Malware Analysis Report

2024-10-18 21:02

Sample ID 231222-rt3vdaaggm
Target c3e00cc05db28caecab4318f65f9a7c2
SHA256 3975ff5fd7f0c5e82b1f932ce5c5fd1d66627dac6043701fe26cbf36035f91bb
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

3975ff5fd7f0c5e82b1f932ce5c5fd1d66627dac6043701fe26cbf36035f91bb

Threat Level: Known bad

The file c3e00cc05db28caecab4318f65f9a7c2 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 14:29

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2023-12-22 14:29

Reported

2023-12-22 18:08

Platform

win7-20231129-en

Max time kernel

121s

Max time network

123s

Command Line

powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\c3e00cc05db28caecab4318f65f9a7c2.ps1

Signatures

Oski

infostealer oski

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 2360 set thread context of 2168 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 2360 wrote to memory of 2168 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2360 wrote to memory of 2168 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2360 wrote to memory of 2168 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2360 wrote to memory of 2168 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2360 wrote to memory of 2168 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2360 wrote to memory of 2168 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2360 wrote to memory of 2168 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2360 wrote to memory of 2168 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2360 wrote to memory of 2168 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2360 wrote to memory of 2168 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2168 wrote to memory of 2904 N/A C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe C:\Windows\SysWOW64\WerFault.exe
PID 2168 wrote to memory of 2904 N/A C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe C:\Windows\SysWOW64\WerFault.exe
PID 2168 wrote to memory of 2904 N/A C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe C:\Windows\SysWOW64\WerFault.exe
PID 2168 wrote to memory of 2904 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\c3e00cc05db28caecab4318f65f9a7c2.ps1

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

"{path}"

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 2168 -s 504

Network

N/A

Files

memory/2360-5-0x000007FEF5940000-0x000007FEF62DD000-memory.dmp

memory/2360-6-0x0000000002840000-0x00000000028C0000-memory.dmp

memory/2360-7-0x0000000002790000-0x0000000002798000-memory.dmp

memory/2360-8-0x000007FEF5940000-0x000007FEF62DD000-memory.dmp

memory/2360-9-0x0000000002840000-0x00000000028C0000-memory.dmp

memory/2360-10-0x0000000002840000-0x00000000028C0000-memory.dmp

memory/2360-11-0x0000000002840000-0x00000000028C0000-memory.dmp

memory/2360-4-0x000000001B5C0000-0x000000001B8A2000-memory.dmp

memory/2168-25-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2360-24-0x000007FEF5940000-0x000007FEF62DD000-memory.dmp

memory/2168-23-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2168-21-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2168-20-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

memory/2168-19-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2168-18-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2168-17-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2168-15-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2168-13-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2360-12-0x00000000029F0000-0x00000000029FA000-memory.dmp

memory/2168-27-0x0000000000400000-0x0000000000438000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2023-12-22 14:29

Reported

2023-12-22 18:08

Platform

win10v2004-20231215-en

Max time kernel

143s

Max time network

169s

Command Line

powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\c3e00cc05db28caecab4318f65f9a7c2.ps1

Signatures

Oski

infostealer oski

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 4576 set thread context of 2600 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\c3e00cc05db28caecab4318f65f9a7c2.ps1

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

"{path}"

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 416 -p 2600 -ip 2600

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 2600 -s 1100

Network

Country Destination Domain Proto
US 138.91.171.81:80 tcp
US 8.8.8.8:53 194.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 64.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 241.154.82.20.in-addr.arpa udp
US 8.8.8.8:53 41.110.16.96.in-addr.arpa udp
US 8.8.8.8:53 157.123.68.40.in-addr.arpa udp
US 8.8.8.8:53 198.187.3.20.in-addr.arpa udp
US 8.8.8.8:53 58.99.105.20.in-addr.arpa udp
US 8.8.8.8:53 9.228.82.20.in-addr.arpa udp
US 8.8.8.8:53 217.135.221.88.in-addr.arpa udp
US 8.8.8.8:53 81.171.91.138.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
US 8.8.8.8:53 200.197.79.204.in-addr.arpa udp
US 8.8.8.8:53 13.227.111.52.in-addr.arpa udp
US 8.8.8.8:53 178.223.142.52.in-addr.arpa udp
US 8.8.8.8:53 11.179.89.13.in-addr.arpa udp

Files

memory/4576-0-0x000001E8FDD30000-0x000001E8FDD52000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_kfzp55r2.3xk.ps1

MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

memory/4576-10-0x000001E8FDD90000-0x000001E8FDD9A000-memory.dmp

memory/2600-11-0x0000000000400000-0x0000000000438000-memory.dmp

memory/4576-12-0x00007FFC9EBD0000-0x00007FFC9F691000-memory.dmp

memory/2600-15-0x0000000000400000-0x0000000000438000-memory.dmp

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

memory/2600-17-0x0000000000400000-0x0000000000438000-memory.dmp

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

memory/4576-21-0x00007FFC9EBD0000-0x00007FFC9F691000-memory.dmp