Malware Analysis Report

2024-10-18 21:03

Sample ID 231221-zgd99adbbm
Target 0446466ac12756312798acc282f43f42
SHA256 bd9cbcbfd7a897facee368f30d798f2b6cf4bb4aaf1b3301de96e691a6a5ce18
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

bd9cbcbfd7a897facee368f30d798f2b6cf4bb4aaf1b3301de96e691a6a5ce18

Threat Level: Known bad

The file 0446466ac12756312798acc282f43f42 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 20:41

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2023-12-21 20:41

Reported

2023-12-21 20:59

Platform

win7-20231129-en

Max time kernel

119s

Max time network

120s

Command Line

powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\0446466ac12756312798acc282f43f42.ps1

Signatures

Oski

infostealer oski

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 2408 set thread context of 2092 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe

Program crash

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\WerFault.exe N/A

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 2408 wrote to memory of 2092 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2408 wrote to memory of 2092 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2408 wrote to memory of 2092 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2408 wrote to memory of 2092 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2408 wrote to memory of 2092 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2408 wrote to memory of 2092 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2408 wrote to memory of 2092 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2408 wrote to memory of 2092 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2408 wrote to memory of 2092 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2408 wrote to memory of 2092 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2092 wrote to memory of 2644 N/A C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe C:\Windows\SysWOW64\WerFault.exe
PID 2092 wrote to memory of 2644 N/A C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe C:\Windows\SysWOW64\WerFault.exe
PID 2092 wrote to memory of 2644 N/A C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe C:\Windows\SysWOW64\WerFault.exe
PID 2092 wrote to memory of 2644 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\0446466ac12756312798acc282f43f42.ps1

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 2092 -s 504

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

"{path}"

Network

N/A

Files

memory/2408-4-0x000000001B7B0000-0x000000001BA92000-memory.dmp

memory/2408-5-0x0000000001D80000-0x0000000001D88000-memory.dmp

memory/2408-7-0x0000000002E60000-0x0000000002EE0000-memory.dmp

memory/2408-6-0x000007FEF6080000-0x000007FEF6A1D000-memory.dmp

memory/2408-8-0x000007FEF6080000-0x000007FEF6A1D000-memory.dmp

memory/2408-9-0x0000000002E60000-0x0000000002EE0000-memory.dmp

memory/2408-10-0x0000000002E60000-0x0000000002EE0000-memory.dmp

memory/2408-11-0x0000000002E60000-0x0000000002EE0000-memory.dmp

memory/2408-12-0x00000000028E0000-0x00000000028EA000-memory.dmp

memory/2092-19-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2092-23-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

memory/2092-21-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2092-24-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2092-26-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2408-27-0x000007FEF6080000-0x000007FEF6A1D000-memory.dmp

memory/2092-28-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2092-17-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2092-15-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2092-13-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2092-30-0x0000000000400000-0x0000000000438000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2023-12-21 20:41

Reported

2023-12-21 21:00

Platform

win10v2004-20231215-en

Max time kernel

143s

Max time network

152s

Command Line

powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\0446466ac12756312798acc282f43f42.ps1

Signatures

Oski

infostealer oski

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 4532 set thread context of 2288 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\0446466ac12756312798acc282f43f42.ps1

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

"{path}"

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 356 -p 2288 -ip 2288

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 2288 -s 1120

Network

Country Destination Domain Proto
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 85.177.190.20.in-addr.arpa udp
US 8.8.8.8:53 177.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 11.2.37.23.in-addr.arpa udp
US 8.8.8.8:53 183.59.114.20.in-addr.arpa udp
US 8.8.8.8:53 www.microsoft.com udp
US 2.17.5.133:80 www.microsoft.com tcp
US 8.8.8.8:53 206.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 133.5.17.2.in-addr.arpa udp
US 8.8.8.8:53 217.135.221.88.in-addr.arpa udp
US 8.8.8.8:53 150.1.37.23.in-addr.arpa udp
US 8.8.8.8:53 81.171.91.138.in-addr.arpa udp
US 8.8.8.8:53 189.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 179.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 211.143.182.52.in-addr.arpa udp

Files

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_0xsbm2qn.epm.ps1

MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

memory/4532-9-0x0000015CFF560000-0x0000015CFF582000-memory.dmp

memory/4532-10-0x00007FFB6DD40000-0x00007FFB6E801000-memory.dmp

memory/4532-11-0x0000015C98690000-0x0000015C986A0000-memory.dmp

memory/4532-12-0x0000015C98690000-0x0000015C986A0000-memory.dmp

memory/4532-13-0x0000015C9A950000-0x0000015C9A95A000-memory.dmp

memory/2288-14-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2288-17-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2288-18-0x0000000000400000-0x0000000000438000-memory.dmp

memory/4532-19-0x00007FFB6DD40000-0x00007FFB6E801000-memory.dmp

memory/2288-20-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2288-23-0x0000000000400000-0x0000000000438000-memory.dmp