Malware Analysis Report

2024-09-22 21:52

Sample ID 240124-kcww6sead3
Target 71bfac3bfe6334641627a8684d3fe6ee
SHA256 425e0a263cf872e96f3f9cc40215268b94148054577c3aa238af64333d489f4e
Tags
oski infostealer
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK Matrix

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

425e0a263cf872e96f3f9cc40215268b94148054577c3aa238af64333d489f4e

Threat Level: Known bad

The file 71bfac3bfe6334641627a8684d3fe6ee was found to be: Known bad.

Malicious Activity Summary

oski infostealer

Oski

Suspicious use of SetThreadContext

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

Suspicious behavior: EnumeratesProcesses

MITRE ATT&CK Matrix

N/A

Analysis: static1

Detonation Overview

Reported

2024-01-24 08:27

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-01-24 08:27

Reported

2024-01-24 08:30

Platform

win7-20231129-en

Max time kernel

149s

Max time network

150s

Command Line

powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\71bfac3bfe6334641627a8684d3fe6ee.ps1

Signatures

Oski

infostealer oski

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 2548 set thread context of 2824 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2548 wrote to memory of 2556 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
PID 2548 wrote to memory of 2556 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
PID 2548 wrote to memory of 2556 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
PID 2548 wrote to memory of 2556 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
PID 2548 wrote to memory of 2556 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
PID 2548 wrote to memory of 2556 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
PID 2548 wrote to memory of 2556 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
PID 2548 wrote to memory of 2824 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
PID 2548 wrote to memory of 2824 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
PID 2548 wrote to memory of 2824 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
PID 2548 wrote to memory of 2824 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
PID 2548 wrote to memory of 2824 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
PID 2548 wrote to memory of 2824 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
PID 2548 wrote to memory of 2824 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
PID 2548 wrote to memory of 2824 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
PID 2548 wrote to memory of 2824 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
PID 2548 wrote to memory of 2824 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
PID 2548 wrote to memory of 2824 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
PID 2548 wrote to memory of 2824 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
PID 2548 wrote to memory of 2824 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe

Processes

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe

powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\71bfac3bfe6334641627a8684d3fe6ee.ps1

C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe

"C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe"

C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe

"C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe"

Network

Country Destination Domain Proto
VN 103.99.1.60:80 tcp
VN 103.99.1.60:80 tcp
VN 103.99.1.60:80 tcp
VN 103.99.1.60:80 tcp
VN 103.99.1.60:80 tcp
VN 103.99.1.60:80 tcp
VN 103.99.1.60:80 tcp
VN 103.99.1.60:80 tcp

Files

memory/2548-5-0x000007FEF5BF0000-0x000007FEF658D000-memory.dmp

memory/2548-4-0x000000001B770000-0x000000001BA52000-memory.dmp

memory/2548-7-0x0000000002E40000-0x0000000002EC0000-memory.dmp

memory/2548-6-0x0000000002860000-0x0000000002868000-memory.dmp

memory/2548-9-0x0000000002E40000-0x0000000002EC0000-memory.dmp

memory/2548-10-0x0000000002E40000-0x0000000002EC0000-memory.dmp

memory/2548-8-0x000007FEF5BF0000-0x000007FEF658D000-memory.dmp

memory/2548-11-0x0000000002E40000-0x0000000002EC0000-memory.dmp

memory/2548-12-0x0000000002CF0000-0x0000000002CF8000-memory.dmp

memory/2548-22-0x000007FEF5BF0000-0x000007FEF658D000-memory.dmp

memory/2824-23-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2824-21-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2824-19-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2824-18-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

memory/2824-17-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2824-16-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2824-15-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2824-14-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2824-13-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2824-24-0x0000000000400000-0x0000000000438000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-01-24 08:27

Reported

2024-01-24 08:30

Platform

win10v2004-20231215-en

Max time kernel

137s

Max time network

162s

Command Line

powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\71bfac3bfe6334641627a8684d3fe6ee.ps1

Signatures

Oski

infostealer oski

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 5020 set thread context of 4600 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
N/A N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A

Processes

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe

powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\71bfac3bfe6334641627a8684d3fe6ee.ps1

C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe

"C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 217.106.137.52.in-addr.arpa udp
US 8.8.8.8:53 209.178.17.96.in-addr.arpa udp
VN 103.99.1.60:80 tcp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 241.150.49.20.in-addr.arpa udp
US 8.8.8.8:53 22.160.190.20.in-addr.arpa udp
US 138.91.171.81:80 tcp
US 8.8.8.8:53 157.123.68.40.in-addr.arpa udp
VN 103.99.1.60:80 tcp
US 8.8.8.8:53 198.187.3.20.in-addr.arpa udp
VN 103.99.1.60:80 tcp
US 8.8.8.8:53 187.178.17.96.in-addr.arpa udp
VN 103.99.1.60:80 tcp
VN 103.99.1.60:80 tcp
VN 103.99.1.60:80 tcp
US 8.8.8.8:53 169.117.168.52.in-addr.arpa udp
VN 103.99.1.60:80 tcp

Files

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_dtdkof4h.fjw.ps1

MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

memory/5020-9-0x0000013CA9140000-0x0000013CA9162000-memory.dmp

memory/5020-10-0x00007FFEBD1F0000-0x00007FFEBDCB1000-memory.dmp

memory/5020-11-0x0000013C8E990000-0x0000013C8E9A0000-memory.dmp

memory/5020-12-0x0000013C8E990000-0x0000013C8E9A0000-memory.dmp

memory/5020-13-0x0000013C8E990000-0x0000013C8E9A0000-memory.dmp

memory/5020-14-0x0000013CA9130000-0x0000013CA9138000-memory.dmp

memory/4600-15-0x0000000000400000-0x0000000000438000-memory.dmp

memory/5020-18-0x00007FFEBD1F0000-0x00007FFEBDCB1000-memory.dmp

memory/4600-19-0x0000000000400000-0x0000000000438000-memory.dmp

memory/4600-20-0x0000000000400000-0x0000000000438000-memory.dmp

memory/4600-21-0x0000000000400000-0x0000000000438000-memory.dmp

memory/4600-22-0x0000000000400000-0x0000000000438000-memory.dmp