Malware Analysis Report

2025-03-15 01:11

Sample ID 250213-2abxnaxkbz
Target Rat.cmd
SHA256 d4150267caf26aadec004b322be81e568d4e6c1793a5a490eee82326c20ca5fe
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

d4150267caf26aadec004b322be81e568d4e6c1793a5a490eee82326c20ca5fe

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

Downloads MZ/PE file

Sets file to hidden

Checks computer location settings

Adds Run key to start application

Unsigned PE

System Location Discovery: System Language Discovery

Enumerates physical storage devices

System Network Configuration Discovery: Internet Connection Discovery

Suspicious use of AdjustPrivilegeToken

Suspicious behavior: EnumeratesProcesses

Views/modifies file attributes

Delays execution with timeout.exe

Suspicious use of WriteProcessMemory

Uses Volume Shadow Copy service COM API

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2025-02-13 22:22

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 22:22

Reported

2025-02-13 22:24

Platform

win7-20241010-en

Max time kernel

37s

Max time network

19s

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

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 2600 wrote to memory of 1892 N/A C:\Users\Admin\AppData\Local\Temp\Rat.exe C:\Windows\System32\attrib.exe
PID 2600 wrote to memory of 1892 N/A C:\Users\Admin\AppData\Local\Temp\Rat.exe C:\Windows\System32\attrib.exe
PID 2600 wrote to memory of 1892 N/A C:\Users\Admin\AppData\Local\Temp\Rat.exe C:\Windows\System32\attrib.exe
PID 2600 wrote to memory of 2084 N/A C:\Users\Admin\AppData\Local\Temp\Rat.exe C:\Windows\System32\attrib.exe
PID 2600 wrote to memory of 2084 N/A C:\Users\Admin\AppData\Local\Temp\Rat.exe C:\Windows\System32\attrib.exe
PID 2600 wrote to memory of 2084 N/A C:\Users\Admin\AppData\Local\Temp\Rat.exe C:\Windows\System32\attrib.exe
PID 2600 wrote to memory of 2312 N/A C:\Users\Admin\AppData\Local\Temp\Rat.exe C:\Windows\system32\cmd.exe
PID 2600 wrote to memory of 2312 N/A C:\Users\Admin\AppData\Local\Temp\Rat.exe C:\Windows\system32\cmd.exe
PID 2600 wrote to memory of 2312 N/A C:\Users\Admin\AppData\Local\Temp\Rat.exe C:\Windows\system32\cmd.exe
PID 2312 wrote to memory of 2388 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\timeout.exe
PID 2312 wrote to memory of 2388 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\timeout.exe
PID 2312 wrote to memory of 2388 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\timeout.exe
PID 2312 wrote to memory of 1436 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\cmd.exe
PID 2312 wrote to memory of 1436 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\cmd.exe
PID 2312 wrote to memory of 1436 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\tmpF68F.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/2600-0-0x000007FEF6253000-0x000007FEF6254000-memory.dmp

memory/2600-1-0x0000000000160000-0x0000000000172000-memory.dmp

memory/2600-2-0x000007FEF6250000-0x000007FEF6C3C000-memory.dmp

memory/2600-3-0x000007FEF6253000-0x000007FEF6254000-memory.dmp

memory/2600-4-0x000007FEF6250000-0x000007FEF6C3C000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\tmpF68F.tmp.bat

MD5 d93a0348edc343cbd060387bf78aad63
SHA1 cd1904f5d8735cdb4dea5d0edc828675bf9e635b
SHA256 de7efa32cbd56ba9def0ca16407aa591e91d033f80072d887291c89b38eb30a8
SHA512 6cefcdd9abdf2461b044fc43ae1584bca8fc117e551104c8ab2d73a94b0fd258d575df4ac65b679ac5878c03f3144aca226d266a99abfbf74e3157dc145c46e4

memory/2600-14-0x000007FEF6250000-0x000007FEF6C3C000-memory.dmp

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

MD5 87c5cb6446b50bffabd5d4f45b823ae2
SHA1 967f577daf5906008e4d2a511306d9d0ebc8f9c5
SHA256 d4150267caf26aadec004b322be81e568d4e6c1793a5a490eee82326c20ca5fe
SHA512 691bd612a79ac1e65c5ca8d4e5448b9438115de30875db0e980dba647ff67936c56df28ebc361139aa376eecfacfe1badbe08389aae874aeab6f77037d66208f

