Malware Analysis Report

2024-10-18 21:03

Sample ID 231222-fhq6naghh7
Target 691bcebe74dfe8204bb6eb1ca4f37f6b
SHA256 572c0ed2674a63ce3e58d42a019cdaca9cce57398636a07432da48f4920421c7
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

572c0ed2674a63ce3e58d42a019cdaca9cce57398636a07432da48f4920421c7

Threat Level: Known bad

The file 691bcebe74dfe8204bb6eb1ca4f37f6b 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

2023-12-22 04:52

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2023-12-22 04:52

Reported

2023-12-23 09:16

Platform

win7-20231129-en

Max time kernel

120s

Max time network

121s

Command Line

powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\691bcebe74dfe8204bb6eb1ca4f37f6b.ps1

Signatures

Oski

infostealer oski

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 2220 set thread context of 2600 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 2220 wrote to memory of 2600 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2220 wrote to memory of 2600 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2220 wrote to memory of 2600 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2220 wrote to memory of 2600 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2220 wrote to memory of 2600 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2220 wrote to memory of 2600 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2220 wrote to memory of 2600 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2220 wrote to memory of 2600 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2220 wrote to memory of 2600 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2220 wrote to memory of 2600 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2600 wrote to memory of 2772 N/A C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe C:\Windows\SysWOW64\WerFault.exe
PID 2600 wrote to memory of 2772 N/A C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe C:\Windows\SysWOW64\WerFault.exe
PID 2600 wrote to memory of 2772 N/A C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe C:\Windows\SysWOW64\WerFault.exe
PID 2600 wrote to memory of 2772 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\691bcebe74dfe8204bb6eb1ca4f37f6b.ps1

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 2600 -s 504

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

"{path}"

Network

N/A

Files

memory/2220-5-0x0000000001EB0000-0x0000000001EB8000-memory.dmp

memory/2220-4-0x000000001B750000-0x000000001BA32000-memory.dmp

memory/2220-7-0x0000000002AB0000-0x0000000002B30000-memory.dmp

memory/2220-6-0x000007FEF52A0000-0x000007FEF5C3D000-memory.dmp

memory/2220-8-0x000007FEF52A0000-0x000007FEF5C3D000-memory.dmp

memory/2220-9-0x0000000002AB0000-0x0000000002B30000-memory.dmp

memory/2220-10-0x0000000002AB0000-0x0000000002B30000-memory.dmp

memory/2600-23-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2220-26-0x000007FEF52A0000-0x000007FEF5C3D000-memory.dmp

memory/2600-25-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2600-27-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2600-22-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

memory/2600-20-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2600-18-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2600-16-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2600-14-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2600-12-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2220-11-0x00000000020C0000-0x00000000020CA000-memory.dmp

memory/2600-29-0x0000000000400000-0x0000000000438000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2023-12-22 04:52

Reported

2023-12-23 09:16

Platform

win10v2004-20231222-en

Max time kernel

145s

Max time network

147s

Command Line

powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\691bcebe74dfe8204bb6eb1ca4f37f6b.ps1

Signatures

Oski

infostealer oski

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 4812 set thread context of 32 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\691bcebe74dfe8204bb6eb1ca4f37f6b.ps1

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

"{path}"

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 432 -p 32 -ip 32

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 32 -s 1104

Network

Country Destination Domain Proto
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 149.177.190.20.in-addr.arpa udp
US 8.8.8.8:53 41.110.16.96.in-addr.arpa udp
US 8.8.8.8:53 55.36.223.20.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 241.154.82.20.in-addr.arpa udp
US 8.8.8.8:53 0.204.248.87.in-addr.arpa udp
US 8.8.8.8:53 204.201.50.20.in-addr.arpa udp

Files

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_joc5rxxm.pva.ps1

MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

memory/4812-5-0x0000027D63490000-0x0000027D634B2000-memory.dmp

memory/4812-10-0x00007FF86CBF0000-0x00007FF86D6B1000-memory.dmp

memory/4812-11-0x0000027D63530000-0x0000027D63540000-memory.dmp

memory/4812-12-0x0000027D63530000-0x0000027D63540000-memory.dmp

memory/4812-13-0x0000027D63480000-0x0000027D6348A000-memory.dmp

memory/32-14-0x0000000000400000-0x0000000000438000-memory.dmp

memory/32-16-0x0000000000400000-0x0000000000438000-memory.dmp

memory/4812-18-0x00007FF86CBF0000-0x00007FF86D6B1000-memory.dmp

memory/32-17-0x0000000000400000-0x0000000000438000-memory.dmp

memory/32-19-0x0000000000400000-0x0000000000438000-memory.dmp

memory/32-22-0x0000000000400000-0x0000000000438000-memory.dmp