	3920	PLI5130745618.exe	79
PID 3920 wrote to memory of 3388	3920	PLI5130745618.exe	79
PID 3920 wrote to memory of 3388	3920	PLI5130745618.exe	79
PID 3920 wrote to memory of 3388	3920	PLI5130745618.exe	79
PID 3920 wrote to memory of 3388	3920	PLI5130745618.exe	79
PID 3920 wrote to memory of 3388	3920	PLI5130745618.exe	79
PID 3388 wrote to memory of 3860	3388	PLI5130745618.exe	80
PID 3388 wrote to memory of 3860	3388	PLI5130745618.exe	80
PID 3388 wrote to memory of 3860	3388	PLI5130745618.exe	80
PID 3860 wrote to memory of 3852	3860	cmd.exe	82
PID 3860 wrote to memory of 3852	3860	cmd.exe	82
PID 3860 wrote to memory of 3852	3860	cmd.exe	82

C:\Users\Admin\AppData\Local\Temp\PLI5130745618.exe
"C:\Users\Admin\AppData\Local\Temp\PLI5130745618.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3920
- C:\Users\Admin\AppData\Local\Temp\PLI5130745618.exe
  C:\Users\Admin\AppData\Local\Temp\PLI5130745618.exe
  2⤵
  - Loads dropped DLL
  - Checks processor information in registry
  - Suspicious use of WriteProcessMemory
  PID:3388
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c taskkill /pid 3388 & erase C:\Users\Admin\AppData\Local\Temp\PLI5130745618.exe & RD /S /Q C:\\ProgramData\\731662441977852\\* & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:3860
  - - C:\Windows\SysWOW64\taskkill.exe
      taskkill /pid 3388
      4⤵
      Kills process with taskkill
      Suspicious use of AdjustPrivilegeToken
      PID:3852

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

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Downloads

memory/3388-124-0x0000000000400000-0x0000000000438000-memory.dmp

Download

memory/3388-122-0x0000000000400000-0x0000000000438000-memory.dmp

Download

memory/3920-118-0x0000000005850000-0x0000000005851000-memory.dmp

Download

memory/3920-121-0x00000000068C0000-0x00000000068DD000-memory.dmp

Download

memory/3920-120-0x0000000006740000-0x0000000006741000-memory.dmp

Download

memory/3920-119-0x00000000057C0000-0x00000000057C1000-memory.dmp

Download

memory/3920-114-0x0000000000F10000-0x0000000000F11000-memory.dmp

Download

memory/3920-117-0x0000000005CD0000-0x0000000005CD1000-memory.dmp

Download

memory/3920-116-0x0000000005700000-0x0000000005702000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads