Malware Analysis Report

2024-10-18 21:02

Sample ID 231222-c6w52aagh7
Target 54d62e92b93a40149d7e4fa19b798201
SHA256 1384fedda1a2064b73982c64c756d109b16979a61ced905b338e7ad044c5e2f1
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

1384fedda1a2064b73982c64c756d109b16979a61ced905b338e7ad044c5e2f1

Threat Level: Known bad

The file 54d62e92b93a40149d7e4fa19b798201 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 02:41

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2023-12-22 02:41

Reported

2023-12-23 06:03

Platform

win7-20231215-en

Max time kernel

119s

Max time network

124s

Command Line

powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\54d62e92b93a40149d7e4fa19b798201.ps1

Signatures

Oski

infostealer oski

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 1452 set thread context of 2812 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 1452 wrote to memory of 2812 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 1452 wrote to memory of 2812 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 1452 wrote to memory of 2812 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 1452 wrote to memory of 2812 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 1452 wrote to memory of 2812 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 1452 wrote to memory of 2812 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 1452 wrote to memory of 2812 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 1452 wrote to memory of 2812 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 1452 wrote to memory of 2812 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 1452 wrote to memory of 2812 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2812 wrote to memory of 2604 N/A C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe C:\Windows\SysWOW64\WerFault.exe
PID 2812 wrote to memory of 2604 N/A C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe C:\Windows\SysWOW64\WerFault.exe
PID 2812 wrote to memory of 2604 N/A C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe C:\Windows\SysWOW64\WerFault.exe
PID 2812 wrote to memory of 2604 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\54d62e92b93a40149d7e4fa19b798201.ps1

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

"{path}"

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 2812 -s 504

Network

N/A

Files

memory/1452-5-0x000007FEF5630000-0x000007FEF5FCD000-memory.dmp

memory/1452-4-0x000000001B330000-0x000000001B612000-memory.dmp

memory/1452-7-0x0000000002390000-0x0000000002398000-memory.dmp

memory/1452-6-0x0000000002900000-0x0000000002980000-memory.dmp

memory/1452-8-0x000007FEF5630000-0x000007FEF5FCD000-memory.dmp

memory/1452-10-0x0000000002900000-0x0000000002980000-memory.dmp

memory/1452-9-0x0000000002900000-0x0000000002980000-memory.dmp

memory/1452-11-0x0000000002900000-0x0000000002980000-memory.dmp

memory/1452-12-0x00000000027C0000-0x00000000027CA000-memory.dmp

memory/2812-13-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2812-15-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2812-17-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2812-19-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2812-21-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2812-23-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

memory/2812-24-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2812-26-0x0000000000400000-0x0000000000438000-memory.dmp

memory/1452-27-0x000007FEF5630000-0x000007FEF5FCD000-memory.dmp

memory/2812-28-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2812-30-0x0000000000400000-0x0000000000438000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2023-12-22 02:41

Reported

2023-12-23 06:03

Platform

win10v2004-20231222-en

Max time kernel

132s

Max time network

137s

Command Line

powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\54d62e92b93a40149d7e4fa19b798201.ps1

Signatures

Oski

infostealer oski

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 968 set thread context of 212 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\54d62e92b93a40149d7e4fa19b798201.ps1

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

"{path}"

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 424 -p 212 -ip 212

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 212 -s 1104

Network

Country Destination Domain Proto
US 8.8.8.8:53 g.bing.com udp
US 204.79.197.200:443 g.bing.com tcp
US 8.8.8.8:53 200.197.79.204.in-addr.arpa udp
US 8.8.8.8:53 82.177.190.20.in-addr.arpa udp
US 8.8.8.8:53 41.110.16.96.in-addr.arpa udp
US 8.8.8.8:53 26.35.223.20.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 9.228.82.20.in-addr.arpa udp
US 8.8.8.8:53 180.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 29.243.111.52.in-addr.arpa udp

Files

memory/968-0-0x000002B91B0D0000-0x000002B91B0F2000-memory.dmp

memory/968-10-0x00007FFC3A700000-0x00007FFC3B1C1000-memory.dmp

memory/968-11-0x000002B91AEA0000-0x000002B91AEB0000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_ipym0fj3.kne.ps1

MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

memory/212-13-0x0000000000400000-0x0000000000438000-memory.dmp

memory/212-15-0x0000000000400000-0x0000000000438000-memory.dmp

memory/968-17-0x00007FFC3A700000-0x00007FFC3B1C1000-memory.dmp

memory/212-18-0x0000000000400000-0x0000000000438000-memory.dmp

memory/212-16-0x0000000000400000-0x0000000000438000-memory.dmp

memory/968-12-0x000002B91AFA0000-0x000002B91AFAA000-memory.dmp

memory/212-21-0x0000000000400000-0x0000000000438000-memory.dmp