Malware Analysis Report

2025-03-15 01:12

Sample ID 250225-w7szjs1jz3
Target -.exe
SHA256 fc100f96c82d1e87511907e35b6ee566c0a3f9b3dc1858f1e8d8e88b21f07ea0
Tags
silverrat execution trojan
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

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

fc100f96c82d1e87511907e35b6ee566c0a3f9b3dc1858f1e8d8e88b21f07ea0

Threat Level: Known bad

The file -.exe was found to be: Known bad.

Malicious Activity Summary

silverrat execution trojan

SilverRat

Silverrat family

Checks computer location settings

Command and Scripting Interpreter: PowerShell

Enumerates physical storage devices

Unsigned PE

Scheduled Task/Job: Scheduled Task

Suspicious behavior: EnumeratesProcesses

Suspicious use of SetWindowsHookEx

Suspicious use of WriteProcessMemory

Suspicious use of AdjustPrivilegeToken

Uses Task Scheduler COM API

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2025-02-25 18:34

Signatures

Silverrat family

silverrat

Unsigned PE

Description Indicator Process Target
N/A N/A N/A N/A

Analysis: behavioral1

Detonation Overview

Submitted

2025-02-25 18:34

Reported

2025-02-25 18:36

Platform

win7-20240903-en

Max time kernel

121s

Max time network

150s

Command Line

"C:\Users\Admin\AppData\Local\Temp\-.exe"

Signatures

SilverRat

trojan silverrat

Silverrat family

silverrat

Command and Scripting Interpreter: PowerShell

execution
Description Indicator Process Target
N/A N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A

Enumerates physical storage devices

Scheduled Task/Job: Scheduled Task

persistence execution
Description Indicator Process Target
N/A N/A C:\Windows\system32\schtasks.exe N/A
N/A N/A C:\Windows\System32\schtasks.exe N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\-.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:\Users\Admin\AppData\Local\Temp\-.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\-.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2704 wrote to memory of 2816 N/A C:\Users\Admin\AppData\Local\Temp\-.exe C:\Windows\system32\schtasks.exe
PID 2704 wrote to memory of 2816 N/A C:\Users\Admin\AppData\Local\Temp\-.exe C:\Windows\system32\schtasks.exe
PID 2704 wrote to memory of 2816 N/A C:\Users\Admin\AppData\Local\Temp\-.exe C:\Windows\system32\schtasks.exe
PID 2704 wrote to memory of 2784 N/A C:\Users\Admin\AppData\Local\Temp\-.exe C:\Windows\system32\schtasks.exe
PID 2704 wrote to memory of 2784 N/A C:\Users\Admin\AppData\Local\Temp\-.exe C:\Windows\system32\schtasks.exe
PID 2704 wrote to memory of 2784 N/A C:\Users\Admin\AppData\Local\Temp\-.exe C:\Windows\system32\schtasks.exe
PID 2704 wrote to memory of 2952 N/A C:\Users\Admin\AppData\Local\Temp\-.exe C:\Windows\system32\schtasks.exe
PID 2704 wrote to memory of 2952 N/A C:\Users\Admin\AppData\Local\Temp\-.exe C:\Windows\system32\schtasks.exe
PID 2704 wrote to memory of 2952 N/A C:\Users\Admin\AppData\Local\Temp\-.exe C:\Windows\system32\schtasks.exe
PID 2704 wrote to memory of 2724 N/A C:\Users\Admin\AppData\Local\Temp\-.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 2704 wrote to memory of 2724 N/A C:\Users\Admin\AppData\Local\Temp\-.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 2704 wrote to memory of 2724 N/A C:\Users\Admin\AppData\Local\Temp\-.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 2704 wrote to memory of 2544 N/A C:\Users\Admin\AppData\Local\Temp\-.exe C:\Windows\System32\schtasks.exe
PID 2704 wrote to memory of 2544 N/A C:\Users\Admin\AppData\Local\Temp\-.exe C:\Windows\System32\schtasks.exe
PID 2704 wrote to memory of 2544 N/A C:\Users\Admin\AppData\Local\Temp\-.exe C:\Windows\System32\schtasks.exe

Uses Task Scheduler COM API

persistence

Processes

C:\Users\Admin\AppData\Local\Temp\-.exe

"C:\Users\Admin\AppData\Local\Temp\-.exe"

C:\Windows\system32\schtasks.exe

"schtasks.exe" /query /TN -.exe

C:\Windows\system32\schtasks.exe

"schtasks.exe" /Create /SC ONCE /TN "-.exe" /TR "C:\Users\Admin\AppData\Local\Temp\-.exe \"\-.exe\" /AsAdmin" /ST 00:01 /IT /F /RL HIGHEST

