Malware Analysis Report

2024-10-18 21:03

Sample ID 231222-ejzzhsdhh4
Target 5f34c76b6ffb8fd032ccc5633072f573
SHA256 dbe7ae3664d55a4ed1720658ddbcdd00210649becb4a5a48ed13e08b98d94010
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

dbe7ae3664d55a4ed1720658ddbcdd00210649becb4a5a48ed13e08b98d94010

Threat Level: Known bad

The file 5f34c76b6ffb8fd032ccc5633072f573 was found to be: Known bad.

Malicious Activity Summary

oski infostealer

Oski

Suspicious use of SetThreadContext

Suspicious behavior: EnumeratesProcesses

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

MITRE ATT&CK

N/A

Analysis: static1

Detonation Overview

Reported

2023-12-22 03:58

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2023-12-22 03:58

Reported

2023-12-23 07:35

Platform

win7-20231215-en

Max time kernel

0s

Max time network

137s

Command Line

powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\5f34c76b6ffb8fd032ccc5633072f573.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

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\5f34c76b6ffb8fd032ccc5633072f573.ps1

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

"{path}"

Network

Country Destination Domain Proto
VN 103.114.107.28:80 tcp
VN 103.114.107.28:80 tcp
VN 103.114.107.28:80 tcp
VN 103.114.107.28:80 tcp
VN 103.114.107.28:80 tcp
VN 103.114.107.28:80 tcp
VN 103.114.107.28:80 tcp

Files

memory/860-4-0x000000001B790000-0x000000001BA72000-memory.dmp

memory/860-6-0x000007FEF4850000-0x000007FEF51ED000-memory.dmp

memory/860-7-0x0000000002E10000-0x0000000002E90000-memory.dmp

memory/860-11-0x0000000002E10000-0x0000000002E90000-memory.dmp

memory/860-10-0x0000000002E10000-0x0000000002E90000-memory.dmp

memory/860-9-0x0000000002E10000-0x0000000002E90000-memory.dmp

memory/860-8-0x000007FEF4850000-0x000007FEF51ED000-memory.dmp

memory/860-5-0x0000000001E80000-0x0000000001E88000-memory.dmp

memory/2292-19-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2292-24-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2292-25-0x0000000000400000-0x0000000000438000-memory.dmp

memory/860-23-0x000007FEF4850000-0x000007FEF51ED000-memory.dmp

memory/2292-21-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2292-20-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

memory/2292-18-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2292-17-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2292-15-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2292-13-0x0000000000400000-0x0000000000438000-memory.dmp

memory/860-12-0x0000000002960000-0x000000000296A000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2023-12-22 03:58

Reported

2023-12-23 07:35

Platform

win10v2004-20231215-en

Max time kernel

158s

Max time network

165s

Command Line

powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\5f34c76b6ffb8fd032ccc5633072f573.ps1

Signatures

Oski

infostealer oski

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 336 set thread context of 3476 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe

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 336 wrote to memory of 3792 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 336 wrote to memory of 3792 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 336 wrote to memory of 3792 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 336 wrote to memory of 3476 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 336 wrote to memory of 3476 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 336 wrote to memory of 3476 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 336 wrote to memory of 3476 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 336 wrote to memory of 3476 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 336 wrote to memory of 3476 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 336 wrote to memory of 3476 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 336 wrote to memory of 3476 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 336 wrote to memory of 3476 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe

Processes

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

powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\5f34c76b6ffb8fd032ccc5633072f573.ps1

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

"{path}"

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

"{path}"

Network

Country Destination Domain Proto
US 138.91.171.81:80 tcp
US 8.8.8.8:53 79.121.231.20.in-addr.arpa udp
US 8.8.8.8:53 1.181.190.20.in-addr.arpa udp
US 8.8.8.8:53 208.194.73.20.in-addr.arpa udp
US 8.8.8.8:53 194.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 9.228.82.20.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
VN 103.114.107.28:80 tcp
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 88.156.103.20.in-addr.arpa udp
US 8.8.8.8:53 41.110.16.96.in-addr.arpa udp
US 8.8.8.8:53 59.128.231.4.in-addr.arpa udp
US 8.8.8.8:53 158.240.127.40.in-addr.arpa udp
US 8.8.8.8:53 103.169.127.40.in-addr.arpa udp
US 8.8.8.8:53 206.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 240.221.184.93.in-addr.arpa udp
VN 103.114.107.28:80 tcp
US 8.8.8.8:53 tse1.mm.bing.net udp
US 8.8.8.8:53 55.36.223.20.in-addr.arpa 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
VN 103.114.107.28:80 tcp
VN 103.114.107.28:80 tcp
VN 103.114.107.28:80 tcp
US 8.8.8.8:53 178.223.142.52.in-addr.arpa udp
VN 103.114.107.28:80 tcp
US 8.8.8.8:53 136.71.105.51.in-addr.arpa udp
VN 103.114.107.28:80 tcp

Files

memory/336-0-0x000001FA3D4A0000-0x000001FA3D4C2000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_eh4mq4a4.3md.ps1

MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

memory/336-10-0x00007FFED44E0000-0x00007FFED4FA1000-memory.dmp

memory/336-11-0x000001FA3D4E0000-0x000001FA3D4F0000-memory.dmp

memory/336-13-0x000001FA3D4E0000-0x000001FA3D4F0000-memory.dmp

memory/336-12-0x000001FA3D4E0000-0x000001FA3D4F0000-memory.dmp

memory/336-14-0x000001FA3D4D0000-0x000001FA3D4DA000-memory.dmp

memory/3476-18-0x0000000000400000-0x0000000000438000-memory.dmp

memory/336-19-0x00007FFED44E0000-0x00007FFED4FA1000-memory.dmp

memory/3476-15-0x0000000000400000-0x0000000000438000-memory.dmp

memory/3476-20-0x0000000000400000-0x0000000000438000-memory.dmp

memory/3476-21-0x0000000000400000-0x0000000000438000-memory.dmp

memory/3476-22-0x0000000000400000-0x0000000000438000-memory.dmp