Malware Analysis Report

2024-09-22 21:53

Sample ID 240317-bdm6zsah9s
Target cf8783d1c9bd6b15618c6de26308703b
SHA256 7a1cb678e79d27382387cd8df1b5f6f36c7d4b45b0151f608b125d226f6f16dc
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

7a1cb678e79d27382387cd8df1b5f6f36c7d4b45b0151f608b125d226f6f16dc

Threat Level: Known bad

The file cf8783d1c9bd6b15618c6de26308703b was found to be: Known bad.

Malicious Activity Summary

oski infostealer

Oski

Suspicious use of SetThreadContext

Program crash

Suspicious use of WriteProcessMemory

Suspicious behavior: EnumeratesProcesses

Suspicious use of AdjustPrivilegeToken

MITRE ATT&CK Matrix

N/A

Analysis: static1

Detonation Overview

Reported

2024-03-17 01:01

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-03-17 01:01

Reported

2024-03-17 01:04

Platform

win7-20240221-en

Max time kernel

120s

Max time network

124s

Command Line

powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\cf8783d1c9bd6b15618c6de26308703b.ps1

Signatures

Oski

infostealer oski

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 2152 set thread context of 2628 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 2152 wrote to memory of 2628 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2152 wrote to memory of 2628 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2152 wrote to memory of 2628 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2152 wrote to memory of 2628 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2152 wrote to memory of 2628 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2152 wrote to memory of 2628 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2152 wrote to memory of 2628 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2152 wrote to memory of 2628 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2152 wrote to memory of 2628 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2152 wrote to memory of 2628 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2628 wrote to memory of 1664 N/A C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe C:\Windows\SysWOW64\WerFault.exe
PID 2628 wrote to memory of 1664 N/A C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe C:\Windows\SysWOW64\WerFault.exe
PID 2628 wrote to memory of 1664 N/A C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe C:\Windows\SysWOW64\WerFault.exe
PID 2628 wrote to memory of 1664 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\cf8783d1c9bd6b15618c6de26308703b.ps1

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

"{path}"

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 2628 -s 500

Network

N/A

Files

memory/2152-5-0x000007FEF55A0000-0x000007FEF5F3D000-memory.dmp

memory/2152-4-0x000000001B420000-0x000000001B702000-memory.dmp

memory/2152-7-0x0000000001ED0000-0x0000000001ED8000-memory.dmp

memory/2152-6-0x0000000002300000-0x0000000002380000-memory.dmp

memory/2152-8-0x000007FEF55A0000-0x000007FEF5F3D000-memory.dmp

memory/2152-9-0x0000000002300000-0x0000000002380000-memory.dmp

memory/2152-10-0x0000000002300000-0x0000000002380000-memory.dmp

memory/2152-11-0x0000000002300000-0x0000000002380000-memory.dmp

memory/2152-12-0x0000000002630000-0x000000000263A000-memory.dmp

memory/2628-22-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

memory/2628-23-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2628-21-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2628-19-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2628-17-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2628-15-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2628-13-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2628-25-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2152-26-0x000007FEF55A0000-0x000007FEF5F3D000-memory.dmp

memory/2628-27-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2628-29-0x0000000000400000-0x0000000000438000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-03-17 01:01

Reported

2024-03-17 01:04

Platform

win10v2004-20240226-en

Max time kernel

149s

Max time network

151s

Command Line

powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\cf8783d1c9bd6b15618c6de26308703b.ps1

Signatures

Oski

infostealer oski

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 4208 set thread context of 5044 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\cf8783d1c9bd6b15618c6de26308703b.ps1

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

"{path}"

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 5044 -ip 5044

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 5044 -s 1100

Network

Country Destination Domain Proto
US 8.8.8.8:53 73.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 232.168.11.51.in-addr.arpa udp
US 8.8.8.8:53 240.221.184.93.in-addr.arpa udp
US 8.8.8.8:53 241.154.82.20.in-addr.arpa udp
US 8.8.8.8:53 55.36.223.20.in-addr.arpa udp
US 20.231.121.79:80 tcp
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 67.31.126.40.in-addr.arpa udp
US 8.8.8.8:53 149.220.183.52.in-addr.arpa udp
US 8.8.8.8:53 26.35.223.20.in-addr.arpa udp
US 8.8.8.8:53 48.229.111.52.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
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 8.8.8.8:53 10.173.189.20.in-addr.arpa udp

Files

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_zvqpzxwn.hg4.ps1

MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

memory/4208-5-0x000002B7DD570000-0x000002B7DD592000-memory.dmp

memory/4208-10-0x00007FFDAD880000-0x00007FFDAE341000-memory.dmp

memory/4208-11-0x000002B7DD540000-0x000002B7DD550000-memory.dmp

memory/4208-12-0x000002B7DD4F0000-0x000002B7DD4FA000-memory.dmp

memory/5044-13-0x0000000000400000-0x0000000000438000-memory.dmp

memory/5044-16-0x0000000000400000-0x0000000000438000-memory.dmp

memory/4208-17-0x00007FFDAD880000-0x00007FFDAE341000-memory.dmp

memory/5044-18-0x0000000000400000-0x0000000000438000-memory.dmp

memory/5044-19-0x0000000000400000-0x0000000000438000-memory.dmp

memory/5044-22-0x0000000000400000-0x0000000000438000-memory.dmp