oski | d950a4ee53971eb72e947a01bb1093a04676b7587fc0c6ccc26d9c964b1fc916

General

Target
CDFE55D91D06B911A69EB050AE0ABBFE.exe
Size 200KB
Sample210902-mxdrw8webj
SHA256 d950a4ee53971eb72e947a01bb1093a04676b7587fc0c6ccc26d9c964b1fc916
MD5 cdfe55d91d06b911a69eb050ae0abbfe
SHA1 cafc732020641aac537da6beef18ea3c208d89fa
SHA512 1a5748d2462a4ef261ecad4d3408f54683c749b7ba5550bc17391ac346d564e1c3e9b1565c96d629d72852e9c98fc434909d928b0489fb0f1fab3777bcadc29c
MD5 SHA1 SHA512

Score

10^/10

oski discovery infostealer spyware stealer

Malware Config

Signatures

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

Deletes itself 1 IoCs

pid	Process
624	cmd.exe

Loads dropped DLL 5 IoCs

pid	Process
1840	CDFE55D91D06B911A69EB050AE0ABBFE.exe
1840	CDFE55D91D06B911A69EB050AE0ABBFE.exe
1840	CDFE55D91D06B911A69EB050AE0ABBFE.exe
1840	CDFE55D91D06B911A69EB050AE0ABBFE.exe
1840	CDFE55D91D06B911A69EB050AE0ABBFE.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	CDFE55D91D06B911A69EB050AE0ABBFE.exe

Kills process with taskkill 1 IoCs

evasion

pid	Process
396	taskkill.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	396	taskkill.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 1840 wrote to memory of 624	1840	CDFE55D91D06B911A69EB050AE0ABBFE.exe	31
PID 1840 wrote to memory of 624	1840	CDFE55D91D06B911A69EB050AE0ABBFE.exe	31
PID 1840 wrote to memory of 624	1840	CDFE55D91D06B911A69EB050AE0ABBFE.exe	31
PID 1840 wrote to memory of 624	1840	CDFE55D91D06B911A69EB050AE0ABBFE.exe	31
PID 624 wrote to memory of 396	624	cmd.exe	33
PID 624 wrote to memory of 396	624	cmd.exe	33
PID 624 wrote to memory of 396	624	cmd.exe	33
PID 624 wrote to memory of 396	624	cmd.exe	33

C:\Users\Admin\AppData\Local\Temp\CDFE55D91D06B911A69EB050AE0ABBFE.exe
"C:\Users\Admin\AppData\Local\Temp\CDFE55D91D06B911A69EB050AE0ABBFE.exe"
1⤵
- Loads dropped DLL
- Checks processor information in registry
- Suspicious use of WriteProcessMemory
PID:1840
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c taskkill /pid 1840 & erase C:\Users\Admin\AppData\Local\Temp\CDFE55D91D06B911A69EB050AE0ABBFE.exe & RD /S /Q C:\\ProgramData\\356912541103138\\* & exit
  2⤵
  - Deletes itself
  - Suspicious use of WriteProcessMemory
  PID:624
- - C:\Windows\SysWOW64\taskkill.exe
    taskkill /pid 1840
    3⤵
    - Kills process with taskkill
    - Suspicious use of AdjustPrivilegeToken
    PID:396

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/1840-60-0x0000000074D91000-0x0000000074D93000-memory.dmp

Download

Analysis

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