oski | a5c9be9bcb214e69a39285a634f95e43fdf1ad10536bcc9bce84be7edb48cb31

General

Target
IMG0537521501.exe
Size 218KB
Sample210428-ncb2swdxbx
SHA256 a5c9be9bcb214e69a39285a634f95e43fdf1ad10536bcc9bce84be7edb48cb31
MD5 590fc5d8cc6f8dc41aa4e40b63aa663f
SHA1 2d063d7f428f549017b8e0d00f55401bf8fbaa1f
SHA512 6502f76d5efe8529b17ada427b9d32dd202793dc128e116a291ea68903b489ae615f1f9d61cdd470efcf44e148679cdca2a726764e22d1c98871bd2662cfc2bc
MD5 SHA1 SHA512

Score

10^/10

oski discovery infostealer spyware stealer

Malware Config

Extracted

Family

oski

C2

31.210.20.238

Signatures

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

Deletes itself 1 IoCs

pid	Process
1644	cmd.exe

Loads dropped DLL 5 IoCs

pid	Process
1248	IMG0537521501.exe
1248	IMG0537521501.exe
1248	IMG0537521501.exe
1248	IMG0537521501.exe
1248	IMG0537521501.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 340 set thread context of 1248	340	IMG0537521501.exe	29

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	IMG0537521501.exe

Kills process with taskkill 1 IoCs

evasion

pid	Process
684	taskkill.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
340	IMG0537521501.exe
340	IMG0537521501.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	340	IMG0537521501.exe
Token: SeDebugPrivilege	684	taskkill.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 340 wrote to memory of 1248	340	IMG0537521501.exe	29
PID 340 wrote to memory of 1248	340	IMG0537521501.exe	29
PID 340 wrote to memory of 1248	340	IMG0537521501.exe	29
PID 340 wrote to memory of 1248	340	IMG0537521501.exe	29
PID 340 wrote to memory of 1248	340	IMG0537521501.exe	29
PID 340 wrote to memory of 1248	340	IMG0537521501.exe	29
PID 340 wrote to memory of 1248	340	IMG0537521501.exe	29
PID 340 wrote to memory of 1248	340	IMG0537521501.exe	29
PID 340 wrote to memory of 1248	340	IMG0537521501.exe	29
PID 340 wrote to memory of 1248	340	IMG0537521501.exe	29
PID 1248 wrote to memory of 1644	1248	IMG0537521501.exe	32
PID 1248 wrote to memory of 1644	1248	IMG0537521501.exe	32
PID 1248 wrote to memory of 1644	1248	IMG0537521501.exe	32
PID 1248 wrote to memory of 1644	1248	IMG0537521501.exe	32
PID 1644 wrote to memory of 684	1644	cmd.exe	34
PID 1644 wrote to memory of 684	1644	cmd.exe	34
PID 1644 wrote to memory of 684	1644	cmd.exe	34
PID 1644 wrote to memory of 684	1644	cmd.exe	34

C:\Users\Admin\AppData\Local\Temp\IMG0537521501.exe
"C:\Users\Admin\AppData\Local\Temp\IMG0537521501.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:340
- C:\Users\Admin\AppData\Local\Temp\IMG0537521501.exe
  C:\Users\Admin\AppData\Local\Temp\IMG0537521501.exe
  2⤵
  - Loads dropped DLL
  - Checks processor information in registry
  - Suspicious use of WriteProcessMemory
  PID:1248
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c taskkill /pid 1248 & erase C:\Users\Admin\AppData\Local\Temp\IMG0537521501.exe & RD /S /Q C:\\ProgramData\\343347471241880\\* & exit
    3⤵
    - Deletes itself
    - Suspicious use of WriteProcessMemory
    PID:1644
  - - C:\Windows\SysWOW64\taskkill.exe
      taskkill /pid 1248
      4⤵
      Kills process with taskkill
      Suspicious use of AdjustPrivilegeToken
      PID:684

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/340-63-0x0000000000230000-0x000000000024C000-memory.dmp

Download

memory/340-59-0x00000000003B0000-0x00000000003B1000-memory.dmp

Download

memory/340-62-0x0000000004980000-0x0000000004981000-memory.dmp

Download

memory/340-61-0x00000000001E0000-0x00000000001E2000-memory.dmp

Download

memory/1248-66-0x00000000750C1000-0x00000000750C3000-memory.dmp

Download

memory/1248-67-0x0000000000400000-0x0000000000438000-memory.dmp

Download

memory/1248-64-0x0000000000400000-0x0000000000438000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads