Malware Analysis Report

2024-10-18 21:03

Sample ID 231221-1mzc2sgfgl
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 21:46

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2023-12-21 21:46

Reported

2023-12-21 22:19

Platform

win7-20231129-en

Max time kernel

118s

Max time network

119s

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 2224 set thread context of 2144 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 2224 wrote to memory of 2144 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2224 wrote to memory of 2144 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2224 wrote to memory of 2144 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2224 wrote to memory of 2144 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2224 wrote to memory of 2144 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2224 wrote to memory of 2144 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2224 wrote to memory of 2144 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2224 wrote to memory of 2144 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2224 wrote to memory of 2144 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2224 wrote to memory of 2144 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2144 wrote to memory of 2668 N/A C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe C:\Windows\SysWOW64\WerFault.exe
PID 2144 wrote to memory of 2668 N/A C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe C:\Windows\SysWOW64\WerFault.exe
PID 2144 wrote to memory of 2668 N/A C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe C:\Windows\SysWOW64\WerFault.exe
PID 2144 wrote to memory of 2668 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\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe

"{path}"

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 2144 -s 500

Network

N/A

Files

memory/2224-4-0x000000001B6B0000-0x000000001B992000-memory.dmp

memory/2224-6-0x000007FEF5730000-0x000007FEF60CD000-memory.dmp

memory/2224-7-0x0000000002B00000-0x0000000002B80000-memory.dmp

memory/2224-5-0x00000000022D0000-0x00000000022D8000-memory.dmp

memory/2224-8-0x000007FEF5730000-0x000007FEF60CD000-memory.dmp

memory/2224-9-0x0000000002B00000-0x0000000002B80000-memory.dmp

memory/2224-10-0x0000000002B00000-0x0000000002B80000-memory.dmp

memory/2224-11-0x0000000002B00000-0x0000000002B80000-memory.dmp

memory/2224-12-0x000000001B550000-0x000000001B55A000-memory.dmp

memory/2144-19-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2144-18-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

memory/2144-17-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2144-16-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2144-15-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2144-14-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2144-13-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2144-21-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2144-23-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2224-22-0x000007FEF5730000-0x000007FEF60CD000-memory.dmp

memory/2144-25-0x0000000000400000-0x0000000000438000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2023-12-21 21:46

Reported

2023-12-21 22:19

Platform

win10v2004-20231215-en

Max time kernel

91s

Max time network

122s

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 2984 set thread context of 388 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 408 -p 388 -ip 388

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 388 -s 1100

Network

Country Destination Domain Proto
US 8.8.8.8:53 5.181.190.20.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 180.178.17.96.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 8.8.8.8:53 167.109.18.2.in-addr.arpa udp
US 8.8.8.8:53 50.23.12.20.in-addr.arpa udp
US 8.8.8.8:53 18.31.95.13.in-addr.arpa udp
US 8.8.8.8:53 194.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 19.229.111.52.in-addr.arpa udp

Files

memory/2984-9-0x000002A5F2DC0000-0x000002A5F2DE2000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_u4ljpr13.w0z.ps1

MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

memory/2984-10-0x00007FF9749F0000-0x00007FF9754B1000-memory.dmp

memory/2984-12-0x000002A5F2400000-0x000002A5F2410000-memory.dmp

memory/2984-11-0x000002A5F2400000-0x000002A5F2410000-memory.dmp

memory/2984-13-0x000002A5F23E0000-0x000002A5F23EA000-memory.dmp

memory/388-17-0x0000000000400000-0x0000000000438000-memory.dmp

memory/388-14-0x0000000000400000-0x0000000000438000-memory.dmp

memory/388-19-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2984-18-0x00007FF9749F0000-0x00007FF9754B1000-memory.dmp

memory/388-20-0x0000000000400000-0x0000000000438000-memory.dmp

memory/388-23-0x0000000000400000-0x0000000000438000-memory.dmp