Malware Analysis Report

2024-09-22 21:46

Sample ID 240108-1cdnlacbel
Target 4c8015bbc773e46fdbd2ed3785d7bb57
SHA256 9bb9ebda548a1b5411f95a24e4f2b27705473e91033ae6cb158c19eb2cca5908
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

9bb9ebda548a1b5411f95a24e4f2b27705473e91033ae6cb158c19eb2cca5908

Threat Level: Known bad

The file 4c8015bbc773e46fdbd2ed3785d7bb57 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

2024-01-08 21:29

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-01-08 21:29

Reported

2024-01-08 21:32

Platform

win7-20231215-en

Max time kernel

121s

Max time network

124s

Command Line

powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\4c8015bbc773e46fdbd2ed3785d7bb57.ps1

Signatures

Oski

infostealer oski

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 2528 set thread context of 2852 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

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 2528 wrote to memory of 2852 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 2528 wrote to memory of 2852 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 2528 wrote to memory of 2852 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 2528 wrote to memory of 2852 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 2528 wrote to memory of 2852 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 2528 wrote to memory of 2852 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 2528 wrote to memory of 2852 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 2528 wrote to memory of 2852 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 2528 wrote to memory of 2852 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 2528 wrote to memory of 2852 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 2852 wrote to memory of 1420 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe C:\Windows\SysWOW64\WerFault.exe
PID 2852 wrote to memory of 1420 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe C:\Windows\SysWOW64\WerFault.exe
PID 2852 wrote to memory of 1420 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe C:\Windows\SysWOW64\WerFault.exe
PID 2852 wrote to memory of 1420 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.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\4c8015bbc773e46fdbd2ed3785d7bb57.ps1

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

#Powershell

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 2852 -s 112

Network

N/A

Files

memory/2528-4-0x000000001B230000-0x000000001B512000-memory.dmp

memory/2528-5-0x0000000002460000-0x0000000002468000-memory.dmp

memory/2528-7-0x0000000002870000-0x00000000028F0000-memory.dmp

memory/2528-6-0x000007FEF5800000-0x000007FEF619D000-memory.dmp

memory/2528-8-0x000007FEF5800000-0x000007FEF619D000-memory.dmp

memory/2528-10-0x0000000002870000-0x00000000028F0000-memory.dmp

memory/2528-9-0x0000000002870000-0x00000000028F0000-memory.dmp

memory/2528-11-0x000000001B190000-0x000000001B1A2000-memory.dmp

memory/2852-19-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2852-17-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2852-15-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2852-14-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2852-12-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2852-21-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2852-20-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

memory/2528-23-0x000007FEF5800000-0x000007FEF619D000-memory.dmp

memory/2852-24-0x0000000000400000-0x0000000000438000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-01-08 21:29

Reported

2024-01-08 21:32

Platform

win10v2004-20231215-en

Max time kernel

9s

Max time network

127s

Command Line

powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\4c8015bbc773e46fdbd2ed3785d7bb57.ps1

Signatures

Oski

infostealer oski

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 1468 set thread context of 3316 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 1468 wrote to memory of 3316 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 1468 wrote to memory of 3316 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 1468 wrote to memory of 3316 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 1468 wrote to memory of 3316 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 1468 wrote to memory of 3316 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 1468 wrote to memory of 3316 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 1468 wrote to memory of 3316 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 1468 wrote to memory of 3316 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 1468 wrote to memory of 3316 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\4c8015bbc773e46fdbd2ed3785d7bb57.ps1

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

#Powershell

Network

Country Destination Domain Proto
US 20.231.121.79:80 tcp
US 8.8.8.8:53 20.177.190.20.in-addr.arpa udp
US 8.8.8.8:53 146.78.124.51.in-addr.arpa udp
US 8.8.8.8:53 178.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 241.154.82.20.in-addr.arpa udp
US 8.8.8.8:53 208.194.73.20.in-addr.arpa udp
VN 103.99.1.60:80 tcp
US 8.8.8.8:53 167.109.18.2.in-addr.arpa udp
US 8.8.8.8:53 9.228.82.20.in-addr.arpa udp
US 8.8.8.8:53 157.123.68.40.in-addr.arpa udp
US 8.8.8.8:53 59.128.231.4.in-addr.arpa udp
US 8.8.8.8:53 18.31.95.13.in-addr.arpa udp
VN 103.99.1.60:80 tcp
US 8.8.8.8:53 134.71.91.104.in-addr.arpa udp
US 8.8.8.8:53 183.1.37.23.in-addr.arpa udp
US 8.8.8.8:53 119.110.54.20.in-addr.arpa udp
US 8.8.8.8:53 140.71.91.104.in-addr.arpa udp
US 8.8.8.8:53 174.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 207.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 61.179.17.96.in-addr.arpa udp
US 204.79.197.200:443 tcp
US 8.8.8.8:53 11.192.122.92.in-addr.arpa udp
GB 87.248.205.0:80 tcp
GB 87.248.205.0:80 tcp
VN 103.99.1.60:80 tcp
GB 87.248.205.0:80 tcp
US 8.8.8.8:53 48.229.111.52.in-addr.arpa udp
GB 87.248.205.0:80 tcp
VN 103.99.1.60:80 tcp
US 8.8.8.8:53 udp

Files

memory/1468-5-0x0000013678F10000-0x0000013678F32000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_2pca2tfc.dgu.ps1

MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

memory/1468-12-0x000001365E7F0000-0x000001365E800000-memory.dmp

memory/1468-13-0x000001365E7F0000-0x000001365E800000-memory.dmp

memory/1468-11-0x000001365E7F0000-0x000001365E800000-memory.dmp

memory/1468-10-0x00007FFBE9770000-0x00007FFBEA231000-memory.dmp

memory/1468-14-0x0000013679080000-0x0000013679092000-memory.dmp

memory/3316-18-0x0000000000400000-0x0000000000438000-memory.dmp

memory/1468-20-0x00007FFBE9770000-0x00007FFBEA231000-memory.dmp

memory/3316-21-0x0000000000400000-0x0000000000438000-memory.dmp

memory/3316-19-0x0000000000400000-0x0000000000438000-memory.dmp

memory/3316-15-0x0000000000400000-0x0000000000438000-memory.dmp

memory/3316-22-0x0000000000400000-0x0000000000438000-memory.dmp