Malware Analysis Report

2024-09-22 21:53

Sample ID 240311-f9mybach72
Target bff92dc80413fbf07cac532191df5832
SHA256 231ac4cf73a42ea2dc3fb6fc6c708a1288322ce9c98098d3e6f1b100c2c0b3d7
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

231ac4cf73a42ea2dc3fb6fc6c708a1288322ce9c98098d3e6f1b100c2c0b3d7

Threat Level: Known bad

The file bff92dc80413fbf07cac532191df5832 was found to be: Known bad.

Malicious Activity Summary

oski infostealer

Oski

Suspicious use of SetThreadContext

Program crash

Suspicious use of WriteProcessMemory

Suspicious behavior: EnumeratesProcesses

Suspicious use of AdjustPrivilegeToken

MITRE ATT&CK Matrix

N/A

Analysis: static1

Detonation Overview

Reported

2024-03-11 05:34

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-03-11 05:34

Reported

2024-03-11 05:37

Platform

win7-20240220-en

Max time kernel

122s

Max time network

123s

Command Line

powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\bff92dc80413fbf07cac532191df5832.ps1

Signatures

Oski

infostealer oski

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 2500 set thread context of 2564 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

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 2500 wrote to memory of 2564 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
PID 2500 wrote to memory of 2564 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
PID 2500 wrote to memory of 2564 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
PID 2500 wrote to memory of 2564 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
PID 2500 wrote to memory of 2564 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
PID 2500 wrote to memory of 2564 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
PID 2500 wrote to memory of 2564 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
PID 2500 wrote to memory of 2564 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
PID 2500 wrote to memory of 2564 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
PID 2500 wrote to memory of 2564 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
PID 2500 wrote to memory of 2564 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
PID 2500 wrote to memory of 2564 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
PID 2500 wrote to memory of 2564 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
PID 2564 wrote to memory of 1960 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe C:\Windows\SysWOW64\WerFault.exe
PID 2564 wrote to memory of 1960 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe C:\Windows\SysWOW64\WerFault.exe
PID 2564 wrote to memory of 1960 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe C:\Windows\SysWOW64\WerFault.exe
PID 2564 wrote to memory of 1960 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe C:\Windows\SysWOW64\WerFault.exe

Processes

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

powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\bff92dc80413fbf07cac532191df5832.ps1

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

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

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 2564 -s 736

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
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/2500-4-0x000000001B5B0000-0x000000001B892000-memory.dmp

memory/2500-5-0x00000000026F0000-0x00000000026F8000-memory.dmp

memory/2500-6-0x000007FEF5620000-0x000007FEF5FBD000-memory.dmp

memory/2500-7-0x0000000002B10000-0x0000000002B90000-memory.dmp

memory/2500-8-0x000007FEF5620000-0x000007FEF5FBD000-memory.dmp

memory/2500-9-0x0000000002B10000-0x0000000002B90000-memory.dmp

memory/2500-10-0x0000000002B10000-0x0000000002B90000-memory.dmp

memory/2500-11-0x0000000002B10000-0x0000000002B90000-memory.dmp

memory/2500-12-0x00000000029F0000-0x00000000029F8000-memory.dmp

memory/2564-23-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

memory/2564-21-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2564-24-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2564-19-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2564-17-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2564-15-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2564-13-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2500-27-0x000007FEF5620000-0x000007FEF5FBD000-memory.dmp

memory/2564-26-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2564-28-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2564-29-0x0000000000400000-0x0000000000438000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-03-11 05:34

Reported

2024-03-11 05:37

Platform

win10v2004-20240226-en

Max time kernel

150s

Max time network

155s

Command Line

powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\bff92dc80413fbf07cac532191df5832.ps1

Signatures

Oski

infostealer oski

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 4744 set thread context of 636 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 4744 wrote to memory of 2272 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
PID 4744 wrote to memory of 2272 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
PID 4744 wrote to memory of 2272 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
PID 4744 wrote to memory of 636 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
PID 4744 wrote to memory of 636 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
PID 4744 wrote to memory of 636 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
PID 4744 wrote to memory of 636 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
PID 4744 wrote to memory of 636 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
PID 4744 wrote to memory of 636 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
PID 4744 wrote to memory of 636 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
PID 4744 wrote to memory of 636 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
PID 4744 wrote to memory of 636 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\bff92dc80413fbf07cac532191df5832.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"

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 184 -p 636 -ip 636

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 636 -s 1272

Network

Country Destination Domain Proto
US 8.8.8.8:53 79.121.231.20.in-addr.arpa udp
US 8.8.8.8:53 2.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 97.17.167.52.in-addr.arpa udp
US 8.8.8.8:53 194.178.17.96.in-addr.arpa udp
VN 103.99.1.60:80 tcp
US 8.8.8.8:53 g.bing.com udp
US 204.79.197.200:443 g.bing.com tcp
US 8.8.8.8:53 26.35.223.20.in-addr.arpa udp
US 8.8.8.8:53 58.55.71.13.in-addr.arpa udp
US 8.8.8.8:53 241.154.82.20.in-addr.arpa udp
VN 103.99.1.60:80 tcp
US 8.8.8.8:53 86.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 138.32.126.40.in-addr.arpa udp
US 8.8.8.8:53 41.110.16.96.in-addr.arpa udp
VN 103.99.1.60:80 tcp
US 8.8.8.8:53 56.126.166.20.in-addr.arpa udp
VN 103.99.1.60:80 tcp
US 8.8.8.8:53 104.241.123.92.in-addr.arpa udp
US 8.8.8.8:53 119.110.54.20.in-addr.arpa udp
VN 103.99.1.60:80 tcp
US 8.8.8.8:53 174.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 18.134.221.88.in-addr.arpa udp
US 8.8.8.8:53 88.156.103.20.in-addr.arpa udp
US 8.8.8.8:53 tse1.mm.bing.net udp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 8.8.8.8:53 0.205.248.87.in-addr.arpa udp
VN 103.99.1.60:80 tcp
VN 103.99.1.60:80 tcp
US 8.8.8.8:53 180.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 217.135.221.88.in-addr.arpa udp
US 8.8.8.8:53 176.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 43.229.111.52.in-addr.arpa udp
US 8.8.8.8:53 25.73.42.20.in-addr.arpa udp
GB 96.17.178.174:80 tcp

Files

memory/4744-5-0x00000214B8500000-0x00000214B8522000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_lrmy2j45.wpi.ps1

MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

memory/4744-10-0x00007FFE83EB0000-0x00007FFE84971000-memory.dmp

memory/4744-11-0x00000214B85B0000-0x00000214B85C0000-memory.dmp

memory/4744-12-0x00000214B85B0000-0x00000214B85C0000-memory.dmp

memory/4744-13-0x00000214A00A0000-0x00000214A00A8000-memory.dmp

memory/636-14-0x0000000000400000-0x0000000000438000-memory.dmp

memory/636-17-0x0000000000400000-0x0000000000438000-memory.dmp

memory/4744-18-0x00007FFE83EB0000-0x00007FFE84971000-memory.dmp

memory/636-19-0x0000000000400000-0x0000000000438000-memory.dmp

memory/636-20-0x0000000000400000-0x0000000000438000-memory.dmp

memory/636-21-0x0000000000400000-0x0000000000438000-memory.dmp

memory/636-24-0x0000000000400000-0x0000000000438000-memory.dmp