oski | 37f87d9529b496054bc82c319a8908fc82f7704a7de3bc0353a6474995aa02e3

General

Target
2b4a1bcc464360c350c05bf9fbb18ce3.exe
Size 224KB
Sample210503-cdt1f3d9te
SHA256 37f87d9529b496054bc82c319a8908fc82f7704a7de3bc0353a6474995aa02e3
MD5 2b4a1bcc464360c350c05bf9fbb18ce3
SHA1 62ddaabfa34733a114afd3668c29feaf9dc96502
SHA512 a230b489936b0c1b90922f9e49f02bf8addf605923ba0b5e92633ee93fd34eec6f479e4e995ddb6149aae461d262d396d5d20bf45e88f41a8f14bb762d9c420f
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

Loads dropped DLL 3 IoCs

pid	Process
3548	2b4a1bcc464360c350c05bf9fbb18ce3.exe
3548	2b4a1bcc464360c350c05bf9fbb18ce3.exe
3548	2b4a1bcc464360c350c05bf9fbb18ce3.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 3200 set thread context of 3548	3200	2b4a1bcc464360c350c05bf9fbb18ce3.exe	80

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	2b4a1bcc464360c350c05bf9fbb18ce3.exe

Kills process with taskkill 1 IoCs

evasion

pid	Process
3988	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
3200	2b4a1bcc464360c350c05bf9fbb18ce3.exe
3200	2b4a1bcc464360c350c05bf9fbb18ce3.exe
3200	2b4a1bcc464360c350c05bf9fbb18ce3.exe
3200	2b4a1bcc464360c350c05bf9fbb18ce3.exe
3200	2b4a1bcc464360c350c05bf9fbb18ce3.exe
3200	2b4a1bcc464360c350c05bf9fbb18ce3.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3200	2b4a1bcc464360c350c05bf9fbb18ce3.exe
Token: SeDebugPrivilege	3988	taskkill.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 3200 wrote to memory of 1540	3200	2b4a1bcc464360c350c05bf9fbb18ce3.exe	79
PID 3200 wrote to memory of 1540	3200	2b4a1bcc464360c350c05bf9fbb18ce3.exe	79
PID 3200 wrote to memory of 1540	3200	2b4a1bcc464360c350c05bf9fbb18ce3.exe	79
PID 3200 wrote to memory of 3548	3200	2b4a1bcc464360c350c05bf9fbb18ce3.exe	80
PID 3200 wrote to memory of 3548	3200	2b4a1bcc464360c350c05bf9fbb18ce3.exe	80
PID 3200 wrote to memory of 3548	3200	2b4a1bcc464360c350c05bf9fbb18ce3.exe	80
PID 3200 wrote to memory of 3548	3200	2b4a1bcc464360c350c05bf9fbb18ce3.exe	80
PID 3200 wrote to memory of 3548	3200	2b4a1bcc464360c350c05bf9fbb18ce3.exe	80
PID 3200 wrote to memory of 3548	3200	2b4a1bcc464360c350c05bf9fbb18ce3.exe	80
PID 3200 wrote to memory of 3548	3200	2b4a1bcc464360c350c05bf9fbb18ce3.exe	80
PID 3200 wrote to memory of 3548	3200	2b4a1bcc464360c350c05bf9fbb18ce3.exe	80
PID 3200 wrote to memory of 3548	3200	2b4a1bcc464360c350c05bf9fbb18ce3.exe	80
PID 3548 wrote to memory of 3724	3548	2b4a1bcc464360c350c05bf9fbb18ce3.exe	81
PID 3548 wrote to memory of 3724	3548	2b4a1bcc464360c350c05bf9fbb18ce3.exe	81
PID 3548 wrote to memory of 3724	3548	2b4a1bcc464360c350c05bf9fbb18ce3.exe	81
PID 3724 wrote to memory of 3988	3724	cmd.exe	83
PID 3724 wrote to memory of 3988	3724	cmd.exe	83
PID 3724 wrote to memory of 3988	3724	cmd.exe	83

C:\Users\Admin\AppData\Local\Temp\2b4a1bcc464360c350c05bf9fbb18ce3.exe
"C:\Users\Admin\AppData\Local\Temp\2b4a1bcc464360c350c05bf9fbb18ce3.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3200
- C:\Users\Admin\AppData\Local\Temp\2b4a1bcc464360c350c05bf9fbb18ce3.exe
  C:\Users\Admin\AppData\Local\Temp\2b4a1bcc464360c350c05bf9fbb18ce3.exe
  2⤵
  PID:1540
- C:\Users\Admin\AppData\Local\Temp\2b4a1bcc464360c350c05bf9fbb18ce3.exe
  C:\Users\Admin\AppData\Local\Temp\2b4a1bcc464360c350c05bf9fbb18ce3.exe
  2⤵
  - Loads dropped DLL
  - Checks processor information in registry
  - Suspicious use of WriteProcessMemory
  PID:3548
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c taskkill /pid 3548 & erase C:\Users\Admin\AppData\Local\Temp\2b4a1bcc464360c350c05bf9fbb18ce3.exe & RD /S /Q C:\\ProgramData\\093483247800150\\* & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:3724
  - - C:\Windows\SysWOW64\taskkill.exe
      taskkill /pid 3548
      4⤵
      Kills process with taskkill
      Suspicious use of AdjustPrivilegeToken
      PID:3988

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/3200-121-0x0000000005C10000-0x0000000005C2C000-memory.dmp

Download

memory/3200-119-0x0000000004B70000-0x0000000004B71000-memory.dmp

Download

memory/3200-120-0x0000000005A90000-0x0000000005A91000-memory.dmp

Download

memory/3200-114-0x0000000000260000-0x0000000000261000-memory.dmp

Download

memory/3200-118-0x00000000051A0000-0x00000000051A1000-memory.dmp

Download

memory/3200-117-0x00000000008B0000-0x00000000008B2000-memory.dmp

Download

memory/3200-116-0x0000000004C90000-0x0000000004C91000-memory.dmp

Download

memory/3548-122-0x0000000000400000-0x0000000000438000-memory.dmp

Download

memory/3548-124-0x0000000000400000-0x0000000000438000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads