Malware Analysis Report

2025-03-15 01:14

Sample ID 250213-2z8ypaxmgs
Target Rat.cmd
SHA256 47b4d5846a6c1f0f3e9f768f77812e43a4141762bd696aae3c607c98505754b4
Tags
silverrat defense_evasion persistence trojan discovery
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

47b4d5846a6c1f0f3e9f768f77812e43a4141762bd696aae3c607c98505754b4

Threat Level: Known bad

The file Rat.cmd was found to be: Known bad.

Malicious Activity Summary

silverrat defense_evasion persistence trojan discovery

Silverrat family

SilverRat

Sets file to hidden

Downloads MZ/PE file

Checks computer location settings

Adds Run key to start application

Unsigned PE

Enumerates physical storage devices

System Network Configuration Discovery: Internet Connection Discovery

System Location Discovery: System Language Discovery

Suspicious use of AdjustPrivilegeToken

Uses Volume Shadow Copy service COM API

Suspicious behavior: EnumeratesProcesses

Delays execution with timeout.exe

Views/modifies file attributes

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2025-02-13 23:02

Signatures

Silverrat family

silverrat

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2025-02-13 23:02

Reported

2025-02-13 23:04

Platform

win7-20241010-en

Max time kernel

120s

Max time network

122s

Command Line

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

Signatures

SilverRat

trojan silverrat

Silverrat family

silverrat

Sets file to hidden

defense_evasion
Description Indicator Process Target
N/A N/A C:\Windows\System32\attrib.exe N/A
N/A N/A C:\Windows\System32\attrib.exe N/A

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\ = "\"C:\\Users\\Admin\\AppData\\Roaming\\zt-WD\\$77Windows Security Process.cmd\"" C:\Users\Admin\AppData\Local\Temp\Rat.exe N/A

Enumerates physical storage devices

Delays execution with timeout.exe

defense_evasion
Description Indicator Process Target
N/A N/A C:\Windows\system32\timeout.exe N/A

Suspicious behavior: EnumeratesProcesses

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

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeBackupPrivilege N/A C:\Windows\system32\vssvc.exe N/A
Token: SeRestorePrivilege N/A C:\Windows\system32\vssvc.exe N/A
Token: SeAuditPrivilege N/A C:\Windows\system32\vssvc.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\Rat.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1624 wrote to memory of 2256 N/A C:\Users\Admin\AppData\Local\Temp\Rat.exe C:\Windows\System32\attrib.exe
PID 1624 wrote to memory of 2256 N/A C:\Users\Admin\AppData\Local\Temp\Rat.exe C:\Windows\System32\attrib.exe
PID 1624 wrote to memory of 2256 N/A C:\Users\Admin\AppData\Local\Temp\Rat.exe C:\Windows\System32\attrib.exe
PID 1624 wrote to memory of 1604 N/A C:\Users\Admin\AppData\Local\Temp\Rat.exe C:\Windows\System32\attrib.exe
PID 1624 wrote to memory of 1604 N/A C:\Users\Admin\AppData\Local\Temp\Rat.exe C:\Windows\System32\attrib.exe
PID 1624 wrote to memory of 1604 N/A C:\Users\Admin\AppData\Local\Temp\Rat.exe C:\Windows\System32\attrib.exe
PID 1624 wrote to memory of 3024 N/A C:\Users\Admin\AppData\Local\Temp\Rat.exe C:\Windows\system32\cmd.exe
PID 1624 wrote to memory of 3024 N/A C:\Users\Admin\AppData\Local\Temp\Rat.exe C:\Windows\system32\cmd.exe
PID 1624 wrote to memory of 3024 N/A C:\Users\Admin\AppData\Local\Temp\Rat.exe C:\Windows\system32\cmd.exe
PID 3024 wrote to memory of 1704 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\timeout.exe
PID 3024 wrote to memory of 1704 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\timeout.exe
PID 3024 wrote to memory of 1704 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\timeout.exe
PID 3024 wrote to memory of 1932 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\cmd.exe
PID 3024 wrote to memory of 1932 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\cmd.exe
PID 3024 wrote to memory of 1932 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\cmd.exe

Uses Volume Shadow Copy service COM API

ransomware

Views/modifies file attributes

defense_evasion
Description Indicator Process Target
N/A N/A C:\Windows\System32\attrib.exe N/A
N/A N/A C:\Windows\System32\attrib.exe N/A

