oski | c210434fcb39927f4a0d0a844a1a883f8274bc3b9e6d3e6e883f8072f316ca6a

Analysis

max time kernel
149s
max time network
151s
platform
windows10_x64
resource
win10v20210410
submitted
06/05/2021, 08:01

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General

Target
IMG052361778.exe
Size 691KB
Sample210506-e5wssk39n2
SHA256 c210434fcb39927f4a0d0a844a1a883f8274bc3b9e6d3e6e883f8072f316ca6a
MD5 74a962db45d6ab6c859ff627987bf1f6
SHA1 893b19a862fca02a5ec9ab0cd270a4970849ecb1
SHA512 3a4e33f3f625e6c861eebb71a50bfbb693c102b896118d808317b546a7e6dbf28fe91b549b58d723dc27a207063a9822404ef8df3dd4a986e489b0851b1c999c
MD5 SHA1 SHA512

Score

10^/10

oski discovery infostealer spyware stealer

Malware Config

Extracted

Family

oski

193.142.59.33

Signatures

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

Loads dropped DLL 3 IoCs

pid	Process
3264	IMG052361778.exe
3264	IMG052361778.exe
3264	IMG052361778.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 4008 set thread context of 3264	4008	IMG052361778.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	IMG052361778.exe

Kills process with taskkill 1 IoCs

evasion

pid	Process
3888	taskkill.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-3686645723-710336880-414668232-1000_Classes\Local Settings	IMG052361778.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
4008	IMG052361778.exe
4008	IMG052361778.exe
4024	powershell.exe
4024	powershell.exe
4024	powershell.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	4008	IMG052361778.exe
Token: SeDebugPrivilege	4024	powershell.exe
Token: SeDebugPrivilege	3888	taskkill.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 4008 wrote to memory of 1140	4008	IMG052361778.exe	79
PID 4008 wrote to memory of 1140	4008	IMG052361778.exe	79
PID 4008 wrote to memory of 1140	4008	IMG052361778.exe	79
PID 4008 wrote to memory of 3264	4008	IMG052361778.exe	80
PID 4008 wrote to memory of 3264	4008	IMG052361778.exe	80
PID 4008 wrote to memory of 3264	4008	IMG052361778.exe	80
PID 4008 wrote to memory of 3264	4008	IMG052361778.exe	80
PID 4008 wrote to memory of 3264	4008	IMG052361778.exe	80
PID 4008 wrote to memory of 3264	4008	IMG052361778.exe	80
PID 4008 wrote to memory of 3264	4008	IMG052361778.exe	80
PID 4008 wrote to memory of 3264	4008	IMG052361778.exe	80
PID 4008 wrote to memory of 3264	4008	IMG052361778.exe	80
PID 1140 wrote to memory of 4024	1140	WScript.exe	81
PID 1140 wrote to memory of 4024	1140	WScript.exe	81
PID 1140 wrote to memory of 4024	1140	WScript.exe	81
PID 3264 wrote to memory of 3288	3264	IMG052361778.exe	83
PID 3264 wrote to memory of 3288	3264	IMG052361778.exe	83
PID 3264 wrote to memory of 3288	3264	IMG052361778.exe	83
PID 3288 wrote to memory of 3888	3288	cmd.exe	85
PID 3288 wrote to memory of 3888	3288	cmd.exe	85
PID 3288 wrote to memory of 3888	3288	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\IMG052361778.exe
"C:\Users\Admin\AppData\Local\Temp\IMG052361778.exe"
1⤵
- Suspicious use of SetThreadContext
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4008
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\zIxmnitlaifc.vbs"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1140
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath C:\,'C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\notpad\notpad\notpad.exe'
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4024
- C:\Users\Admin\AppData\Local\Temp\IMG052361778.exe
  C:\Users\Admin\AppData\Local\Temp\IMG052361778.exe
  2⤵
  - Loads dropped DLL
  - Checks processor information in registry
  - Suspicious use of WriteProcessMemory
  PID:3264
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c taskkill /pid 3264 & erase C:\Users\Admin\AppData\Local\Temp\IMG052361778.exe & RD /S /Q C:\\ProgramData\\610923722661802\\* & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:3288
  - - C:\Windows\SysWOW64\taskkill.exe
      taskkill /pid 3264
      4⤵
      Kills process with taskkill
      Suspicious use of AdjustPrivilegeToken
      PID:3888

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

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

Replay Monitor

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Downloads

memory/3264-128-0x0000000000400000-0x0000000000438000-memory.dmp

Download

memory/3264-125-0x0000000000400000-0x0000000000438000-memory.dmp

Download

memory/4008-122-0x0000000007200000-0x000000000721C000-memory.dmp

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memory/4008-121-0x0000000006F90000-0x0000000006F91000-memory.dmp

Download

memory/4008-120-0x0000000006E90000-0x0000000006F08000-memory.dmp

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memory/4008-119-0x0000000002930000-0x0000000002931000-memory.dmp

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memory/4008-118-0x0000000004DC0000-0x0000000004DC1000-memory.dmp

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memory/4008-117-0x0000000004E30000-0x0000000004E31000-memory.dmp

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memory/4008-114-0x00000000004D0000-0x00000000004D1000-memory.dmp

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memory/4008-116-0x0000000005490000-0x0000000005491000-memory.dmp

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memory/4024-133-0x0000000007890000-0x0000000007891000-memory.dmp

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memory/4024-136-0x0000000007C60000-0x0000000007C61000-memory.dmp

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memory/4024-135-0x0000000007BF0000-0x0000000007BF1000-memory.dmp

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memory/4024-134-0x0000000007930000-0x0000000007931000-memory.dmp

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memory/4024-132-0x00000000071F0000-0x00000000071F1000-memory.dmp

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memory/4024-140-0x0000000007B80000-0x0000000007B81000-memory.dmp

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memory/4024-142-0x0000000008470000-0x0000000008471000-memory.dmp

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memory/4024-143-0x0000000002F72000-0x0000000002F73000-memory.dmp

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memory/4024-141-0x0000000002F70000-0x0000000002F71000-memory.dmp

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memory/4024-131-0x0000000006B80000-0x0000000006B81000-memory.dmp

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memory/4024-154-0x00000000090F0000-0x0000000009123000-memory.dmp

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memory/4024-161-0x00000000090B0000-0x00000000090B1000-memory.dmp

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memory/4024-166-0x0000000009220000-0x0000000009221000-memory.dmp

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memory/4024-167-0x000000007F740000-0x000000007F741000-memory.dmp

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memory/4024-168-0x0000000002F73000-0x0000000002F74000-memory.dmp

Download

memory/4024-169-0x00000000095D0000-0x00000000095D1000-memory.dmp

Download