Malware Analysis Report

2024-09-22 21:47

Sample ID 240110-b5ezpacff2
Target 4c8015bbc773e46fdbd2ed3785d7bb57.bin
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.bin 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 Matrix

N/A

Analysis: static1

Detonation Overview

Reported

2024-01-10 01:43

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-01-10 01:43

Reported

2024-01-10 01:47

Platform

win7-20231215-en

Max time kernel

193s

Max time network

233s

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 2564 set thread context of 1744 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 2564 wrote to memory of 1744 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 2564 wrote to memory of 1744 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 2564 wrote to memory of 1744 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 2564 wrote to memory of 1744 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 2564 wrote to memory of 1744 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 2564 wrote to memory of 1744 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 2564 wrote to memory of 1744 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 2564 wrote to memory of 1744 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 2564 wrote to memory of 1744 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 2564 wrote to memory of 1744 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
VN 103.99.1.60:80 tcp
VN 103.99.1.60:80 tcp
VN 103.99.1.60:80 tcp
VN 103.99.1.60:80 tcp
VN 103.99.1.60:80 tcp

Files

memory/2564-4-0x000000001B250000-0x000000001B532000-memory.dmp

memory/2564-5-0x000007FEF5490000-0x000007FEF5E2D000-memory.dmp

memory/2564-6-0x0000000002860000-0x00000000028E0000-memory.dmp

memory/2564-7-0x0000000002860000-0x00000000028E0000-memory.dmp

memory/2564-8-0x0000000002860000-0x00000000028E0000-memory.dmp

memory/2564-9-0x000007FEF5490000-0x000007FEF5E2D000-memory.dmp

memory/2564-10-0x0000000001EE0000-0x0000000001EE8000-memory.dmp

memory/2564-11-0x0000000002860000-0x00000000028E0000-memory.dmp

memory/2564-13-0x0000000002780000-0x0000000002792000-memory.dmp

memory/2564-14-0x000007FEF5490000-0x000007FEF5E2D000-memory.dmp

memory/2564-15-0x0000000002860000-0x00000000028E0000-memory.dmp

memory/2564-16-0x0000000002860000-0x00000000028E0000-memory.dmp

memory/2564-17-0x0000000002860000-0x00000000028E0000-memory.dmp

memory/2564-18-0x000007FEF5490000-0x000007FEF5E2D000-memory.dmp

memory/1744-23-0x0000000000400000-0x0000000000438000-memory.dmp

memory/1744-25-0x0000000000400000-0x0000000000438000-memory.dmp

memory/1744-27-0x0000000000400000-0x0000000000438000-memory.dmp

memory/1744-21-0x0000000000400000-0x0000000000438000-memory.dmp

memory/1744-19-0x0000000000400000-0x0000000000438000-memory.dmp

memory/1744-29-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

memory/1744-30-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2564-33-0x000007FEF5490000-0x000007FEF5E2D000-memory.dmp

memory/1744-32-0x0000000000400000-0x0000000000438000-memory.dmp

memory/1744-34-0x0000000000400000-0x0000000000438000-memory.dmp

memory/1744-35-0x0000000000400000-0x0000000000438000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-01-10 01:43

Reported

2024-01-10 01:46

Platform

win10v2004-20231215-en

Max time kernel

149s

Max time network

149s

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 4084 set thread context of 4540 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe

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 4084 wrote to memory of 4920 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 4084 wrote to memory of 4920 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 4084 wrote to memory of 4920 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 4084 wrote to memory of 4540 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 4084 wrote to memory of 4540 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 4084 wrote to memory of 4540 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 4084 wrote to memory of 4540 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 4084 wrote to memory of 4540 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 4084 wrote to memory of 4540 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 4084 wrote to memory of 4540 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 4084 wrote to memory of 4540 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 4084 wrote to memory of 4540 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

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

#Powershell

Network

Country Destination Domain Proto
US 8.8.8.8:53 0.181.190.20.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
VN 103.99.1.60:80 tcp
US 8.8.8.8:53 9.228.82.20.in-addr.arpa udp
US 8.8.8.8:53 41.110.16.96.in-addr.arpa udp
US 8.8.8.8:53 59.128.231.4.in-addr.arpa udp
VN 103.99.1.60:80 tcp
US 8.8.8.8:53 157.123.68.40.in-addr.arpa udp
US 8.8.8.8:53 15.164.165.52.in-addr.arpa udp
US 8.8.8.8:53 137.71.91.104.in-addr.arpa udp
US 8.8.8.8:53 146.78.124.51.in-addr.arpa udp
VN 103.99.1.60:80 tcp
VN 103.99.1.60:80 tcp
VN 103.99.1.60:80 tcp
US 8.8.8.8:53 48.229.111.52.in-addr.arpa udp
US 8.8.8.8:53 81.171.91.138.in-addr.arpa udp
US 8.8.8.8:53 88.156.103.20.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
VN 103.99.1.60:80 tcp
VN 103.99.1.60:80 tcp

Files

memory/4084-5-0x00000299DBF90000-0x00000299DBFB2000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_mqucpgri.1vz.ps1

MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

memory/4084-10-0x00007FFEC3D10000-0x00007FFEC47D1000-memory.dmp

memory/4084-11-0x00000299F4530000-0x00000299F4540000-memory.dmp

memory/4084-12-0x00000299F4530000-0x00000299F4540000-memory.dmp

memory/4084-13-0x00000299F44B0000-0x00000299F44C2000-memory.dmp

memory/4540-15-0x0000000000400000-0x0000000000438000-memory.dmp

memory/4084-19-0x00007FFEC3D10000-0x00007FFEC47D1000-memory.dmp

memory/4540-20-0x0000000000400000-0x0000000000438000-memory.dmp

memory/4540-18-0x0000000000400000-0x0000000000438000-memory.dmp

memory/4540-14-0x0000000000400000-0x0000000000438000-memory.dmp

memory/4540-21-0x0000000000400000-0x0000000000438000-memory.dmp