oski | b43dde5ca3d23d16af5bf34c522869dff9624a78be67dfc3acde5c81ef24d318

Analysis

max time kernel
70s
max time network
137s
platform
windows10_x64
resource
win10-en-20210920
submitted
17/10/2021, 11:16

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General

Target
Bank account confirmation.exe
Size 1.2MB
Sample211017-nc5qvsdddm
SHA256 b43dde5ca3d23d16af5bf34c522869dff9624a78be67dfc3acde5c81ef24d318
MD5 1fbf4813a6c6fd9c55e8f8c8beb200f3
SHA1 648e3959c35790655ebaddd1bec2902938cdd540
SHA512 bffb6f378b581650ed74b6e00b28178a94b4584bf841d774bb867debb7b54dd1396c1ae33159c02301b334e8576958836740515efc17a362f56578ac31e7638f
MD5 SHA1 SHA512

Score

10^/10

oski discovery infostealer spyware stealer

Malware Config

Extracted

Family

oski

secureconnection.xyz

Signatures

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

Loads dropped DLL 3 IoCs

pid	Process
432	Bank account confirmation.exe
432	Bank account confirmation.exe
432	Bank account confirmation.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 3608 set thread context of 432	3608	Bank account confirmation.exe	74

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	Bank account confirmation.exe

Creates scheduled task(s) 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task

T1053

pid	Process
868	schtasks.exe

Kills process with taskkill 1 IoCs

evasion

pid	Process
2720	taskkill.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
3608	Bank account confirmation.exe
3608	Bank account confirmation.exe
496	powershell.exe
496	powershell.exe
496	powershell.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	3608	Bank account confirmation.exe
Token: SeDebugPrivilege	496	powershell.exe
Token: SeDebugPrivilege	2720	taskkill.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 3608 wrote to memory of 496	3608	Bank account confirmation.exe	71
PID 3608 wrote to memory of 496	3608	Bank account confirmation.exe	71
PID 3608 wrote to memory of 496	3608	Bank account confirmation.exe	71
PID 3608 wrote to memory of 868	3608	Bank account confirmation.exe	73
PID 3608 wrote to memory of 868	3608	Bank account confirmation.exe	73
PID 3608 wrote to memory of 868	3608	Bank account confirmation.exe	73
PID 3608 wrote to memory of 432	3608	Bank account confirmation.exe	74
PID 3608 wrote to memory of 432	3608	Bank account confirmation.exe	74
PID 3608 wrote to memory of 432	3608	Bank account confirmation.exe	74
PID 3608 wrote to memory of 432	3608	Bank account confirmation.exe	74
PID 3608 wrote to memory of 432	3608	Bank account confirmation.exe	74
PID 3608 wrote to memory of 432	3608	Bank account confirmation.exe	74
PID 3608 wrote to memory of 432	3608	Bank account confirmation.exe	74
PID 3608 wrote to memory of 432	3608	Bank account confirmation.exe	74
PID 3608 wrote to memory of 432	3608	Bank account confirmation.exe	74
PID 432 wrote to memory of 2424	432	Bank account confirmation.exe	76
PID 432 wrote to memory of 2424	432	Bank account confirmation.exe	76
PID 432 wrote to memory of 2424	432	Bank account confirmation.exe	76
PID 2424 wrote to memory of 2720	2424	cmd.exe	78
PID 2424 wrote to memory of 2720	2424	cmd.exe	78
PID 2424 wrote to memory of 2720	2424	cmd.exe	78

C:\Users\Admin\AppData\Local\Temp\Bank account confirmation.exe
"C:\Users\Admin\AppData\Local\Temp\Bank account confirmation.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3608
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Local\Temp\Bank account confirmation.exe"
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:496
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\VWSIPxIbJ" /XML "C:\Users\Admin\AppData\Local\Temp\tmp4BDA.tmp"
  2⤵
  - Creates scheduled task(s)
  PID:868
- C:\Users\Admin\AppData\Local\Temp\Bank account confirmation.exe
  "C:\Users\Admin\AppData\Local\Temp\Bank account confirmation.exe"
  2⤵
  - Loads dropped DLL
  - Checks processor information in registry
  - Suspicious use of WriteProcessMemory
  PID:432
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c taskkill /pid 432 & erase C:\Users\Admin\AppData\Local\Temp\Bank account confirmation.exe & RD /S /Q C:\\ProgramData\\396851298397845\\* & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2424
  - - C:\Windows\SysWOW64\taskkill.exe
      taskkill /pid 432
      4⤵
      Kills process with taskkill
      Suspicious use of AdjustPrivilegeToken
      PID:2720

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

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

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Downloads

memory/432-129-0x0000000000400000-0x0000000000438000-memory.dmp

Download

memory/432-126-0x0000000000400000-0x0000000000438000-memory.dmp

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memory/496-134-0x0000000007630000-0x0000000007631000-memory.dmp

Download

memory/496-144-0x0000000007EF0000-0x0000000007EF1000-memory.dmp

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memory/496-237-0x00000000043E3000-0x00000000043E4000-memory.dmp

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memory/496-168-0x00000000091F0000-0x00000000091F1000-memory.dmp

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memory/496-167-0x000000007E750000-0x000000007E751000-memory.dmp

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memory/496-130-0x0000000002AC0000-0x0000000002AC1000-memory.dmp

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memory/496-128-0x0000000002AC0000-0x0000000002AC1000-memory.dmp

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memory/496-166-0x0000000009030000-0x0000000009031000-memory.dmp

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memory/496-131-0x00000000067A0000-0x00000000067A1000-memory.dmp

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memory/496-132-0x0000000006E10000-0x0000000006E11000-memory.dmp

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memory/496-133-0x00000000074B0000-0x00000000074B1000-memory.dmp

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memory/496-161-0x0000000008EC0000-0x0000000008EC1000-memory.dmp

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memory/496-135-0x00000000077A0000-0x00000000077A1000-memory.dmp

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memory/496-136-0x0000000007930000-0x0000000007931000-memory.dmp

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memory/496-137-0x00000000075B0000-0x00000000075B1000-memory.dmp

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memory/496-139-0x00000000043E0000-0x00000000043E1000-memory.dmp

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memory/496-138-0x0000000007FE0000-0x0000000007FE1000-memory.dmp

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memory/496-140-0x00000000043E2000-0x00000000043E3000-memory.dmp

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memory/496-154-0x0000000008F00000-0x0000000008F33000-memory.dmp

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memory/496-145-0x0000000002AC0000-0x0000000002AC1000-memory.dmp

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memory/3608-117-0x0000000005CF0000-0x0000000005CF1000-memory.dmp

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memory/3608-123-0x0000000007C50000-0x0000000007D15000-memory.dmp

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memory/3608-118-0x00000000056E0000-0x00000000056E1000-memory.dmp

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memory/3608-119-0x00000000057F0000-0x0000000005CEE000-memory.dmp

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memory/3608-115-0x0000000000D50000-0x0000000000D51000-memory.dmp

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memory/3608-120-0x00000000056B0000-0x00000000056B1000-memory.dmp

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memory/3608-121-0x0000000007310000-0x0000000007311000-memory.dmp

Download

memory/3608-122-0x0000000005B80000-0x0000000005B85000-memory.dmp

Download