Malware Analysis Report

2024-09-22 21:45

Sample ID 240304-1ylakaff69
Target b33604969a34f8a6d4678e154e049fd3
SHA256 db7c19cc03486f9948a0d9bb304baea5017f937802c88bb8ad85c7493fb5aeeb
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

db7c19cc03486f9948a0d9bb304baea5017f937802c88bb8ad85c7493fb5aeeb

Threat Level: Known bad

The file b33604969a34f8a6d4678e154e049fd3 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

2024-03-04 22:03

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-03-04 22:03

Reported

2024-03-04 22:06

Platform

win7-20240221-en

Max time kernel

118s

Max time network

121s

Command Line

powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\b33604969a34f8a6d4678e154e049fd3.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\b33604969a34f8a6d4678e154e049fd3.ps1

Network

N/A

Files

memory/1856-4-0x000000001B100000-0x000000001B3E2000-memory.dmp

memory/1856-5-0x0000000002490000-0x0000000002498000-memory.dmp

memory/1856-6-0x000007FEF53A0000-0x000007FEF5D3D000-memory.dmp

memory/1856-7-0x00000000024B0000-0x0000000002530000-memory.dmp

memory/1856-8-0x000007FEF53A0000-0x000007FEF5D3D000-memory.dmp

memory/1856-9-0x00000000024B0000-0x0000000002530000-memory.dmp

memory/1856-10-0x00000000024B0000-0x0000000002530000-memory.dmp

memory/1856-11-0x00000000024B0000-0x0000000002530000-memory.dmp

memory/1856-12-0x00000000024B0000-0x0000000002530000-memory.dmp

memory/1856-13-0x000007FEF53A0000-0x000007FEF5D3D000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-03-04 22:03

Reported

2024-03-04 22:06

Platform

win10v2004-20240226-en

Max time kernel

147s

Max time network

155s

Command Line

powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\b33604969a34f8a6d4678e154e049fd3.ps1

Signatures

Oski

infostealer oski

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 2776 set thread context of 3420 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 2776 wrote to memory of 3420 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 2776 wrote to memory of 3420 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 2776 wrote to memory of 3420 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 2776 wrote to memory of 3420 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 2776 wrote to memory of 3420 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 2776 wrote to memory of 3420 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 2776 wrote to memory of 3420 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 2776 wrote to memory of 3420 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 2776 wrote to memory of 3420 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\b33604969a34f8a6d4678e154e049fd3.ps1

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

#cmd

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 364 -p 3420 -ip 3420

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 3420 -s 1108

Network

Country Destination Domain Proto
US 8.8.8.8:53 149.177.190.20.in-addr.arpa udp
US 8.8.8.8:53 209.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 9.228.82.20.in-addr.arpa udp
US 8.8.8.8:53 23.178.78.104.in-addr.arpa udp
US 8.8.8.8:53 57.169.31.20.in-addr.arpa udp
US 8.8.8.8:53 86.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 171.39.242.20.in-addr.arpa udp
US 8.8.8.8:53 0.205.248.87.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 204.79.197.200:443 tse1.mm.bing.net tcp
US 8.8.8.8:53 26.35.223.20.in-addr.arpa udp
US 8.8.8.8:53 182.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 43.229.111.52.in-addr.arpa udp
US 8.8.8.8:53 104.193.132.51.in-addr.arpa udp

Files

memory/2776-6-0x0000022BB79B0000-0x0000022BB79D2000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_kdgzf4kf.1re.ps1

MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

memory/2776-10-0x00007FFA6FFF0000-0x00007FFA70AB1000-memory.dmp

memory/2776-11-0x0000022BB7940000-0x0000022BB7950000-memory.dmp

memory/2776-12-0x0000022BB7940000-0x0000022BB7950000-memory.dmp

memory/2776-13-0x0000022BB7980000-0x0000022BB79A6000-memory.dmp

memory/2776-14-0x0000022BB7980000-0x0000022BB79A0000-memory.dmp

memory/2776-15-0x0000022BB7980000-0x0000022BB79A0000-memory.dmp

memory/2776-17-0x0000022BB7980000-0x0000022BB79A0000-memory.dmp

memory/2776-19-0x0000022BB7980000-0x0000022BB79A0000-memory.dmp

memory/2776-21-0x0000022BB7980000-0x0000022BB79A0000-memory.dmp

memory/2776-23-0x0000022BB7980000-0x0000022BB79A0000-memory.dmp

memory/2776-25-0x0000022BB7980000-0x0000022BB79A0000-memory.dmp

memory/2776-27-0x0000022BB7980000-0x0000022BB79A0000-memory.dmp

memory/2776-29-0x0000022BB7980000-0x0000022BB79A0000-memory.dmp

memory/2776-31-0x0000022BB7980000-0x0000022BB79A0000-memory.dmp

memory/2776-33-0x0000022BB7980000-0x0000022BB79A0000-memory.dmp

memory/2776-35-0x0000022BB7980000-0x0000022BB79A0000-memory.dmp

memory/2776-37-0x0000022BB7980000-0x0000022BB79A0000-memory.dmp

memory/2776-39-0x0000022BB7980000-0x0000022BB79A0000-memory.dmp

memory/2776-41-0x0000022BB7980000-0x0000022BB79A0000-memory.dmp

memory/2776-43-0x0000022BB7980000-0x0000022BB79A0000-memory.dmp

memory/2776-45-0x0000022BB7980000-0x0000022BB79A0000-memory.dmp

memory/2776-47-0x0000022BB7980000-0x0000022BB79A0000-memory.dmp

memory/2776-49-0x0000022BB7980000-0x0000022BB79A0000-memory.dmp

memory/2776-51-0x0000022BB7980000-0x0000022BB79A0000-memory.dmp

memory/2776-53-0x0000022BB7980000-0x0000022BB79A0000-memory.dmp

memory/2776-54-0x0000022BB79A0000-0x0000022BB79A1000-memory.dmp

memory/3420-55-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2776-59-0x00007FFA6FFF0000-0x00007FFA70AB1000-memory.dmp

memory/3420-58-0x0000000000400000-0x0000000000438000-memory.dmp

memory/3420-60-0x0000000000400000-0x0000000000438000-memory.dmp

memory/3420-61-0x0000000000400000-0x0000000000438000-memory.dmp

memory/3420-64-0x0000000000400000-0x0000000000438000-memory.dmp