Malware Analysis Report

2024-10-18 21:03

Sample ID 231221-1pcl3ahbdk
Target 05df1a35f25ff857db2e24c1dcb65777
SHA256 10dee76aaab7ab2441547cd74e8a282fb349e3e023c73f958d212db7ad09b313
Tags
oski infostealer
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

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

10dee76aaab7ab2441547cd74e8a282fb349e3e023c73f958d212db7ad09b313

Threat Level: Known bad

The file 05df1a35f25ff857db2e24c1dcb65777 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

N/A

Analysis: static1

Detonation Overview

Reported

2023-12-21 21:49

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2023-12-21 21:49

Reported

2023-12-21 22:28

Platform

win7-20231215-en

Max time kernel

122s

Max time network

126s

Command Line

powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\05df1a35f25ff857db2e24c1dcb65777.ps1

Signatures

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 1068 wrote to memory of 1756 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 1068 wrote to memory of 1756 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 1068 wrote to memory of 1756 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 1068 wrote to memory of 1756 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 1068 wrote to memory of 1612 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 1068 wrote to memory of 1612 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 1068 wrote to memory of 1612 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 1068 wrote to memory of 1612 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 1068 wrote to memory of 2060 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 1068 wrote to memory of 2060 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 1068 wrote to memory of 2060 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 1068 wrote to memory of 2060 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 1068 wrote to memory of 2608 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 1068 wrote to memory of 2608 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 1068 wrote to memory of 2608 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 1068 wrote to memory of 2608 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 1068 wrote to memory of 2656 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 1068 wrote to memory of 2656 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 1068 wrote to memory of 2656 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 1068 wrote to memory of 2656 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe

Processes

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

powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\05df1a35f25ff857db2e24c1dcb65777.ps1

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

#cmd

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

#cmd

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

#cmd

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

#cmd

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

#cmd

Network

N/A

Files

memory/1068-4-0x000000001B260000-0x000000001B542000-memory.dmp

memory/1068-5-0x00000000026E0000-0x00000000026E8000-memory.dmp

memory/1068-6-0x000007FEF5FE0000-0x000007FEF697D000-memory.dmp

memory/1068-7-0x0000000002930000-0x00000000029B0000-memory.dmp

memory/1068-8-0x0000000002930000-0x00000000029B0000-memory.dmp

memory/1068-9-0x000007FEF5FE0000-0x000007FEF697D000-memory.dmp

memory/1068-10-0x0000000002930000-0x00000000029B0000-memory.dmp

memory/1068-11-0x0000000002860000-0x0000000002872000-memory.dmp

memory/1068-12-0x000007FEF5FE0000-0x000007FEF697D000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2023-12-21 21:49

Reported

2023-12-21 22:28

Platform

win10v2004-20231215-en

Max time kernel

93s

Max time network

129s

Command Line

powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\05df1a35f25ff857db2e24c1dcb65777.ps1

Signatures

Oski

infostealer oski

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 4604 set thread context of 2792 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\05df1a35f25ff857db2e24c1dcb65777.ps1

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

#cmd

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 2792 -ip 2792

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 2792 -s 1100

Network

Country Destination Domain Proto
US 8.8.8.8:53 148.177.190.20.in-addr.arpa udp
US 8.8.8.8:53 9.228.82.20.in-addr.arpa udp
US 8.8.8.8:53 240.221.184.93.in-addr.arpa udp
US 8.8.8.8:53 26.35.223.20.in-addr.arpa udp
US 8.8.8.8:53 41.110.16.96.in-addr.arpa udp
US 8.8.8.8:53 183.59.114.20.in-addr.arpa udp
US 8.8.8.8:53 15.164.165.52.in-addr.arpa udp
US 8.8.8.8:53 18.134.221.88.in-addr.arpa udp
US 8.8.8.8:53 30.243.111.52.in-addr.arpa udp
US 8.8.8.8:53 0.204.248.87.in-addr.arpa udp

Files

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_qrj3zqgd.rae.ps1

MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

memory/4604-5-0x000001FF7C940000-0x000001FF7C962000-memory.dmp

memory/4604-11-0x000001FF7C9A0000-0x000001FF7C9B0000-memory.dmp

memory/4604-12-0x000001FF7C9A0000-0x000001FF7C9B0000-memory.dmp

memory/4604-10-0x00007FFECC6E0000-0x00007FFECD1A1000-memory.dmp

memory/4604-13-0x000001FF64450000-0x000001FF64462000-memory.dmp

memory/2792-14-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2792-17-0x0000000000400000-0x0000000000438000-memory.dmp

memory/4604-18-0x00007FFECC6E0000-0x00007FFECD1A1000-memory.dmp

memory/2792-19-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2792-20-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2792-23-0x0000000000400000-0x0000000000438000-memory.dmp