Malware Analysis Report

2024-09-22 21:48

Sample ID 240115-s7dcbaafaq
Target 5d7989ec481168e731c3cfb7c5ab847b
SHA256 87b44496287299afa907dcd2cfd440d030cd727590a6f5b97e712e9d6229fa2c
Tags
oski infostealer
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK Matrix

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

87b44496287299afa907dcd2cfd440d030cd727590a6f5b97e712e9d6229fa2c

Threat Level: Known bad

The file 5d7989ec481168e731c3cfb7c5ab847b was found to be: Known bad.

Malicious Activity Summary

oski infostealer

Oski

Suspicious use of SetThreadContext

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

Suspicious behavior: EnumeratesProcesses

MITRE ATT&CK Matrix

N/A

Analysis: static1

Detonation Overview

Reported

2024-01-15 15:45

Signatures

N/A

Analysis: behavioral2

Detonation Overview

Submitted

2024-01-15 15:45

Reported

2024-01-15 15:48

Platform

win10v2004-20231215-en

Max time kernel

140s

Max time network

159s

Command Line

powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\5d7989ec481168e731c3cfb7c5ab847b.ps1

Signatures

Oski

infostealer oski

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 536 set thread context of 3208 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 536 wrote to memory of 3208 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 536 wrote to memory of 3208 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 536 wrote to memory of 3208 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 536 wrote to memory of 3208 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 536 wrote to memory of 3208 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 536 wrote to memory of 3208 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 536 wrote to memory of 3208 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 536 wrote to memory of 3208 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
PID 536 wrote to memory of 3208 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\5d7989ec481168e731c3cfb7c5ab847b.ps1

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

#cmd

Network

Country Destination Domain Proto
VN 103.99.1.60:80 tcp
US 8.8.8.8:53 2.136.104.51.in-addr.arpa udp
US 8.8.8.8:53 19.177.190.20.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 59.128.231.4.in-addr.arpa udp
US 8.8.8.8:53 157.123.68.40.in-addr.arpa udp
US 8.8.8.8:53 171.39.242.20.in-addr.arpa udp
US 8.8.8.8:53 217.135.221.88.in-addr.arpa udp
VN 103.99.1.60:80 tcp
US 8.8.8.8:53 57.110.18.2.in-addr.arpa udp
US 8.8.8.8:53 178.223.142.52.in-addr.arpa udp
VN 103.99.1.60:80 tcp
VN 103.99.1.60:80 tcp
US 8.8.8.8:53 29.243.111.52.in-addr.arpa udp
VN 103.99.1.60:80 tcp
VN 103.99.1.60:80 tcp
US 8.8.8.8:53 26.73.42.20.in-addr.arpa udp
VN 103.99.1.60:80 tcp

Files

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_to3n3zzu.bxx.ps1

MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

memory/536-9-0x000002CC07C80000-0x000002CC07CA2000-memory.dmp

memory/536-10-0x00007FFBE7690000-0x00007FFBE8151000-memory.dmp

memory/536-11-0x000002CC07BC0000-0x000002CC07BD0000-memory.dmp

memory/536-12-0x000002CC07BC0000-0x000002CC07BD0000-memory.dmp

memory/536-13-0x000002CC07BC0000-0x000002CC07BD0000-memory.dmp

memory/536-14-0x000002CC22440000-0x000002CC22456000-memory.dmp

memory/3208-15-0x0000000000400000-0x0000000000438000-memory.dmp

memory/536-18-0x00007FFBE7690000-0x00007FFBE8151000-memory.dmp

memory/3208-19-0x0000000000400000-0x0000000000438000-memory.dmp

memory/3208-20-0x0000000000400000-0x0000000000438000-memory.dmp

memory/3208-21-0x0000000000400000-0x0000000000438000-memory.dmp

memory/3208-22-0x0000000000400000-0x0000000000438000-memory.dmp

Analysis: behavioral1

Detonation Overview

Submitted

2024-01-15 15:45

Reported

2024-01-15 15:48

Platform

win7-20231215-en

Max time kernel

120s

Max time network

125s

Command Line

powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\5d7989ec481168e731c3cfb7c5ab847b.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\5d7989ec481168e731c3cfb7c5ab847b.ps1

Network

N/A

Files

memory/1748-4-0x000000001B250000-0x000000001B532000-memory.dmp

memory/1748-5-0x0000000002430000-0x0000000002438000-memory.dmp

memory/1748-6-0x000007FEF5A80000-0x000007FEF641D000-memory.dmp

memory/1748-7-0x0000000002920000-0x00000000029A0000-memory.dmp

memory/1748-8-0x0000000002920000-0x00000000029A0000-memory.dmp

memory/1748-9-0x0000000002920000-0x00000000029A0000-memory.dmp

memory/1748-10-0x000007FEF5A80000-0x000007FEF641D000-memory.dmp

memory/1748-11-0x0000000002920000-0x00000000029A0000-memory.dmp

memory/1748-12-0x0000000002690000-0x00000000026A6000-memory.dmp

memory/1748-13-0x000007FEF5A80000-0x000007FEF641D000-memory.dmp