Malware Analysis Report

2024-09-22 21:48

Sample ID 240113-k4w19afedp
Target 588973c3e0c9775ff44f3ec831624cad
SHA256 e543def5c2daeca7cf754090cffd2985dd00a3e03630391d5e0155121a557af6
Tags
oski infostealer
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK Matrix

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

e543def5c2daeca7cf754090cffd2985dd00a3e03630391d5e0155121a557af6

Threat Level: Known bad

The file 588973c3e0c9775ff44f3ec831624cad 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 Matrix

N/A

Analysis: static1

Detonation Overview

Reported

2024-01-13 09:09

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-01-13 09:09

Reported

2024-01-13 09:12

Platform

win7-20231215-en

Max time kernel

131s

Max time network

139s

Command Line

powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\588973c3e0c9775ff44f3ec831624cad.ps1

Signatures

Oski

infostealer oski

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 2532 set thread context of 2264 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.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 2532 wrote to memory of 2264 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 2532 wrote to memory of 2264 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 2532 wrote to memory of 2264 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 2532 wrote to memory of 2264 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 2532 wrote to memory of 2264 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 2532 wrote to memory of 2264 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 2532 wrote to memory of 2264 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 2532 wrote to memory of 2264 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 2532 wrote to memory of 2264 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 2532 wrote to memory of 2264 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe

Processes

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe

powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\588973c3e0c9775ff44f3ec831624cad.ps1

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

#Powershell

Network

Country Destination Domain Proto
VN 103.99.1.60:80 tcp
VN 103.99.1.60:80 tcp
VN 103.99.1.60:80 tcp
VN 103.99.1.60:80 tcp
VN 103.99.1.60:80 tcp
VN 103.99.1.60:80 tcp
VN 103.99.1.60:80 tcp

Files

memory/2532-4-0x000000001B5E0000-0x000000001B8C2000-memory.dmp

memory/2532-5-0x0000000001E60000-0x0000000001E68000-memory.dmp

memory/2532-6-0x000007FEF5A60000-0x000007FEF63FD000-memory.dmp

memory/2532-7-0x0000000002940000-0x00000000029C0000-memory.dmp

memory/2532-8-0x000007FEF5A60000-0x000007FEF63FD000-memory.dmp

memory/2532-9-0x0000000002940000-0x00000000029C0000-memory.dmp

memory/2532-10-0x0000000002940000-0x00000000029C0000-memory.dmp

memory/2532-11-0x00000000029F0000-0x0000000002A02000-memory.dmp

memory/2264-16-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2264-15-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2264-14-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2264-13-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2264-12-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2264-17-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

memory/2264-18-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2264-20-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2532-21-0x000007FEF5A60000-0x000007FEF63FD000-memory.dmp

memory/2264-22-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2264-23-0x0000000000400000-0x0000000000438000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-01-13 09:09

Reported

2024-01-13 09:12

Platform

win10v2004-20231215-en

Max time kernel

149s

Max time network

150s

Command Line

powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\588973c3e0c9775ff44f3ec831624cad.ps1

Signatures

Oski

infostealer oski

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 2176 set thread context of 4756 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.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

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2176 wrote to memory of 4756 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 2176 wrote to memory of 4756 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 2176 wrote to memory of 4756 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 2176 wrote to memory of 4756 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 2176 wrote to memory of 4756 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 2176 wrote to memory of 4756 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 2176 wrote to memory of 4756 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 2176 wrote to memory of 4756 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 2176 wrote to memory of 4756 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe

Processes

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe

powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\588973c3e0c9775ff44f3ec831624cad.ps1

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

#Powershell

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 432 -p 4756 -ip 4756

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 4756 -s 1216

Network

Country Destination Domain Proto
US 138.91.171.81:80 tcp
US 8.8.8.8:53 208.194.73.20.in-addr.arpa udp
VN 103.99.1.60:80 tcp
US 8.8.8.8:53 19.177.190.20.in-addr.arpa udp
US 8.8.8.8:53 240.221.184.93.in-addr.arpa udp
US 8.8.8.8:53 43.58.199.20.in-addr.arpa udp
US 8.8.8.8:53 158.240.127.40.in-addr.arpa udp
VN 103.99.1.60:80 tcp
US 8.8.8.8:53 50.23.12.20.in-addr.arpa udp
US 8.8.8.8:53 171.39.242.20.in-addr.arpa udp
VN 103.99.1.60:80 tcp
VN 103.99.1.60:80 tcp
VN 103.99.1.60:80 tcp
US 8.8.8.8:53 13.227.111.52.in-addr.arpa udp
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
VN 103.99.1.60:80 tcp
VN 103.99.1.60:80 tcp
US 8.8.8.8:53 178.223.142.52.in-addr.arpa udp
US 8.8.8.8:53 104.193.132.51.in-addr.arpa udp

Files

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_nwa5urzq.fae.ps1

MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

memory/2176-9-0x000001A8C8020000-0x000001A8C8042000-memory.dmp

memory/2176-10-0x00007FFE26660000-0x00007FFE27121000-memory.dmp

memory/2176-12-0x000001A8C80B0000-0x000001A8C80C0000-memory.dmp

memory/2176-11-0x000001A8C80B0000-0x000001A8C80C0000-memory.dmp

memory/2176-13-0x000001A8C8010000-0x000001A8C8022000-memory.dmp

memory/4756-20-0x0000000000400000-0x0000000000438000-memory.dmp

memory/4756-19-0x0000000000400000-0x0000000000438000-memory.dmp

memory/4756-17-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2176-18-0x00007FFE26660000-0x00007FFE27121000-memory.dmp

memory/4756-14-0x0000000000400000-0x0000000000438000-memory.dmp

memory/4756-21-0x0000000000400000-0x0000000000438000-memory.dmp

memory/4756-24-0x0000000000400000-0x0000000000438000-memory.dmp