oski | e65c6e141516a7d76fe7c1e3bcc5433758fa627dfd6c18f65504efcfa62d4855

Analysis

max time kernel
137s
max time network
141s
platform
windows7_x64
resource
win7-en
submitted
16/09/2021, 12:42

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General

Target
Gatdhaozmwzqbfqrwgmuappjkqvltpfcxj.exe
Size 713KB
Sample210916-pxb5qagcfl
SHA256 e65c6e141516a7d76fe7c1e3bcc5433758fa627dfd6c18f65504efcfa62d4855
MD5 5d8d890614b10708afe877fb67a3e65b
SHA1 102b326899fbb5a2e6c03fcfb8e401c5c3a72f78
SHA512 79aa96244be4450cefce26a206e61365b23db218adcaab4c70be7ac8e33e9eb3d4642c5fddf96133e721d6333eb1fb67181b8269a4f824a4aecc8b2112cb5842
MD5 SHA1 SHA512

Score

10^/10

oski discovery infostealer persistence spyware stealer suricata

Malware Config

Extracted

Family

oski

103.141.138.110/p1/

Signatures

Oski
Oski is an infostealer targeting browser data, crypto wallets.
infostealer oski
suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt)
suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt)
suricata
suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer Data Exfil
suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer Data Exfil
suricata
Downloads MZ/PE file

Loads dropped DLL 5 IoCs

pid	Process
1184	Gatdhaozmwzqbfqrwgmuappjkqvltpfcxj.exe
1184	Gatdhaozmwzqbfqrwgmuappjkqvltpfcxj.exe
1184	Gatdhaozmwzqbfqrwgmuappjkqvltpfcxj.exe
1184	Gatdhaozmwzqbfqrwgmuappjkqvltpfcxj.exe
1184	Gatdhaozmwzqbfqrwgmuappjkqvltpfcxj.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

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1669990088-476967504-438132596-1000\Software\Microsoft\Windows\CurrentVersion\Run\Jepdqqdn = "C:\\Users\\Public\\Libraries\\ndqqdpeJ.url"	Gatdhaozmwzqbfqrwgmuappjkqvltpfcxj.exe

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 1992 set thread context of 1184	1992	Gatdhaozmwzqbfqrwgmuappjkqvltpfcxj.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	Gatdhaozmwzqbfqrwgmuappjkqvltpfcxj.exe

Kills process with taskkill 1 IoCs

evasion

pid	Process
1652	taskkill.exe

Modifies registry key 1 TTPs 3 IoCs

Modify Registry

T1112

pid	Process
1740	reg.exe
544	reg.exe
1600	reg.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1652	taskkill.exe

