silverrat | 632afc11c1652f563a31015c766ce4d8f0d7ea34a5668511e7c08113e657cd3d

Analysis

max time kernel
149s
max time network
150s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
09-01-2025 11:34

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General

Target

SilverClient.exe
Size

43KB
MD5

7ca038b550ee364bc39ba3ebbfc0fb0e
SHA1

45969aca7d7850aa2fd1b1c3c03a65919effb899
SHA256

632afc11c1652f563a31015c766ce4d8f0d7ea34a5668511e7c08113e657cd3d
SHA512

c4d6b8aeb3397245591f2453ec0f4e55fd5333cb14b0c0fc82d0843cca925236a1143d52705cf2988580901e7bf122dc8c197da28c436fde633c244c127624c5
SSDEEP

768:JZiylKt1aCmWgYV6OZi/MiZHFPsxnEsJCSZbYvlGGooooizJjwRUT0v9S9HbExhI:JZigKtFIOZvGFPsxnEFWJjwGAv9KbExy

Score

10^/10

silverrat evasion execution persistence trojan

Malware Config

Extracted

Family

silverrat

Version

1.0.0.0

speed-janet.gl.at.ply.gg:2217

Mutex

SilverMutex_pJwESYkGuV

Attributes

certificate
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
decrypted_key
-|S.S.S|-
key
yy6zDjAUmbB09pKvo5Hhug==
key_x509
UXF3ckpSV0ZzZnhEVFJ3b2FDUkZJSm5UamFDcUVR
reconnect_delay
4
server_signature
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

Signatures

SilverRat
SilverRat is trojan written in C#.
trojan silverrat
Silverrat family
silverrat

Sets file to hidden 1 TTPs 2 IoCs

Modifies file attributes to stop it showing in Explorer etc.

evasion

Hidden Files and Directories

T1564.001

pid	Process
1336	attrib.exe
2084	attrib.exe

Executes dropped EXE 1 IoCs

pid	Process
2804	$77SecurityHealthSystray.exe.exe

Loads dropped DLL 1 IoCs

pid	Process
2832	cmd.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\ = "\"C:\\Users\\Admin\\root\\$77SecurityHealthSystray.exe.exe\""	SilverClient.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
992	powershell.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2844	timeout.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
2840	schtasks.exe
2632	schtasks.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
1704	SilverClient.exe
1704	SilverClient.exe
1704	SilverClient.exe
2804	$77SecurityHealthSystray.exe.exe
992	powershell.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	1704	SilverClient.exe
Token: SeDebugPrivilege	2804	$77SecurityHealthSystray.exe.exe
Token: SeDebugPrivilege	992	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2804	$77SecurityHealthSystray.exe.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 1704 wrote to memory of 2084	1704	SilverClient.exe	30
PID 1704 wrote to memory of 2084	1704	SilverClient.exe	30
PID 1704 wrote to memory of 2084	1704	SilverClient.exe	30
PID 1704 wrote to memory of 1336	1704	SilverClient.exe	32
PID 1704 wrote to memory of 1336	1704	SilverClient.exe	32
PID 1704 wrote to memory of 1336	1704	SilverClient.exe	32
PID 1704 wrote to memory of 2832	1704	SilverClient.exe	35
PID 1704 wrote to memory of 2832	1704	SilverClient.exe	35
PID 1704 wrote to memory of 2832	1704	SilverClient.exe	35
PID 2832 wrote to memory of 2844	2832	cmd.exe	37
PID 2832 wrote to memory of 2844	2832	cmd.exe	37
PID 2832 wrote to memory of 2844	2832	cmd.exe	37
PID 2832 wrote to memory of 2804	2832	cmd.exe	38
PID 2832 wrote to memory of 2804	2832	cmd.exe	38
PID 2832 wrote to memory of 2804	2832	cmd.exe	38
PID 2804 wrote to memory of 2068	2804	$77SecurityHealthSystray.exe.exe	39
PID 2804 wrote to memory of 2068	2804	$77SecurityHealthSystray.exe.exe	39
PID 2804 wrote to memory of 2068	2804	$77SecurityHealthSystray.exe.exe	39
PID 2804 wrote to memory of 2632	2804	$77SecurityHealthSystray.exe.exe	41
PID 2804 wrote to memory of 2632	2804	$77SecurityHealthSystray.exe.exe	41
PID 2804 wrote to memory of 2632	2804	$77SecurityHealthSystray.exe.exe	41
PID 2804 wrote to memory of 2692	2804	$77SecurityHealthSystray.exe.exe	43
PID 2804 wrote to memory of 2692	2804	$77SecurityHealthSystray.exe.exe	43
PID 2804 wrote to memory of 2692	2804	$77SecurityHealthSystray.exe.exe	43
PID 2804 wrote to memory of 992	2804	$77SecurityHealthSystray.exe.exe	45
PID 2804 wrote to memory of 992	2804	$77SecurityHealthSystray.exe.exe	45
PID 2804 wrote to memory of 992	2804	$77SecurityHealthSystray.exe.exe	45
PID 2804 wrote to memory of 2840	2804	$77SecurityHealthSystray.exe.exe	47
PID 2804 wrote to memory of 2840	2804	$77SecurityHealthSystray.exe.exe	47
PID 2804 wrote to memory of 2840	2804	$77SecurityHealthSystray.exe.exe	47