Processes

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

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

C:\Windows\system32\vssvc.exe

C:\Windows\system32\vssvc.exe

C:\Windows\System32\attrib.exe

"C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\AppData\Roaming\zt-WD"

C:\Windows\System32\attrib.exe

"C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\AppData\Roaming\zt-WD\$77Windows Security Process.cmd"

C:\Windows\system32\cmd.exe

cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmp19A8.tmp.bat""

C:\Windows\system32\timeout.exe

timeout 3

C:\Windows\system32\cmd.exe

C:\Windows\system32\cmd.exe /K "C:\Users\Admin\AppData\Roaming\zt-WD\$77Windows Security Process.cmd"

Network

N/A

Files

memory/1624-0-0x000007FEF5AB3000-0x000007FEF5AB4000-memory.dmp

memory/1624-1-0x0000000000C20000-0x0000000000C32000-memory.dmp

memory/1624-2-0x000007FEF5AB0000-0x000007FEF649C000-memory.dmp

memory/1624-3-0x000007FEF5AB3000-0x000007FEF5AB4000-memory.dmp

memory/1624-4-0x000007FEF5AB0000-0x000007FEF649C000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\tmp19A8.tmp.bat

MD5 1a27728f96418ea36b3b1e59f614b46a
SHA1 0aa70aa1018c9612315d69e49be252341a52a725
SHA256 96eefa27a8acd1c5411f6589d7c6feafa351ac70d09f3d8c1736a6d6ef2f8454
SHA512 e89b0b75b8feb25b855730c61835f222021bee09582d8342ad7f8dc3907f99e7bfcb4066f01a95b47ccbd796b6bde45655457cfcc5b0d699d6aec47cae12672b

memory/1624-14-0x000007FEF5AB0000-0x000007FEF649C000-memory.dmp

C:\Users\Admin\AppData\Roaming\zt-WD\$77Windows Security Process.cmd

MD5 ed4f6318bf888ff72c0bae8bf85581ca
SHA1 4ec21563af9c278b8bb7626a967894cba16db268
SHA256 47b4d5846a6c1f0f3e9f768f77812e43a4141762bd696aae3c607c98505754b4
SHA512 af021e7f2d76182bacd6d99448a6f02d5a60567af0925f2a7311b640fe922d88088f4d2368011fd320c41cf7baa77d8c504e9faf28bfdddd460769e74b52054b

Analysis: behavioral2

Detonation Overview

Submitted

2025-02-13 23:02

Reported

2025-02-13 23:04

Platform

win10v2004-20250207-en

Max time kernel

94s

Max time network

150s

Command Line

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

Signatures

SilverRat

trojan silverrat

Silverrat family

silverrat

Downloads MZ/PE file

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

Sets file to hidden

defense_evasion
Description Indicator Process Target
N/A N/A C:\Windows\System32\attrib.exe N/A
N/A N/A C:\Windows\System32\attrib.exe N/A

Checks computer location settings

Description Indicator Process Target
Key value queried \REGISTRY\USER\S-1-5-21-189444705-1272902858-1305688695-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Local\Temp\Rat.exe N/A

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\ = "\"C:\\Users\\Admin\\AppData\\Roaming\\zt-WD\\$77Windows Security Process.cmd\"" C:\Users\Admin\AppData\Local\Temp\Rat.exe N/A

Enumerates physical storage devices

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe N/A

System Network Configuration Discovery: Internet Connection Discovery

discovery
Description Indicator Process Target
N/A N/A C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe N/A

Delays execution with timeout.exe

defense_evasion
Description Indicator Process Target
N/A N/A C:\Windows\system32\timeout.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeBackupPrivilege N/A C:\Windows\system32\vssvc.exe N/A
Token: SeRestorePrivilege N/A C:\Windows\system32\vssvc.exe N/A
Token: SeAuditPrivilege N/A C:\Windows\system32\vssvc.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\Rat.exe N/A
Token: 33 N/A C:\Windows\system32\AUDIODG.EXE N/A
Token: SeIncBasePriorityPrivilege N/A C:\Windows\system32\AUDIODG.EXE N/A