C:\Windows\system32\schtasks.exe

"schtasks.exe" /query /TN -.exe

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe

"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Set-MpPreference -ExclusionExtension exe,bat,dll,ps1;exit

C:\Windows\System32\schtasks.exe

"C:\Windows\System32\schtasks.exe" /create /sc daily /tn "_Task-DAILY-21PM" /TR "%MyFile%" /ST 21:00

Network

Country Destination Domain Proto
US 8.8.8.8:53 paul-nw.gl.at.ply.gg udp
US 147.185.221.25:51413 paul-nw.gl.at.ply.gg tcp

Files

memory/2704-0-0x000007FEF5D13000-0x000007FEF5D14000-memory.dmp

memory/2704-1-0x000000013FD50000-0x000000013FD5E000-memory.dmp

memory/2704-2-0x000007FEF5D10000-0x000007FEF66FC000-memory.dmp

memory/2724-8-0x0000000000690000-0x0000000000698000-memory.dmp

memory/2724-7-0x000000001B6F0000-0x000000001B9D2000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\CabFDA2.tmp

MD5 49aebf8cbd62d92ac215b2923fb1b9f5
SHA1 1723be06719828dda65ad804298d0431f6aff976
SHA256 b33efcb95235b98b48508e019afa4b7655e80cf071defabd8b2123fc8b29307f
SHA512 bf86116b015fb56709516d686e168e7c9c68365136231cc51d0b6542ae95323a71d2c7acec84aad7dcecc2e410843f6d82a0a6d51b9acfc721a9c84fdd877b5b

memory/2704-25-0x000007FEF5D13000-0x000007FEF5D14000-memory.dmp

memory/2704-26-0x000007FEF5D10000-0x000007FEF66FC000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2025-02-25 18:34

Reported

2025-02-25 18:36

Platform

win10v2004-20250217-en

Max time kernel

93s

Max time network

148s

Command Line

"C:\Users\Admin\AppData\Local\Temp\-.exe"

Signatures

SilverRat

trojan silverrat

Silverrat family

silverrat

Checks computer location settings

Description Indicator Process Target
Key value queried \REGISTRY\USER\S-1-5-21-1161330783-2912525651-1278508834-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Local\Temp\-.exe N/A

Command and Scripting Interpreter: PowerShell

execution
Description Indicator Process Target
N/A N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A

Enumerates physical storage devices

Scheduled Task/Job: Scheduled Task

persistence execution
Description Indicator Process Target
N/A N/A C:\Windows\SYSTEM32\schtasks.exe N/A
N/A N/A C:\Windows\System32\schtasks.exe N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\-.exe N/A
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:\Users\Admin\AppData\Local\Temp\-.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\-.exe N/A

Uses Task Scheduler COM API

persistence

Processes

C:\Users\Admin\AppData\Local\Temp\-.exe

"C:\Users\Admin\AppData\Local\Temp\-.exe"

C:\Windows\SYSTEM32\schtasks.exe

"schtasks.exe" /query /TN -.exe

C:\Windows\SYSTEM32\schtasks.exe

"schtasks.exe" /Create /SC ONCE /TN "-.exe" /TR "C:\Users\Admin\AppData\Local\Temp\-.exe \"\-.exe\" /AsAdmin" /ST 00:01 /IT /F /RL HIGHEST

C:\Windows\SYSTEM32\schtasks.exe

"schtasks.exe" /query /TN -.exe

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe

"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Set-MpPreference -ExclusionExtension exe,bat,dll,ps1;exit

C:\Windows\System32\schtasks.exe

"C:\Windows\System32\schtasks.exe" /create /sc daily /tn "_Task-DAILY-21PM" /TR "%MyFile%" /ST 21:00

Network

Country Destination Domain Proto
US 8.8.8.8:53 paul-nw.gl.at.ply.gg udp
US 147.185.221.25:51413 paul-nw.gl.at.ply.gg tcp
US 8.8.8.8:53 g.bing.com udp
US 150.171.27.10:443 g.bing.com tcp
US 8.8.8.8:53 tse1.mm.bing.net udp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 8.8.8.8:53 udp
US 8.8.8.8:53 udp
IT 91.80.49.85:80 tcp
US 8.8.8.8:53 udp

Files

memory/3280-1-0x00007FFB62B93000-0x00007FFB62B95000-memory.dmp

memory/3280-0-0x0000000000CF0000-0x0000000000CFE000-memory.dmp

memory/3280-2-0x00007FFB62B90000-0x00007FFB63651000-memory.dmp

memory/2880-4-0x000001DE29500000-0x000001DE29522000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_mnjjxkm4.4ft.ps1

MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

memory/3280-15-0x00007FFB62B93000-0x00007FFB62B95000-memory.dmp

memory/3280-16-0x00007FFB62B90000-0x00007FFB63651000-memory.dmp