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

Views/modifies file attributes 1 TTPs 2 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
2084	attrib.exe
1336	attrib.exe

C:\Users\Admin\AppData\Local\Temp\SilverClient.exe
"C:\Users\Admin\AppData\Local\Temp\SilverClient.exe"
1⤵
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1704
- C:\Windows\System32\attrib.exe
  "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\root"
  2⤵
  - Sets file to hidden
  - Views/modifies file attributes
  PID:2084
- C:\Windows\System32\attrib.exe
  "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\root\$77SecurityHealthSystray.exe.exe"
  2⤵
  - Sets file to hidden
  - Views/modifies file attributes
  PID:1336
- C:\Windows\system32\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmp963.tmp.bat""
  2⤵
  - Loads dropped DLL
  - Suspicious use of WriteProcessMemory
  PID:2832
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:2844
- - C:\Users\Admin\root\$77SecurityHealthSystray.exe.exe
    "C:\Users\Admin\root\$77SecurityHealthSystray.exe.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:2804
  - - C:\Windows\system32\schtasks.exe
      "schtasks.exe" /query /TN $77SecurityHealthSystray.exe.exe
      4⤵
      PID:2068
  - - C:\Windows\system32\schtasks.exe
      "schtasks.exe" /Create /SC ONCE /TN "$77SecurityHealthSystray.exe.exe" /TR "C:\Users\Admin\root\$77SecurityHealthSystray.exe.exe \"\$77SecurityHealthSystray.exe.exe\" /AsAdmin" /ST 00:01 /IT /F /RL HIGHEST
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:2632
  - - C:\Windows\system32\schtasks.exe
      "schtasks.exe" /query /TN $77SecurityHealthSystray.exe.exe
      4⤵
      PID:2692
  - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Set-MpPreference -ExclusionExtension exe,bat,dll,ps1;exit
      4⤵
      Command and Scripting Interpreter: PowerShell
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:992
  - - C:\Windows\System32\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /create /sc hourly /mo 1 /tn "SecurityHealthSystray.exe_Task-HOURLY-01" /tr "%MyFile%" /st 00:00
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:2840

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Hide Artifacts

T1564

Hidden Files and Directories

T1564.001

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmp963.tmp.bat

Filesize
160B

MD5
3867eea70ee6dd876e3051f783c51168

SHA1
4944d0c5a82e0b4b96238c3fab81d2d7d01690d0

SHA256
668bd62ccbc186ea800bfdf22e72b2f1166bcd35bd3525e22bf0dea6f7e973cd

SHA512
d60ad0645d4d92a5b1b084004f4639336e55b9c8329534d5c9b3849071bdce43a715f51ae439e741ff16264ced22cbee3f2e3e332913b7ce35305f69cfa0f3f5

Download Submit
\Users\Admin\root\$77SecurityHealthSystray.exe.exe

Filesize
43KB

MD5
7ca038b550ee364bc39ba3ebbfc0fb0e

SHA1
45969aca7d7850aa2fd1b1c3c03a65919effb899

SHA256
632afc11c1652f563a31015c766ce4d8f0d7ea34a5668511e7c08113e657cd3d

SHA512
c4d6b8aeb3397245591f2453ec0f4e55fd5333cb14b0c0fc82d0843cca925236a1143d52705cf2988580901e7bf122dc8c197da28c436fde633c244c127624c5

Download Submit
memory/992-24-0x000000001B7D0000-0x000000001BAB2000-memory.dmp

Filesize
2.9MB

Download
memory/992-25-0x0000000001DD0000-0x0000000001DD8000-memory.dmp

Filesize
32KB

Download
memory/1704-0-0x000007FEF5F83000-0x000007FEF5F84000-memory.dmp

Filesize
4KB

Download
memory/1704-1-0x000000013F640000-0x000000013F650000-memory.dmp

Filesize
64KB

Download
memory/1704-2-0x000007FEF5F80000-0x000007FEF696C000-memory.dmp

Filesize
9.9MB

Download
memory/1704-3-0x000007FEF5F83000-0x000007FEF5F84000-memory.dmp

Filesize
4KB

Download
memory/1704-4-0x000007FEF5F80000-0x000007FEF696C000-memory.dmp

Filesize
9.9MB

Download
memory/1704-14-0x000007FEF5F80000-0x000007FEF696C000-memory.dmp

Filesize
9.9MB

Download
memory/2804-19-0x000000013FC90000-0x000000013FCA0000-memory.dmp

Filesize
64KB

Download