oski | 091fb99d751df7e9e867422f401ff7181adc35c6f90ad2c8aafd54e3ec724771

General

Target
New Bank Details.exe
Size 689KB
Sample210907-h4e2mafddn
SHA256 091fb99d751df7e9e867422f401ff7181adc35c6f90ad2c8aafd54e3ec724771
MD5 bbb6126304164468a0391e475be41aa0
SHA1 a7de5d41291af39b594698220bfaf27d23717428
SHA512 d3a7aa913f076053890718ff1251e982f0dbdbfd2c886cdfe0e60de51540dcbbd9c12332c5894b3cce7a04b3b00049a0fb52fbc8dafcc9d2c6276eb5f2794d8c
MD5 SHA1 SHA512

Score

10^/10

oski infostealer spyware suricata

Malware Config

Extracted

Family

oski

C2

http://bctpump.us

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
1116	RegSvcs.exe
1116	RegSvcs.exe
1116	RegSvcs.exe
1116	RegSvcs.exe
1116	RegSvcs.exe

Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
spyware

Data from Local System
T1005

Credentials in Files
T1081

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 736 set thread context of 1116	736	New Bank Details.exe	30

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	RegSvcs.exe

Kills process with taskkill 1 IoCs

evasion

pid	Process
2024	taskkill.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
736	New Bank Details.exe
736	New Bank Details.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	736	New Bank Details.exe
Token: SeDebugPrivilege	2024	taskkill.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 736 wrote to memory of 1116	736	New Bank Details.exe	30
PID 736 wrote to memory of 1116	736	New Bank Details.exe	30
PID 736 wrote to memory of 1116	736	New Bank Details.exe	30
PID 736 wrote to memory of 1116	736	New Bank Details.exe	30
PID 736 wrote to memory of 1116	736	New Bank Details.exe	30
PID 736 wrote to memory of 1116	736	New Bank Details.exe	30
PID 736 wrote to memory of 1116	736	New Bank Details.exe	30
PID 736 wrote to memory of 1116	736	New Bank Details.exe	30
PID 736 wrote to memory of 1116	736	New Bank Details.exe	30
PID 736 wrote to memory of 1116	736	New Bank Details.exe	30
PID 736 wrote to memory of 1116	736	New Bank Details.exe	30
PID 736 wrote to memory of 1116	736	New Bank Details.exe	30
PID 736 wrote to memory of 1116	736	New Bank Details.exe	30
PID 1116 wrote to memory of 1236	1116	RegSvcs.exe	33
PID 1116 wrote to memory of 1236	1116	RegSvcs.exe	33
PID 1116 wrote to memory of 1236	1116	RegSvcs.exe	33
PID 1116 wrote to memory of 1236	1116	RegSvcs.exe	33
PID 1236 wrote to memory of 2024	1236	cmd.exe	35
PID 1236 wrote to memory of 2024	1236	cmd.exe	35
PID 1236 wrote to memory of 2024	1236	cmd.exe	35
PID 1236 wrote to memory of 2024	1236	cmd.exe	35

C:\Users\Admin\AppData\Local\Temp\New Bank Details.exe
"C:\Users\Admin\AppData\Local\Temp\New Bank Details.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:736
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe"
  2⤵
  - Loads dropped DLL
  - Checks processor information in registry
  - Suspicious use of WriteProcessMemory
  PID:1116
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c taskkill /pid 1116 & erase C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe & RD /S /Q C:\\ProgramData\\740467309005442\\* & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1236
  - - C:\Windows\SysWOW64\taskkill.exe
      taskkill /pid 1116
      4⤵
      Kills process with taskkill
      Suspicious use of AdjustPrivilegeToken
      PID:2024

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials in Files

1

T1081

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Data from Local System

1

T1005

Command and Control

Exfiltration

Impact

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Downloads

memory/736-58-0x00000000048D0000-0x0000000004904000-memory.dmp

Download

memory/736-53-0x00000000013A0000-0x00000000013A1000-memory.dmp

Download

memory/736-57-0x0000000000C00000-0x0000000000C64000-memory.dmp

Download

memory/736-56-0x0000000000390000-0x00000000003A6000-memory.dmp

Download

memory/736-55-0x0000000004E20000-0x0000000004E21000-memory.dmp

Download

memory/1116-59-0x0000000000400000-0x0000000000438000-memory.dmp

Download

memory/1116-61-0x0000000075E51000-0x0000000075E53000-memory.dmp

Download

memory/1116-62-0x0000000000400000-0x0000000000438000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads