Malware Analysis Report

2024-10-18 21:02

Sample ID 231222-efymaadgc3
Target 5e955058a451a655fe87853ab9195363
SHA256 f491801e1e4a8b38f28d939e337436a8650f5d849060854df452eb1b56053b17
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

f491801e1e4a8b38f28d939e337436a8650f5d849060854df452eb1b56053b17

Threat Level: Known bad

The file 5e955058a451a655fe87853ab9195363 was found to be: Known bad.

Malicious Activity Summary

oski infostealer

Oski

Suspicious use of SetThreadContext

Program crash

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

Suspicious behavior: EnumeratesProcesses

MITRE ATT&CK

N/A

Analysis: static1

Detonation Overview

Reported

2023-12-22 03:53

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2023-12-22 03:53

Reported

2023-12-23 07:31

Platform

win7-20231215-en

Max time kernel

122s

Max time network

136s

Command Line

powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\5e955058a451a655fe87853ab9195363.ps1

Signatures

Oski

infostealer oski

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 2284 set thread context of 2748 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 2284 wrote to memory of 2748 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2284 wrote to memory of 2748 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2284 wrote to memory of 2748 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2284 wrote to memory of 2748 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2284 wrote to memory of 2748 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2284 wrote to memory of 2748 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2284 wrote to memory of 2748 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2284 wrote to memory of 2748 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2284 wrote to memory of 2748 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2284 wrote to memory of 2748 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2748 wrote to memory of 2616 N/A C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe C:\Windows\SysWOW64\WerFault.exe
PID 2748 wrote to memory of 2616 N/A C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe C:\Windows\SysWOW64\WerFault.exe
PID 2748 wrote to memory of 2616 N/A C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe C:\Windows\SysWOW64\WerFault.exe
PID 2748 wrote to memory of 2616 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\5e955058a451a655fe87853ab9195363.ps1

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 2748 -s 496

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

"{path}"

Network

N/A

Files

memory/2284-4-0x000000001B240000-0x000000001B522000-memory.dmp

memory/2284-5-0x00000000024E0000-0x00000000024E8000-memory.dmp

memory/2284-6-0x000007FEF5D60000-0x000007FEF66FD000-memory.dmp

memory/2284-7-0x0000000002820000-0x00000000028A0000-memory.dmp

memory/2284-8-0x000007FEF5D60000-0x000007FEF66FD000-memory.dmp

memory/2284-9-0x0000000002820000-0x00000000028A0000-memory.dmp

memory/2284-10-0x0000000002820000-0x00000000028A0000-memory.dmp

memory/2284-11-0x0000000002800000-0x000000000280A000-memory.dmp

memory/2748-12-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2748-18-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2748-17-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

memory/2748-16-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2284-21-0x000007FEF5D60000-0x000007FEF66FD000-memory.dmp

memory/2748-20-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2748-22-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2748-15-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2748-14-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2748-13-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2748-24-0x0000000000400000-0x0000000000438000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2023-12-22 03:53

Reported

2023-12-23 07:30

Platform

win10v2004-20231215-en

Max time kernel

0s

Max time network

107s

Command Line

powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\5e955058a451a655fe87853ab9195363.ps1

Signatures

Oski

infostealer oski

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\5e955058a451a655fe87853ab9195363.ps1

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

"{path}"

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 208 -p 432 -ip 432

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 432 -s 1112

Network

Country Destination Domain Proto
US 8.8.8.8:53 g.bing.com udp
US 8.8.8.8:53 19.177.190.20.in-addr.arpa udp
US 8.8.8.8:53 2.136.104.51.in-addr.arpa udp
US 8.8.8.8:53 0.204.248.87.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 43.58.199.20.in-addr.arpa 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 41.110.16.96.in-addr.arpa udp
US 8.8.8.8:53 59.128.231.4.in-addr.arpa udp
US 8.8.8.8:53 50.23.12.20.in-addr.arpa udp
US 8.8.8.8:53 56.126.166.20.in-addr.arpa udp
US 8.8.8.8:53 217.135.221.88.in-addr.arpa udp
IE 20.223.35.26:443 tcp
IE 20.223.35.26:443 tcp
IE 20.223.35.26:443 tcp
US 8.8.8.8:53 tse1.mm.bing.net udp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp

Files

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_do3nwod5.4sj.ps1

MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

memory/4464-12-0x000002359DD70000-0x000002359DD80000-memory.dmp

memory/4464-11-0x000002359DD70000-0x000002359DD80000-memory.dmp

memory/4464-10-0x00007FFCB5020000-0x00007FFCB5AE1000-memory.dmp

memory/4464-0-0x00000235B8470000-0x00000235B8492000-memory.dmp

memory/432-20-0x0000000000400000-0x0000000000438000-memory.dmp

memory/432-19-0x0000000000400000-0x0000000000438000-memory.dmp

memory/4464-18-0x00007FFCB5020000-0x00007FFCB5AE1000-memory.dmp

memory/432-17-0x0000000000400000-0x0000000000438000-memory.dmp

memory/432-14-0x0000000000400000-0x0000000000438000-memory.dmp

memory/4464-13-0x00000235B8460000-0x00000235B846A000-memory.dmp

memory/432-23-0x0000000000400000-0x0000000000438000-memory.dmp