oski | 2e6bebcaaa746b7ab28bf74c49dc0b92b88f564f5b05d6cc414ea1d4aa5f10d4

General

Target
5c40517b3b632caf07cb45afa5aa1140.exe
Size 1.0MB
Sample211207-p74byscbg9
SHA256 2e6bebcaaa746b7ab28bf74c49dc0b92b88f564f5b05d6cc414ea1d4aa5f10d4
MD5 5c40517b3b632caf07cb45afa5aa1140
SHA1 767c28385881fdc01b43b730aa50168f23d934f9
SHA512 049ad3a0c2b806a6ce30e64bf4fb8d0f77adf208b7eca9c80579e9d25faa464981eb2c6631ca93955962c36a3c6f40cb1f20d3ed542f994d02ce85d3d3af4713
MD5 SHA1 SHA512

Score

10^/10

oski discovery infostealer spyware stealer

Malware Config

Extracted

Family

oski

C2

oilproduce.xyz

Signatures

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

Deletes itself 1 IoCs

pid	Process
1628	cmd.exe

Loads dropped DLL 5 IoCs

pid	Process
552	5c40517b3b632caf07cb45afa5aa1140.exe
552	5c40517b3b632caf07cb45afa5aa1140.exe
552	5c40517b3b632caf07cb45afa5aa1140.exe
552	5c40517b3b632caf07cb45afa5aa1140.exe
552	5c40517b3b632caf07cb45afa5aa1140.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 1696 set thread context of 552	1696	5c40517b3b632caf07cb45afa5aa1140.exe	28

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	5c40517b3b632caf07cb45afa5aa1140.exe

Kills process with taskkill 1 IoCs

evasion

pid	Process
1908	taskkill.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1908	taskkill.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 1696 wrote to memory of 552	1696	5c40517b3b632caf07cb45afa5aa1140.exe	28
PID 1696 wrote to memory of 552	1696	5c40517b3b632caf07cb45afa5aa1140.exe	28
PID 1696 wrote to memory of 552	1696	5c40517b3b632caf07cb45afa5aa1140.exe	28
PID 1696 wrote to memory of 552	1696	5c40517b3b632caf07cb45afa5aa1140.exe	28
PID 1696 wrote to memory of 552	1696	5c40517b3b632caf07cb45afa5aa1140.exe	28
PID 1696 wrote to memory of 552	1696	5c40517b3b632caf07cb45afa5aa1140.exe	28
PID 1696 wrote to memory of 552	1696	5c40517b3b632caf07cb45afa5aa1140.exe	28
PID 1696 wrote to memory of 552	1696	5c40517b3b632caf07cb45afa5aa1140.exe	28
PID 1696 wrote to memory of 552	1696	5c40517b3b632caf07cb45afa5aa1140.exe	28
PID 1696 wrote to memory of 552	1696	5c40517b3b632caf07cb45afa5aa1140.exe	28
PID 552 wrote to memory of 1628	552	5c40517b3b632caf07cb45afa5aa1140.exe	31
PID 552 wrote to memory of 1628	552	5c40517b3b632caf07cb45afa5aa1140.exe	31
PID 552 wrote to memory of 1628	552	5c40517b3b632caf07cb45afa5aa1140.exe	31
PID 552 wrote to memory of 1628	552	5c40517b3b632caf07cb45afa5aa1140.exe	31
PID 1628 wrote to memory of 1908	1628	cmd.exe	33
PID 1628 wrote to memory of 1908	1628	cmd.exe	33
PID 1628 wrote to memory of 1908	1628	cmd.exe	33
PID 1628 wrote to memory of 1908	1628	cmd.exe	33

C:\Users\Admin\AppData\Local\Temp\5c40517b3b632caf07cb45afa5aa1140.exe
"C:\Users\Admin\AppData\Local\Temp\5c40517b3b632caf07cb45afa5aa1140.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1696
- C:\Users\Admin\AppData\Local\Temp\5c40517b3b632caf07cb45afa5aa1140.exe
  "C:\Users\Admin\AppData\Local\Temp\5c40517b3b632caf07cb45afa5aa1140.exe"
  2⤵
  - Loads dropped DLL
  - Checks processor information in registry
  - Suspicious use of WriteProcessMemory
  PID:552
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c taskkill /pid 552 & erase C:\Users\Admin\AppData\Local\Temp\5c40517b3b632caf07cb45afa5aa1140.exe & RD /S /Q C:\\ProgramData\\978622128514480\\* & exit
    3⤵
    - Deletes itself
    - Suspicious use of WriteProcessMemory
    PID:1628
  - - C:\Windows\SysWOW64\taskkill.exe
      taskkill /pid 552
      4⤵
      Kills process with taskkill
      Suspicious use of AdjustPrivilegeToken
      PID:1908

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/552-61-0x0000000000400000-0x0000000000438000-memory.dmp

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memory/552-69-0x0000000000400000-0x0000000000438000-memory.dmp

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memory/552-63-0x0000000000400000-0x0000000000438000-memory.dmp

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memory/552-64-0x0000000000400000-0x0000000000438000-memory.dmp

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memory/552-65-0x0000000000400000-0x0000000000438000-memory.dmp

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memory/552-66-0x0000000000400000-0x0000000000438000-memory.dmp

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memory/552-62-0x0000000000400000-0x0000000000438000-memory.dmp

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memory/1696-55-0x0000000000C60000-0x0000000000C61000-memory.dmp

Download

memory/1696-60-0x0000000005590000-0x00000000056B2000-memory.dmp

Download

memory/1696-59-0x0000000000410000-0x0000000000415000-memory.dmp

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memory/1696-58-0x0000000004D10000-0x0000000004D11000-memory.dmp

Download

memory/1696-57-0x0000000075D01000-0x0000000075D03000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads