oski | 930ad6fbbfbac743f4097748a7af399d3fbb61b1ba36bc6230803dcdfb357640

Analysis

max time kernel
85s
max time network
147s
platform
windows10_x64
resource
win10-en
submitted
17/09/2021, 09:36

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General

Target
16e153201be41825d56aaeac47183efd.exe
Size 812KB
Sample210917-lkz48saagl
SHA256 930ad6fbbfbac743f4097748a7af399d3fbb61b1ba36bc6230803dcdfb357640
MD5 16e153201be41825d56aaeac47183efd
SHA1 980367f1702c355961144c8f5cd6444c1f58baa8
SHA512 c0c75f37cc18074a29ddb9013692fe903e9d6e6af87210093137352ef5f6f653a4a14adf3799e585117e22b9707a2f9eaf5030e1aa703edbae1c3c641f55616a
MD5 SHA1 SHA512

Score

10^/10

oski discovery infostealer persistence spyware stealer suricata

Malware Config

Extracted

Family

oski

103.141.138.110/p2/

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 3 IoCs

pid	Process
3776	16e153201be41825d56aaeac47183efd.exe
3776	16e153201be41825d56aaeac47183efd.exe
3776	16e153201be41825d56aaeac47183efd.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-1-5-21-2559286294-2439613352-4032193287-1000\Software\Microsoft\Windows\CurrentVersion\Run\Ymwqrsx = "C:\\Users\\Public\\Libraries\\xsrqwmY.url"	16e153201be41825d56aaeac47183efd.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 1584 set thread context of 3776	1584	16e153201be41825d56aaeac47183efd.exe	69

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	16e153201be41825d56aaeac47183efd.exe

Kills process with taskkill 1 IoCs

evasion

pid	Process
368	taskkill.exe

Modifies registry key 1 TTPs 3 IoCs

Modify Registry

T1112

pid	Process
3932	reg.exe
808	reg.exe
1108	reg.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	368	taskkill.exe

Suspicious use of WriteProcessMemory 32 IoCs

description	pid	Process	procid_target
PID 1584 wrote to memory of 3776	1584	16e153201be41825d56aaeac47183efd.exe	69
PID 1584 wrote to memory of 3776	1584	16e153201be41825d56aaeac47183efd.exe	69
PID 1584 wrote to memory of 3776	1584	16e153201be41825d56aaeac47183efd.exe	69
PID 1584 wrote to memory of 3776	1584	16e153201be41825d56aaeac47183efd.exe	69
PID 1584 wrote to memory of 3776	1584	16e153201be41825d56aaeac47183efd.exe	69
PID 1584 wrote to memory of 3840	1584	16e153201be41825d56aaeac47183efd.exe	70
PID 1584 wrote to memory of 3840	1584	16e153201be41825d56aaeac47183efd.exe	70
PID 1584 wrote to memory of 3840	1584	16e153201be41825d56aaeac47183efd.exe	70
PID 3840 wrote to memory of 3248	3840	cmd.exe	72
PID 3840 wrote to memory of 3248	3840	cmd.exe	72
PID 3840 wrote to memory of 3248	3840	cmd.exe	72
PID 3248 wrote to memory of 3932	3248	cmd.exe	74
PID 3248 wrote to memory of 3932	3248	cmd.exe	74
PID 3248 wrote to memory of 3932	3248	cmd.exe	74
PID 3248 wrote to memory of 808	3248	cmd.exe	75
PID 3248 wrote to memory of 808	3248	cmd.exe	75
PID 3248 wrote to memory of 808	3248	cmd.exe	75
PID 3248 wrote to memory of 3872	3248	cmd.exe	76
PID 3248 wrote to memory of 3872	3248	cmd.exe	76
PID 3248 wrote to memory of 3872	3248	cmd.exe	76
PID 3776 wrote to memory of 4064	3776	16e153201be41825d56aaeac47183efd.exe	77
PID 3776 wrote to memory of 4064	3776	16e153201be41825d56aaeac47183efd.exe	77
PID 3776 wrote to memory of 4064	3776	16e153201be41825d56aaeac47183efd.exe	77
PID 1584 wrote to memory of 636	1584	16e153201be41825d56aaeac47183efd.exe	79
PID 1584 wrote to memory of 636	1584	16e153201be41825d56aaeac47183efd.exe	79
PID 1584 wrote to memory of 636	1584	16e153201be41825d56aaeac47183efd.exe	79
PID 4064 wrote to memory of 368	4064	cmd.exe	81
PID 4064 wrote to memory of 368	4064	cmd.exe	81
PID 4064 wrote to memory of 368	4064	cmd.exe	81
PID 636 wrote to memory of 1108	636	cmd.exe	82
PID 636 wrote to memory of 1108	636	cmd.exe	82
PID 636 wrote to memory of 1108	636	cmd.exe	82

C:\Users\Admin\AppData\Local\Temp\16e153201be41825d56aaeac47183efd.exe
"C:\Users\Admin\AppData\Local\Temp\16e153201be41825d56aaeac47183efd.exe"
1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1584
- C:\Users\Admin\AppData\Local\Temp\16e153201be41825d56aaeac47183efd.exe
  C:\Users\Admin\AppData\Local\Temp\16e153201be41825d56aaeac47183efd.exe
  2⤵
  - Loads dropped DLL
  - Checks processor information in registry
  - Suspicious use of WriteProcessMemory
  PID:3776
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c taskkill /pid 3776 & erase C:\Users\Admin\AppData\Local\Temp\16e153201be41825d56aaeac47183efd.exe & RD /S /Q C:\\ProgramData\\195642753392066\\* & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4064
  - - C:\Windows\SysWOW64\taskkill.exe
      taskkill /pid 3776
      4⤵
      Kills process with taskkill
      Suspicious use of AdjustPrivilegeToken
      PID:368
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Public\Trast.bat" "
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3840
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /K C:\Users\Public\UKO.bat
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:3248
  - - C:\Windows\SysWOW64\reg.exe
      reg delete hkcu\Environment /v windir /f
      4⤵
      Modifies registry key
      PID:3932
  - - 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:808
  - - C:\Windows\SysWOW64\schtasks.exe
      schtasks /Run /TN \Microsoft\Windows\DiskCleanup\SilentCleanup /I
      4⤵
      PID:3872
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Public\nest.bat" "
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:636
- - C:\Windows\SysWOW64\reg.exe
    reg delete hkcu\Environment /v windir /f
    3⤵
    - Modifies registry key
    PID:1108

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/1584-115-0x00000000005F0000-0x000000000073A000-memory.dmp

Download

memory/3776-126-0x0000000000400000-0x0000000000438000-memory.dmp

Download

memory/3776-119-0x0000000000400000-0x0000000000438000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads