Malware Analysis Report

2025-03-15 01:12

Sample ID 250226-hdn7lsvqw3
Target SilverClient.exe
SHA256 ab51ee1b9d05629f8756c9d552a2e182f6273c34a9cb052e9ba5338667bc5a97
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

ab51ee1b9d05629f8756c9d552a2e182f6273c34a9cb052e9ba5338667bc5a97

Threat Level: Known bad

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

Malicious Activity Summary

silverrat execution trojan

SilverRat

Silverrat family

Executes dropped EXE

Checks computer location settings

Loads dropped DLL

Legitimate hosting services abused for malware hosting/C2

Command and Scripting Interpreter: PowerShell

Unsigned PE

Enumerates physical storage devices

Scheduled Task/Job: Scheduled Task

Delays execution with timeout.exe

Suspicious behavior: EnumeratesProcesses

Suspicious use of SetWindowsHookEx

Suspicious use of WriteProcessMemory

Uses Task Scheduler COM API

Suspicious use of AdjustPrivilegeToken

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2025-02-26 06:37

Signatures

Silverrat family

silverrat

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2025-02-26 06:37

Reported

2025-02-26 06:39

Platform

win7-20250207-en

Max time kernel

149s

Max time network

118s

Command Line

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

Signatures

SilverRat

trojan silverrat

Silverrat family

silverrat

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Users\Admin\HP_Drivers\HP_Updates.exe N/A

Loads dropped DLL

Description Indicator Process Target
N/A N/A C:\Windows\system32\cmd.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

Legitimate hosting services abused for malware hosting/C2

Description Indicator Process Target
N/A discord.com N/A N/A
N/A discord.com N/A 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

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 use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\HP_Drivers\HP_Updates.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\HP_Drivers\HP_Updates.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1904 wrote to memory of 2000 N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe C:\Windows\system32\cmd.exe
PID 1904 wrote to memory of 2000 N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe C:\Windows\system32\cmd.exe
PID 1904 wrote to memory of 2000 N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe C:\Windows\system32\cmd.exe
PID 2000 wrote to memory of 1916 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\timeout.exe
PID 2000 wrote to memory of 1916 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\timeout.exe
PID 2000 wrote to memory of 1916 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\timeout.exe
PID 2000 wrote to memory of 2212 N/A C:\Windows\system32\cmd.exe C:\Users\Admin\HP_Drivers\HP_Updates.exe
PID 2000 wrote to memory of 2212 N/A C:\Windows\system32\cmd.exe C:\Users\Admin\HP_Drivers\HP_Updates.exe
PID 2000 wrote to memory of 2212 N/A C:\Windows\system32\cmd.exe C:\Users\Admin\HP_Drivers\HP_Updates.exe
PID 2212 wrote to memory of 2916 N/A C:\Users\Admin\HP_Drivers\HP_Updates.exe C:\Windows\system32\schtasks.exe
PID 2212 wrote to memory of 2916 N/A C:\Users\Admin\HP_Drivers\HP_Updates.exe C:\Windows\system32\schtasks.exe
PID 2212 wrote to memory of 2916 N/A C:\Users\Admin\HP_Drivers\HP_Updates.exe C:\Windows\system32\schtasks.exe
PID 2212 wrote to memory of 2796 N/A C:\Users\Admin\HP_Drivers\HP_Updates.exe C:\Windows\system32\schtasks.exe
PID 2212 wrote to memory of 2796 N/A C:\Users\Admin\HP_Drivers\HP_Updates.exe C:\Windows\system32\schtasks.exe
PID 2212 wrote to memory of 2796 N/A C:\Users\Admin\HP_Drivers\HP_Updates.exe C:\Windows\system32\schtasks.exe
PID 2212 wrote to memory of 2804 N/A C:\Users\Admin\HP_Drivers\HP_Updates.exe C:\Windows\system32\schtasks.exe
PID 2212 wrote to memory of 2804 N/A C:\Users\Admin\HP_Drivers\HP_Updates.exe C:\Windows\system32\schtasks.exe
PID 2212 wrote to memory of 2804 N/A C:\Users\Admin\HP_Drivers\HP_Updates.exe C:\Windows\system32\schtasks.exe
PID 2212 wrote to memory of 2708 N/A C:\Users\Admin\HP_Drivers\HP_Updates.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 2212 wrote to memory of 2708 N/A C:\Users\Admin\HP_Drivers\HP_Updates.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 2212 wrote to memory of 2708 N/A C:\Users\Admin\HP_Drivers\HP_Updates.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 2212 wrote to memory of 2936 N/A C:\Users\Admin\HP_Drivers\HP_Updates.exe C:\Windows\System32\schtasks.exe
PID 2212 wrote to memory of 2936 N/A C:\Users\Admin\HP_Drivers\HP_Updates.exe C:\Windows\System32\schtasks.exe
PID 2212 wrote to memory of 2936 N/A C:\Users\Admin\HP_Drivers\HP_Updates.exe C:\Windows\System32\schtasks.exe

Uses Task Scheduler COM API

persistence

Processes

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

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

C:\Windows\system32\cmd.exe

cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpC0B0.tmp.bat""

C:\Windows\system32\timeout.exe

timeout 3

C:\Users\Admin\HP_Drivers\HP_Updates.exe

"C:\Users\Admin\HP_Drivers\HP_Updates.exe"

C:\Windows\system32\schtasks.exe

"schtasks.exe" /query /TN HP_Updates.exe

C:\Windows\system32\schtasks.exe

"schtasks.exe" /Create /SC ONCE /TN "HP_Updates.exe" /TR "C:\Users\Admin\HP_Drivers\HP_Updates.exe \"\HP_Updates.exe\" /AsAdmin" /ST 00:01 /IT /F /RL HIGHEST

C:\Windows\system32\schtasks.exe

"schtasks.exe" /query /TN HP_Updates.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 hourly /mo 1 /tn "HP_Updates_Task-HOURLY-01" /tr "%MyFile%" /st 00:00

Network

Country Destination Domain Proto
US 8.8.8.8:53 discord.com udp
US 162.159.128.233:443 discord.com tcp

Files

memory/1904-0-0x000007FEF5B93000-0x000007FEF5B94000-memory.dmp

memory/1904-1-0x000000013F870000-0x000000013F880000-memory.dmp

memory/1904-10-0x000007FEF5B90000-0x000007FEF657C000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\tmpC0B0.tmp.bat

MD5 f123210cf2fb1938b3d9e35cddf1d646
SHA1 1711ece76b142dd2a7d0f2e14fe9fbe84baea05d
SHA256 837c506ae05b7bacd9070e87dad680e54abe86b45c3b0396cf1eb7981fd9abd1
SHA512 6437aa664aa57483a12bbaf88587480a56119d156f1968ceef57b429168fbb2fdb3f93ae73c62f512dbb9de58ba763c041dcf2047e4c09a97ee58c0253900fa2

\Users\Admin\HP_Drivers\HP_Updates.exe

MD5 c312ff9dfd199ae5b504932e018b4d84
SHA1 75ff47cc5fb04726d14df93b9c8804360a74f4ad
SHA256 ab51ee1b9d05629f8756c9d552a2e182f6273c34a9cb052e9ba5338667bc5a97
SHA512 94a1e811451022abc9e408c5ede051d9656ce74383455b3ecb897dba9c1abf1bac21447b42ece811845271639de201d780b9aaab594615636fc59538be3684a7

memory/2212-16-0x000000013FDA0000-0x000000013FDB0000-memory.dmp

memory/2212-17-0x000007FEF51A0000-0x000007FEF5B8C000-memory.dmp

memory/2708-22-0x000000001B580000-0x000000001B862000-memory.dmp

memory/2708-23-0x00000000027F0000-0x00000000027F8000-memory.dmp

memory/1904-24-0x000007FEF5B90000-0x000007FEF657C000-memory.dmp

memory/2212-25-0x000007FEF51A3000-0x000007FEF51A4000-memory.dmp

memory/2212-26-0x000007FEF51A0000-0x000007FEF5B8C000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2025-02-26 06:37

Reported

2025-02-26 06:40

Platform

win10v2004-20250217-en

Max time kernel

148s

Max time network

151s

Command Line

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

Signatures

SilverRat

trojan silverrat

Silverrat family

silverrat

Checks computer location settings

Description Indicator Process Target
Key value queried \REGISTRY\USER\S-1-5-21-1874072718-2205492803-118941907-1000\Control Panel\International\Geo\Nation C:\Users\Admin\HP_Drivers\HP_Updates.exe N/A

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Users\Admin\HP_Drivers\HP_Updates.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

Legitimate hosting services abused for malware hosting/C2

Description Indicator Process Target
N/A discord.com N/A N/A
N/A discord.com N/A 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

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\SilverClient.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.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
N/A N/A C:\Users\Admin\HP_Drivers\HP_Updates.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\HP_Drivers\HP_Updates.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\HP_Drivers\HP_Updates.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1676 wrote to memory of 2180 N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe C:\Windows\system32\cmd.exe
PID 1676 wrote to memory of 2180 N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe C:\Windows\system32\cmd.exe
PID 2180 wrote to memory of 4076 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\timeout.exe
PID 2180 wrote to memory of 4076 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\timeout.exe
PID 2180 wrote to memory of 4032 N/A C:\Windows\system32\cmd.exe C:\Users\Admin\HP_Drivers\HP_Updates.exe
PID 2180 wrote to memory of 4032 N/A C:\Windows\system32\cmd.exe C:\Users\Admin\HP_Drivers\HP_Updates.exe
PID 4032 wrote to memory of 4824 N/A C:\Users\Admin\HP_Drivers\HP_Updates.exe C:\Windows\SYSTEM32\schtasks.exe
PID 4032 wrote to memory of 4824 N/A C:\Users\Admin\HP_Drivers\HP_Updates.exe C:\Windows\SYSTEM32\schtasks.exe
PID 4032 wrote to memory of 884 N/A C:\Users\Admin\HP_Drivers\HP_Updates.exe C:\Windows\SYSTEM32\schtasks.exe
PID 4032 wrote to memory of 884 N/A C:\Users\Admin\HP_Drivers\HP_Updates.exe C:\Windows\SYSTEM32\schtasks.exe
PID 4032 wrote to memory of 1240 N/A C:\Users\Admin\HP_Drivers\HP_Updates.exe C:\Windows\SYSTEM32\schtasks.exe
PID 4032 wrote to memory of 1240 N/A C:\Users\Admin\HP_Drivers\HP_Updates.exe C:\Windows\SYSTEM32\schtasks.exe
PID 4032 wrote to memory of 916 N/A C:\Users\Admin\HP_Drivers\HP_Updates.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 4032 wrote to memory of 916 N/A C:\Users\Admin\HP_Drivers\HP_Updates.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 4032 wrote to memory of 1660 N/A C:\Users\Admin\HP_Drivers\HP_Updates.exe C:\Windows\System32\schtasks.exe
PID 4032 wrote to memory of 1660 N/A C:\Users\Admin\HP_Drivers\HP_Updates.exe C:\Windows\System32\schtasks.exe

Uses Task Scheduler COM API

persistence

Processes

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

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

C:\Windows\system32\cmd.exe

C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpD9D5.tmp.bat""

C:\Windows\system32\timeout.exe

timeout 3

C:\Users\Admin\HP_Drivers\HP_Updates.exe

"C:\Users\Admin\HP_Drivers\HP_Updates.exe"

C:\Windows\SYSTEM32\schtasks.exe

"schtasks.exe" /query /TN HP_Updates.exe

C:\Windows\SYSTEM32\schtasks.exe

"schtasks.exe" /Create /SC ONCE /TN "HP_Updates.exe" /TR "C:\Users\Admin\HP_Drivers\HP_Updates.exe \"\HP_Updates.exe\" /AsAdmin" /ST 00:01 /IT /F /RL HIGHEST

C:\Windows\SYSTEM32\schtasks.exe

"schtasks.exe" /query /TN HP_Updates.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 hourly /mo 1 /tn "HP_Updates_Task-HOURLY-01" /tr "%MyFile%" /st 00:00

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
US 8.8.8.8:53 discord.com udp
US 162.159.137.232:443 discord.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 www.microsoft.com udp
GB 104.115.34.42:80 www.microsoft.com tcp

Files

memory/1676-1-0x00007FFBEECE3000-0x00007FFBEECE5000-memory.dmp

memory/1676-0-0x00000000004D0000-0x00000000004E0000-memory.dmp

memory/1676-2-0x00007FFBEECE0000-0x00007FFBEF7A1000-memory.dmp

memory/1676-7-0x00007FFBEECE0000-0x00007FFBEF7A1000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\tmpD9D5.tmp.bat

MD5 4c23c321524a730960fc5bc95fedd7ab
SHA1 17f29313736dea43bb4086d57e64e8f5a6379d20
SHA256 34b4bad0a5ec4942bf1c50ddf59a614f9c48c816e63df3da22aa37e39b231656
SHA512 bfe8e618e75dcfe9927bea892a01c52dfcb35e96e5a7c674a6d0e5ec9db6d7e6804103610e7eda00f565046024151f50a988f4e94ac4bb56f00283c777d8b0b7

C:\Users\Admin\HP_Drivers\HP_Updates.exe

MD5 c312ff9dfd199ae5b504932e018b4d84
SHA1 75ff47cc5fb04726d14df93b9c8804360a74f4ad
SHA256 ab51ee1b9d05629f8756c9d552a2e182f6273c34a9cb052e9ba5338667bc5a97
SHA512 94a1e811451022abc9e408c5ede051d9656ce74383455b3ecb897dba9c1abf1bac21447b42ece811845271639de201d780b9aaab594615636fc59538be3684a7

memory/4032-12-0x00007FFBEE213000-0x00007FFBEE215000-memory.dmp

memory/4032-13-0x00007FFBEE210000-0x00007FFBEECD1000-memory.dmp

memory/916-14-0x000001A659970000-0x000001A659992000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_fzjaspll.fjl.ps1

MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

memory/4032-26-0x00007FFBEE213000-0x00007FFBEE215000-memory.dmp

memory/4032-27-0x00007FFBEE210000-0x00007FFBEECD1000-memory.dmp