Analysis: behavioral2

Detonation Overview

Submitted

2025-02-13 22:22

Reported

2025-02-13 22:24

Platform

win10v2004-20250211-en

Max time kernel

149s

Max time network

153s

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-1-5-21-2508704002-2325818048-3575902788-1000\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\tmp36BB.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 0x470 0x4c8

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

"C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe" /ping 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-PGFwcCBhcHBpZD0iezhBNjlEMzQ1LUQ1NjQtNDYzYy1BRkYxLUE2OUQ5RTUzMEY5Nn0iIHZlcnNpb249IjEyMy4wLjYzMTIuMTIzIiBuZXh0dmVyc2lvbj0iIiBsYW5nPSJlbiIgYnJhbmQ9IkdHTFMiIGNsaWVudD0iIiBpbnN0YWxsYWdlPSIyIiBpbnN0YWxsZGF0ZXRpbWU9IjE3MzkyODMyMzYiIG9vYmVfaW5zdGFsbF90aW1lPSIxMzM4Mzc1NDI1MTE0ODAwMDAiPjxldmVudCBldmVudHR5cGU9IjMxIiBldmVudHJlc3VsdD0iMSIgZXJyb3Jjb2RlPSIwIiBleHRyYWNvZGUxPSIyMTc5ODYyIiBzeXN0ZW1fdXB0aW1lX3RpY2tzPSI1NDMzMDMxNDM4Ii8-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 2.18.66.114:443 www.bing.com tcp
US 8.8.8.8:53 msedge.api.cdp.microsoft.com udp
US 52.252.28.242:443 msedge.api.cdp.microsoft.com tcp
US 8.8.8.8:53 msedge.b.tlu.dl.delivery.mp.microsoft.com udp
US 199.232.214.172:80 msedge.b.tlu.dl.delivery.mp.microsoft.com tcp

Files

memory/1528-0-0x00007FFE1F2F3000-0x00007FFE1F2F5000-memory.dmp

memory/1528-1-0x0000000000B60000-0x0000000000B72000-memory.dmp

memory/1528-2-0x00007FFE1F2F0000-0x00007FFE1FDB1000-memory.dmp

memory/1528-3-0x00007FFE1F2F3000-0x00007FFE1F2F5000-memory.dmp

memory/1528-4-0x00007FFE1F2F0000-0x00007FFE1FDB1000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\tmp36BB.tmp.bat

MD5 dcf3cb813d0b68b72b84c632524bbdbe
SHA1 5402eb2a8faefd8ec1a0cef7b7e3cb392f9a9db0
SHA256 a8a5436c1e1a72fcc4d39c300d1823c5d1c096f8994e362ad2c7c980a91f4622
SHA512 7ed1a9e4247da7503b29e16b3317a38aa11b847ee21acb17935036d6ccf141d091bbd06b2f00443de7be175d94ede492d33a4dab5b3b9757453d1965208960f2

memory/1528-10-0x00007FFE1F2F0000-0x00007FFE1FDB1000-memory.dmp

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

MD5 87c5cb6446b50bffabd5d4f45b823ae2
SHA1 967f577daf5906008e4d2a511306d9d0ebc8f9c5
SHA256 d4150267caf26aadec004b322be81e568d4e6c1793a5a490eee82326c20ca5fe
SHA512 691bd612a79ac1e65c5ca8d4e5448b9438115de30875db0e980dba647ff67936c56df28ebc361139aa376eecfacfe1badbe08389aae874aeab6f77037d66208f