Malware Analysis Report

2024-09-22 21:45

Sample ID 240305-drkdcsdh66
Target b3a18b4fa0d0ea832e9807e265669977
SHA256 ad3b313a244216f2b1351bae0e8c7e62292c4fe657670a6a604619673236508f
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

ad3b313a244216f2b1351bae0e8c7e62292c4fe657670a6a604619673236508f

Threat Level: Known bad

The file b3a18b4fa0d0ea832e9807e265669977 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

2024-03-05 03:14

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-03-05 03:14

Reported

2024-03-05 03:17

Platform

win7-20240221-en

Max time kernel

119s

Max time network

120s

Command Line

powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\b3a18b4fa0d0ea832e9807e265669977.ps1

Signatures

Oski

infostealer oski

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 2864 set thread context of 2736 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 2864 wrote to memory of 2736 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2864 wrote to memory of 2736 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2864 wrote to memory of 2736 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2864 wrote to memory of 2736 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2864 wrote to memory of 2736 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2864 wrote to memory of 2736 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2864 wrote to memory of 2736 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2864 wrote to memory of 2736 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2864 wrote to memory of 2736 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2864 wrote to memory of 2736 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
PID 2736 wrote to memory of 848 N/A C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe C:\Windows\SysWOW64\WerFault.exe
PID 2736 wrote to memory of 848 N/A C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe C:\Windows\SysWOW64\WerFault.exe
PID 2736 wrote to memory of 848 N/A C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe C:\Windows\SysWOW64\WerFault.exe
PID 2736 wrote to memory of 848 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\b3a18b4fa0d0ea832e9807e265669977.ps1

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

"{path}"

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 2736 -s 500

Network

N/A

Files

memory/2864-4-0x000000001B5F0000-0x000000001B8D2000-memory.dmp

memory/2864-6-0x0000000002340000-0x0000000002348000-memory.dmp

memory/2864-5-0x000007FEF5C10000-0x000007FEF65AD000-memory.dmp

memory/2864-7-0x0000000002970000-0x00000000029F0000-memory.dmp

memory/2864-9-0x0000000002970000-0x00000000029F0000-memory.dmp

memory/2864-8-0x000007FEF5C10000-0x000007FEF65AD000-memory.dmp

memory/2864-10-0x0000000002970000-0x00000000029F0000-memory.dmp

memory/2864-11-0x0000000002A90000-0x0000000002A9A000-memory.dmp

memory/2736-17-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

memory/2736-18-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2736-16-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2736-15-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2736-14-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2736-13-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2864-20-0x000007FEF5C10000-0x000007FEF65AD000-memory.dmp

memory/2736-12-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2736-21-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2736-22-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2736-24-0x0000000000400000-0x0000000000438000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-03-05 03:14

Reported

2024-03-05 03:17

Platform

win10v2004-20240226-en

Max time kernel

148s

Max time network

151s

Command Line

powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\b3a18b4fa0d0ea832e9807e265669977.ps1

Signatures

Oski

infostealer oski

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 3588 set thread context of 4720 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\b3a18b4fa0d0ea832e9807e265669977.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 4720 -ip 4720

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 4720 -s 1104

Network

Country Destination Domain Proto
US 8.8.8.8:53 97.17.167.52.in-addr.arpa udp
US 8.8.8.8:53 180.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 23.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 9.228.82.20.in-addr.arpa udp
US 8.8.8.8:53 26.35.223.20.in-addr.arpa udp
US 8.8.8.8:53 58.55.71.13.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 8.8.8.8:53 198.187.3.20.in-addr.arpa udp
US 8.8.8.8:53 13.86.106.20.in-addr.arpa udp
US 8.8.8.8:53 104.241.123.92.in-addr.arpa udp
US 8.8.8.8:53 119.110.54.20.in-addr.arpa udp
US 8.8.8.8:53 217.135.221.88.in-addr.arpa udp
US 8.8.8.8:53 240.221.184.93.in-addr.arpa udp
NL 52.142.223.178:80 tcp
US 8.8.8.8:53 32.134.221.88.in-addr.arpa udp
US 8.8.8.8:53 209.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 205.47.74.20.in-addr.arpa udp
US 8.8.8.8:53 31.243.111.52.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 55.36.223.20.in-addr.arpa udp
US 8.8.8.8:53 200.197.79.204.in-addr.arpa udp
US 8.8.8.8:53 18.134.221.88.in-addr.arpa udp

Files

memory/3588-5-0x0000023771E80000-0x0000023771EA2000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_cktyt043.ami.ps1

MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

memory/3588-10-0x00007FFD292A0000-0x00007FFD29D61000-memory.dmp

memory/3588-11-0x0000023771ED0000-0x0000023771EE0000-memory.dmp

memory/3588-12-0x0000023771EB0000-0x0000023771EBA000-memory.dmp

memory/4720-13-0x0000000000400000-0x0000000000438000-memory.dmp

memory/4720-16-0x0000000000400000-0x0000000000438000-memory.dmp

memory/4720-18-0x0000000000400000-0x0000000000438000-memory.dmp

memory/3588-17-0x00007FFD292A0000-0x00007FFD29D61000-memory.dmp

memory/4720-19-0x0000000000400000-0x0000000000438000-memory.dmp

memory/4720-22-0x0000000000400000-0x0000000000438000-memory.dmp