Suspicious use of WriteProcessMemory 42 IoCs

description	pid	Process	procid_target
PID 1992 wrote to memory of 1184	1992	Gatdhaozmwzqbfqrwgmuappjkqvltpfcxj.exe	28
PID 1992 wrote to memory of 1184	1992	Gatdhaozmwzqbfqrwgmuappjkqvltpfcxj.exe	28
PID 1992 wrote to memory of 1184	1992	Gatdhaozmwzqbfqrwgmuappjkqvltpfcxj.exe	28
PID 1992 wrote to memory of 1184	1992	Gatdhaozmwzqbfqrwgmuappjkqvltpfcxj.exe	28
PID 1992 wrote to memory of 1184	1992	Gatdhaozmwzqbfqrwgmuappjkqvltpfcxj.exe	28
PID 1992 wrote to memory of 1184	1992	Gatdhaozmwzqbfqrwgmuappjkqvltpfcxj.exe	28
PID 1992 wrote to memory of 1376	1992	Gatdhaozmwzqbfqrwgmuappjkqvltpfcxj.exe	29
PID 1992 wrote to memory of 1376	1992	Gatdhaozmwzqbfqrwgmuappjkqvltpfcxj.exe	29
PID 1992 wrote to memory of 1376	1992	Gatdhaozmwzqbfqrwgmuappjkqvltpfcxj.exe	29
PID 1992 wrote to memory of 1376	1992	Gatdhaozmwzqbfqrwgmuappjkqvltpfcxj.exe	29
PID 1376 wrote to memory of 1700	1376	cmd.exe	31
PID 1376 wrote to memory of 1700	1376	cmd.exe	31
PID 1376 wrote to memory of 1700	1376	cmd.exe	31
PID 1376 wrote to memory of 1700	1376	cmd.exe	31
PID 1700 wrote to memory of 1740	1700	cmd.exe	33
PID 1700 wrote to memory of 1740	1700	cmd.exe	33
PID 1700 wrote to memory of 1740	1700	cmd.exe	33
PID 1700 wrote to memory of 1740	1700	cmd.exe	33
PID 1700 wrote to memory of 544	1700	cmd.exe	34
PID 1700 wrote to memory of 544	1700	cmd.exe	34
PID 1700 wrote to memory of 544	1700	cmd.exe	34
PID 1700 wrote to memory of 544	1700	cmd.exe	34
PID 1700 wrote to memory of 1280	1700	cmd.exe	35
PID 1700 wrote to memory of 1280	1700	cmd.exe	35
PID 1700 wrote to memory of 1280	1700	cmd.exe	35
PID 1700 wrote to memory of 1280	1700	cmd.exe	35
PID 1184 wrote to memory of 1056	1184	Gatdhaozmwzqbfqrwgmuappjkqvltpfcxj.exe	36
PID 1184 wrote to memory of 1056	1184	Gatdhaozmwzqbfqrwgmuappjkqvltpfcxj.exe	36
PID 1184 wrote to memory of 1056	1184	Gatdhaozmwzqbfqrwgmuappjkqvltpfcxj.exe	36
PID 1184 wrote to memory of 1056	1184	Gatdhaozmwzqbfqrwgmuappjkqvltpfcxj.exe	36
PID 1056 wrote to memory of 1652	1056	cmd.exe	38
PID 1056 wrote to memory of 1652	1056	cmd.exe	38
PID 1056 wrote to memory of 1652	1056	cmd.exe	38
PID 1056 wrote to memory of 1652	1056	cmd.exe	38
PID 1992 wrote to memory of 1856	1992	Gatdhaozmwzqbfqrwgmuappjkqvltpfcxj.exe	39
PID 1992 wrote to memory of 1856	1992	Gatdhaozmwzqbfqrwgmuappjkqvltpfcxj.exe	39
PID 1992 wrote to memory of 1856	1992	Gatdhaozmwzqbfqrwgmuappjkqvltpfcxj.exe	39
PID 1992 wrote to memory of 1856	1992	Gatdhaozmwzqbfqrwgmuappjkqvltpfcxj.exe	39
PID 1856 wrote to memory of 1600	1856	cmd.exe	41
PID 1856 wrote to memory of 1600	1856	cmd.exe	41
PID 1856 wrote to memory of 1600	1856	cmd.exe	41
PID 1856 wrote to memory of 1600	1856	cmd.exe	41

C:\Users\Admin\AppData\Local\Temp\Gatdhaozmwzqbfqrwgmuappjkqvltpfcxj.exe
"C:\Users\Admin\AppData\Local\Temp\Gatdhaozmwzqbfqrwgmuappjkqvltpfcxj.exe"
1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1992
- C:\Users\Admin\AppData\Local\Temp\Gatdhaozmwzqbfqrwgmuappjkqvltpfcxj.exe
  C:\Users\Admin\AppData\Local\Temp\Gatdhaozmwzqbfqrwgmuappjkqvltpfcxj.exe
  2⤵
  - Loads dropped DLL
  - Checks processor information in registry
  - Suspicious use of WriteProcessMemory
  PID:1184
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c taskkill /pid 1184 & erase C:\Users\Admin\AppData\Local\Temp\Gatdhaozmwzqbfqrwgmuappjkqvltpfcxj.exe & RD /S /Q C:\\ProgramData\\945914959348235\\* & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1056
  - - C:\Windows\SysWOW64\taskkill.exe
      taskkill /pid 1184
      4⤵
      Kills process with taskkill
      Suspicious use of AdjustPrivilegeToken
      PID:1652
- C:\Windows\SysWOW64\cmd.exe
  cmd /c ""C:\Users\Public\Trast.bat" "
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1376
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /K C:\Users\Public\UKO.bat
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1700
  - - C:\Windows\SysWOW64\reg.exe
      reg delete hkcu\Environment /v windir /f
      4⤵
      Modifies registry key
      PID:1740
  - - C:\Windows\SysWOW64\reg.exe
      reg add hkcu\Environment /v windir /d "cmd /c start /min C:\Users\Public\KDECO.bat reg delete hkcu\Environment /v windir /f && REM "
      4⤵
      Modifies registry key
      PID:544
  - - C:\Windows\SysWOW64\schtasks.exe
      schtasks /Run /TN \Microsoft\Windows\DiskCleanup\SilentCleanup /I
      4⤵
      PID:1280
- C:\Windows\SysWOW64\cmd.exe
  cmd /c ""C:\Users\Public\nest.bat" "
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1856
- - C:\Windows\SysWOW64\reg.exe
    reg delete hkcu\Environment /v windir /f
    3⤵
    - Modifies registry key
    PID:1600

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Credentials in Files

T1081

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

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Downloads

memory/1184-64-0x0000000000400000-0x0000000000438000-memory.dmp

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memory/1184-54-0x0000000000400000-0x0000000000438000-memory.dmp

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memory/1992-53-0x0000000075351000-0x0000000075353000-memory.dmp

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memory/1992-52-0x00000000001B0000-0x00000000001B1000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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