Malware Analysis Report

2024-10-18 21:03

Sample ID 231222-vejdzaafdr
Target f91a93aba78c83e1e03a3ce5e2dc72c6
SHA256 37cdb8d6a19c396cebbe44953363fcf9c7f7c27b1d27734edb81491dfb8c3069
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

37cdb8d6a19c396cebbe44953363fcf9c7f7c27b1d27734edb81491dfb8c3069

Threat Level: Known bad

The file f91a93aba78c83e1e03a3ce5e2dc72c6 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 16:54

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2023-12-22 16:54

Reported

2023-12-22 22:59

Platform

win7-20231129-en

Max time kernel

117s

Max time network

118s

Command Line

powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\f91a93aba78c83e1e03a3ce5e2dc72c6.ps1

Signatures

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\f91a93aba78c83e1e03a3ce5e2dc72c6.ps1

Network

N/A

Files

memory/1680-4-0x000000001B740000-0x000000001BA22000-memory.dmp

memory/1680-6-0x000007FEF5B90000-0x000007FEF652D000-memory.dmp

memory/1680-5-0x0000000001E80000-0x0000000001E88000-memory.dmp

memory/1680-7-0x0000000002CC0000-0x0000000002D40000-memory.dmp

memory/1680-9-0x0000000002CC0000-0x0000000002D40000-memory.dmp

memory/1680-8-0x000007FEF5B90000-0x000007FEF652D000-memory.dmp

memory/1680-10-0x0000000002CC0000-0x0000000002D40000-memory.dmp

memory/1680-11-0x0000000002CC0000-0x0000000002D40000-memory.dmp

memory/1680-12-0x000007FEF5B90000-0x000007FEF652D000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2023-12-22 16:54

Reported

2023-12-22 23:00

Platform

win10v2004-20231215-en

Max time kernel

148s

Max time network

157s

Command Line

powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\f91a93aba78c83e1e03a3ce5e2dc72c6.ps1

Signatures

Oski

infostealer oski

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 3804 set thread context of 4364 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 3804 wrote to memory of 4364 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 3804 wrote to memory of 4364 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 3804 wrote to memory of 4364 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 3804 wrote to memory of 4364 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 3804 wrote to memory of 4364 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 3804 wrote to memory of 4364 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 3804 wrote to memory of 4364 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 3804 wrote to memory of 4364 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 3804 wrote to memory of 4364 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\f91a93aba78c83e1e03a3ce5e2dc72c6.ps1

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

#cmd

Network

Country Destination Domain Proto
US 8.8.8.8:53 59.128.231.4.in-addr.arpa udp
US 8.8.8.8:53 173.178.17.96.in-addr.arpa udp
US 20.231.121.79:80 tcp
US 8.8.8.8:53 241.154.82.20.in-addr.arpa udp
VN 103.114.107.28:80 tcp
US 8.8.8.8:53 158.240.127.40.in-addr.arpa udp
US 8.8.8.8:53 41.110.16.96.in-addr.arpa udp
US 8.8.8.8:53 26.165.165.52.in-addr.arpa udp
US 8.8.8.8:53 15.164.165.52.in-addr.arpa udp
US 8.8.8.8:53 18.134.221.88.in-addr.arpa udp
VN 103.114.107.28:80 tcp
US 8.8.8.8:53 208.194.73.20.in-addr.arpa udp
US 8.8.8.8:53 146.78.124.51.in-addr.arpa udp
US 8.8.8.8:53 0.204.248.87.in-addr.arpa udp
VN 103.114.107.28:80 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
VN 103.114.107.28:80 tcp
US 8.8.8.8:53 21.236.111.52.in-addr.arpa udp
US 8.8.8.8:53 81.171.91.138.in-addr.arpa udp
VN 103.114.107.28:80 tcp
VN 103.114.107.28:80 tcp
US 8.8.8.8:53 13.173.189.20.in-addr.arpa udp
VN 103.114.107.28:80 tcp

Files

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_qfwmvr00.epl.ps1

MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

memory/3804-9-0x0000022F6A7A0000-0x0000022F6A7C2000-memory.dmp

memory/3804-10-0x00007FFCBDC40000-0x00007FFCBE701000-memory.dmp

memory/3804-12-0x0000022F6A7F0000-0x0000022F6A800000-memory.dmp

memory/3804-11-0x0000022F6A7F0000-0x0000022F6A800000-memory.dmp

memory/3804-13-0x0000022F6A7D0000-0x0000022F6A7F6000-memory.dmp

memory/3804-15-0x0000022F6A7D0000-0x0000022F6A7F0000-memory.dmp

memory/3804-14-0x0000022F6A7D0000-0x0000022F6A7F0000-memory.dmp

memory/3804-17-0x0000022F6A7D0000-0x0000022F6A7F0000-memory.dmp

memory/3804-19-0x0000022F6A7D0000-0x0000022F6A7F0000-memory.dmp

memory/3804-21-0x0000022F6A7D0000-0x0000022F6A7F0000-memory.dmp

memory/3804-23-0x0000022F6A7D0000-0x0000022F6A7F0000-memory.dmp

memory/3804-25-0x0000022F6A7D0000-0x0000022F6A7F0000-memory.dmp

memory/3804-27-0x0000022F6A7D0000-0x0000022F6A7F0000-memory.dmp

memory/3804-29-0x0000022F6A7D0000-0x0000022F6A7F0000-memory.dmp

memory/3804-31-0x0000022F6A7D0000-0x0000022F6A7F0000-memory.dmp

memory/3804-33-0x0000022F6A7D0000-0x0000022F6A7F0000-memory.dmp

memory/3804-35-0x0000022F6A7D0000-0x0000022F6A7F0000-memory.dmp

memory/3804-39-0x0000022F6A7D0000-0x0000022F6A7F0000-memory.dmp

memory/3804-41-0x0000022F6A7D0000-0x0000022F6A7F0000-memory.dmp

memory/3804-37-0x0000022F6A7D0000-0x0000022F6A7F0000-memory.dmp

memory/3804-43-0x0000022F6A7D0000-0x0000022F6A7F0000-memory.dmp

memory/3804-45-0x0000022F6A7D0000-0x0000022F6A7F0000-memory.dmp

memory/3804-53-0x0000022F6A7D0000-0x0000022F6A7F0000-memory.dmp

memory/3804-51-0x0000022F6A7D0000-0x0000022F6A7F0000-memory.dmp

memory/3804-49-0x0000022F6A7D0000-0x0000022F6A7F0000-memory.dmp

memory/3804-47-0x0000022F6A7D0000-0x0000022F6A7F0000-memory.dmp

memory/3804-54-0x0000022F6A790000-0x0000022F6A791000-memory.dmp

memory/4364-55-0x0000000000400000-0x0000000000438000-memory.dmp

memory/4364-58-0x0000000000400000-0x0000000000438000-memory.dmp

memory/3804-59-0x00007FFCBDC40000-0x00007FFCBE701000-memory.dmp

memory/4364-60-0x0000000000400000-0x0000000000438000-memory.dmp

memory/4364-61-0x0000000000400000-0x0000000000438000-memory.dmp

memory/4364-62-0x0000000000400000-0x0000000000438000-memory.dmp