Uses Volume Shadow Copy service COM API

ransomware

Views/modifies file attributes

defense_evasion
Description Indicator Process Target
N/A N/A C:\Windows\System32\attrib.exe N/A
N/A N/A C:\Windows\System32\attrib.exe N/A

Processes

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

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

C:\Windows\system32\vssvc.exe

C:\Windows\system32\vssvc.exe

C:\Windows\System32\attrib.exe

"C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\AppData\Roaming\zt-WD"

C:\Windows\System32\attrib.exe

"C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\AppData\Roaming\zt-WD\$77Windows Security Process.cmd"

C:\Windows\system32\cmd.exe

C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpFBC5.tmp.bat""

C:\Windows\system32\timeout.exe

timeout 3

C:\Windows\system32\cmd.exe

C:\Windows\system32\cmd.exe /K "C:\Users\Admin\AppData\Roaming\zt-WD\$77Windows Security Process.cmd"

C:\Windows\system32\AUDIODG.EXE

C:\Windows\system32\AUDIODG.EXE 0x394 0x2ec

C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe

"C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe" /ping 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-PGFwcCBhcHBpZD0iezhBNjlEMzQ1LUQ1NjQtNDYzYy1BRkYxLUE2OUQ5RTUzMEY5Nn0iIHZlcnNpb249IjEyMy4wLjYzMTIuMTIzIiBuZXh0dmVyc2lvbj0iIiBsYW5nPSJlbiIgYnJhbmQ9IkdHTFMiIGNsaWVudD0iIiBpbnN0YWxsYWdlPSI2IiBpbnN0YWxsZGF0ZXRpbWU9IjE3Mzg5NDU5MjEiIG9vYmVfaW5zdGFsbF90aW1lPSIxMzM4MzQxODE5ODA3NzAwMDAiPjxldmVudCBldmVudHR5cGU9IjMxIiBldmVudHJlc3VsdD0iMSIgZXJyb3Jjb2RlPSIwIiBleHRyYWNvZGUxPSIyMTc5ODYyIiBzeXN0ZW1fdXB0aW1lX3RpY2tzPSI1MjA4NjU5NDQ2Ii8-PC9hcHA-PC9yZXF1ZXN0Pg

Network

Country Destination Domain Proto
US 8.8.8.8:53 g.bing.com udp
US 150.171.28.10:443 g.bing.com tcp
GB 2.18.66.129:443 www.bing.com tcp
US 8.8.8.8:53 msedge.api.cdp.microsoft.com udp
NL 4.175.87.113:443 msedge.api.cdp.microsoft.com tcp
US 8.8.8.8:53 msedge.b.tlu.dl.delivery.mp.microsoft.com udp
US 199.232.210.172:80 msedge.b.tlu.dl.delivery.mp.microsoft.com tcp

Files

memory/4224-1-0x0000000000C10000-0x0000000000C22000-memory.dmp

memory/4224-0-0x00007FF80C273000-0x00007FF80C275000-memory.dmp

memory/4224-2-0x00007FF80C270000-0x00007FF80CD31000-memory.dmp

memory/4224-3-0x00007FF80C273000-0x00007FF80C275000-memory.dmp

memory/4224-4-0x00007FF80C270000-0x00007FF80CD31000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\tmpFBC5.tmp.bat

MD5 4ec0f72855751cb8f9ed9a75202a0321
SHA1 df79ed8f57ad4732906b89b62a3369f257a7be8c
SHA256 147327157f7279f8d101645c9491cbb4ebd9bf663f5b46b2c8e3729da1811353
SHA512 5975c5591d38ff284afad3b2d789223dfa675a08d94bde42be40ee4671ed98a9d87d544f52a2d2f3ba2b0a91894e45f6416927fe370a137c05f231aab74a608b

memory/4224-10-0x00007FF80C270000-0x00007FF80CD31000-memory.dmp

C:\Users\Admin\AppData\Roaming\zt-WD\$77Windows Security Process.cmd

MD5 ed4f6318bf888ff72c0bae8bf85581ca
SHA1 4ec21563af9c278b8bb7626a967894cba16db268
SHA256 47b4d5846a6c1f0f3e9f768f77812e43a4141762bd696aae3c607c98505754b4
SHA512 af021e7f2d76182bacd6d99448a6f02d5a60567af0925f2a7311b640fe922d88088f4d2368011fd320c41cf7baa77d8c504e9faf28bfdddd460769e74b52054b