oski | 37f96df377557cad9bdb2caa4064bbf4dd862e935a64e1d802d445358695e15c

General

Target
IMG0540001825.exe
Size 220KB
Sample210429-1lc9me75aa
SHA256 37f96df377557cad9bdb2caa4064bbf4dd862e935a64e1d802d445358695e15c
MD5 fd0e7153869bad651ae4ae4f1dbef3da
SHA1 970796d4c6accf205042632aab92859900a6d0d8
SHA512 ff64f93222370d9f47e88a1a5ea9105e7622d92c8cc991bd59e614298825fb58f7a60ee654801e67fc25f953a7f22336c39c430f69749f7baed3524a2cd58f17
MD5 SHA1 SHA512

Score

10^/10

oski discovery infostealer spyware stealer

Malware Config

Extracted

Family

oski

C2

5azc.club

Signatures

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

Loads dropped DLL 3 IoCs

pid	Process
3308	IMG0540001825.exe
3308	IMG0540001825.exe
3308	IMG0540001825.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 3680 set thread context of 3308	3680	IMG0540001825.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	IMG0540001825.exe

Kills process with taskkill 1 IoCs

evasion

pid	Process
3980	taskkill.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
3680	IMG0540001825.exe
3680	IMG0540001825.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3680	IMG0540001825.exe
Token: SeDebugPrivilege	3980	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 3680 wrote to memory of 3308	3680	IMG0540001825.exe	79
PID 3680 wrote to memory of 3308	3680	IMG0540001825.exe	79
PID 3680 wrote to memory of 3308	3680	IMG0540001825.exe	79
PID 3680 wrote to memory of 3308	3680	IMG0540001825.exe	79
PID 3680 wrote to memory of 3308	3680	IMG0540001825.exe	79
PID 3680 wrote to memory of 3308	3680	IMG0540001825.exe	79
PID 3680 wrote to memory of 3308	3680	IMG0540001825.exe	79
PID 3680 wrote to memory of 3308	3680	IMG0540001825.exe	79
PID 3680 wrote to memory of 3308	3680	IMG0540001825.exe	79
PID 3308 wrote to memory of 1288	3308	IMG0540001825.exe	80
PID 3308 wrote to memory of 1288	3308	IMG0540001825.exe	80
PID 3308 wrote to memory of 1288	3308	IMG0540001825.exe	80
PID 1288 wrote to memory of 3980	1288	cmd.exe	82
PID 1288 wrote to memory of 3980	1288	cmd.exe	82
PID 1288 wrote to memory of 3980	1288	cmd.exe	82

C:\Users\Admin\AppData\Local\Temp\IMG0540001825.exe
"C:\Users\Admin\AppData\Local\Temp\IMG0540001825.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3680
- C:\Users\Admin\AppData\Local\Temp\IMG0540001825.exe
  C:\Users\Admin\AppData\Local\Temp\IMG0540001825.exe
  2⤵
  - Loads dropped DLL
  - Checks processor information in registry
  - Suspicious use of WriteProcessMemory
  PID:3308
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c taskkill /pid 3308 & erase C:\Users\Admin\AppData\Local\Temp\IMG0540001825.exe & RD /S /Q C:\\ProgramData\\999176497533765\\* & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1288
  - - C:\Windows\SysWOW64\taskkill.exe
      taskkill /pid 3308
      4⤵
      Kills process with taskkill
      Suspicious use of AdjustPrivilegeToken
      PID:3980

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/3308-122-0x0000000000400000-0x0000000000438000-memory.dmp

Download

memory/3308-124-0x0000000000400000-0x0000000000438000-memory.dmp

Download

memory/3680-118-0x0000000005420000-0x0000000005421000-memory.dmp

Download

memory/3680-121-0x00000000054A0000-0x00000000054BE000-memory.dmp

Download

memory/3680-120-0x00000000053C0000-0x00000000053C1000-memory.dmp

Download

memory/3680-119-0x0000000002D90000-0x0000000002D91000-memory.dmp

Download

memory/3680-114-0x0000000000B10000-0x0000000000B11000-memory.dmp

Download

memory/3680-117-0x0000000002D00000-0x0000000002D02000-memory.dmp

Download

memory/3680-116-0x00000000057F0000-0x00000000057F1000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads