Malware Analysis Report

2024-09-22 21:47

Sample ID 240111-kc6flsdcb2
Target 530792b4cfa0029b904ae5130fe1d265
SHA256 341efe957c47c866377854003f2bc59907ea2cebb98728121cc68f3b94e2c835
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

341efe957c47c866377854003f2bc59907ea2cebb98728121cc68f3b94e2c835

Threat Level: Known bad

The file 530792b4cfa0029b904ae5130fe1d265 was found to be: Known bad.

Malicious Activity Summary

oski infostealer

Oski

Suspicious use of SetThreadContext

Program crash

Suspicious behavior: EnumeratesProcesses

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

MITRE ATT&CK Matrix

N/A

Analysis: static1

Detonation Overview

Reported

2024-01-11 08:28

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-01-11 08:28

Reported

2024-01-11 08:30

Platform

win7-20231215-en

Max time kernel

119s

Max time network

122s

Command Line

powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\530792b4cfa0029b904ae5130fe1d265.ps1

Signatures

Oski

infostealer oski

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 1352 set thread context of 2808 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.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 1352 wrote to memory of 2808 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 1352 wrote to memory of 2808 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 1352 wrote to memory of 2808 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 1352 wrote to memory of 2808 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 1352 wrote to memory of 2808 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 1352 wrote to memory of 2808 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 1352 wrote to memory of 2808 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 1352 wrote to memory of 2808 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 1352 wrote to memory of 2808 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 1352 wrote to memory of 2808 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2808 wrote to memory of 2736 N/A C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe C:\Windows\SysWOW64\WerFault.exe
PID 2808 wrote to memory of 2736 N/A C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe C:\Windows\SysWOW64\WerFault.exe
PID 2808 wrote to memory of 2736 N/A C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe C:\Windows\SysWOW64\WerFault.exe
PID 2808 wrote to memory of 2736 N/A C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.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\530792b4cfa0029b904ae5130fe1d265.ps1

C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe

"{path}"

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 2808 -s 112

Network

N/A

Files

memory/1352-4-0x000000001B100000-0x000000001B3E2000-memory.dmp

memory/1352-5-0x000007FEF5440000-0x000007FEF5DDD000-memory.dmp

memory/1352-7-0x00000000029B0000-0x0000000002A30000-memory.dmp

memory/1352-8-0x00000000029B0000-0x0000000002A30000-memory.dmp

memory/1352-9-0x00000000029B0000-0x0000000002A30000-memory.dmp

memory/1352-6-0x0000000002460000-0x0000000002468000-memory.dmp

memory/1352-10-0x000007FEF5440000-0x000007FEF5DDD000-memory.dmp

memory/1352-11-0x00000000029B0000-0x0000000002A30000-memory.dmp

memory/1352-12-0x00000000029A0000-0x00000000029AA000-memory.dmp

memory/2808-19-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

memory/2808-20-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2808-18-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2808-16-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2808-15-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2808-14-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2808-13-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2808-22-0x0000000000400000-0x0000000000438000-memory.dmp

memory/1352-23-0x000007FEF5440000-0x000007FEF5DDD000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-01-11 08:28

Reported

2024-01-11 08:31

Platform

win10v2004-20231215-en

Max time kernel

150s

Max time network

150s

Command Line

powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\530792b4cfa0029b904ae5130fe1d265.ps1

Signatures

Oski

infostealer oski

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 4936 set thread context of 1816 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.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\530792b4cfa0029b904ae5130fe1d265.ps1

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

"{path}"

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 416 -p 1816 -ip 1816

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 1816 -s 1244

Network

Country Destination Domain Proto
US 8.8.8.8:53 21.53.126.40.in-addr.arpa udp
VN 103.114.107.28:80 tcp
US 8.8.8.8:53 208.194.73.20.in-addr.arpa udp
US 8.8.8.8:53 175.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 241.154.82.20.in-addr.arpa udp
US 8.8.8.8:53 88.156.103.20.in-addr.arpa udp
US 8.8.8.8:53 41.110.16.96.in-addr.arpa udp
US 8.8.8.8:53 9.228.82.20.in-addr.arpa udp
VN 103.114.107.28:80 tcp
US 8.8.8.8:53 157.123.68.40.in-addr.arpa udp
US 8.8.8.8:53 198.187.3.20.in-addr.arpa udp
US 8.8.8.8:53 18.134.221.88.in-addr.arpa udp
US 8.8.8.8:53 205.47.74.20.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
VN 103.114.107.28:80 tcp
US 8.8.8.8:53 194.178.17.96.in-addr.arpa udp
VN 103.114.107.28:80 tcp
US 8.8.8.8:53 11.227.111.52.in-addr.arpa udp
VN 103.114.107.28:80 tcp
VN 103.114.107.28:80 tcp
VN 103.114.107.28:80 tcp
US 8.8.8.8:53 15.173.189.20.in-addr.arpa udp

Files

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_xj1k0doy.ywi.ps1

MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

memory/4936-9-0x000002A17E4C0000-0x000002A17E4E2000-memory.dmp

memory/4936-10-0x00007FFA31440000-0x00007FFA31F01000-memory.dmp

memory/4936-11-0x000002A17DC10000-0x000002A17DC20000-memory.dmp

memory/4936-12-0x000002A17E4B0000-0x000002A17E4BA000-memory.dmp

memory/1816-13-0x0000000000400000-0x0000000000438000-memory.dmp

memory/1816-16-0x0000000000400000-0x0000000000438000-memory.dmp

memory/4936-18-0x00007FFA31440000-0x00007FFA31F01000-memory.dmp

memory/1816-19-0x0000000000400000-0x0000000000438000-memory.dmp

memory/1816-17-0x0000000000400000-0x0000000000438000-memory.dmp

memory/1816-20-0x0000000000400000-0x0000000000438000-memory.dmp