silverrat | 7be0033e27b08c8e5f43200259ce3bfd1129b653789664c175342fb3fcb9405a

Analysis

max time kernel
135s
max time network
145s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
29/11/2024, 22:30

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General

Target

SilverClient.exe
Size

43KB
MD5

79d47169908067917d7b01838e512d4e
SHA1

f9e4dbfad432da6bf68b72e60fed8b39b0465fdd
SHA256

7be0033e27b08c8e5f43200259ce3bfd1129b653789664c175342fb3fcb9405a
SHA512

f72a331379d8d595843b4515d96286871e4cfdc3c866c1cc0a6779a1e6b0b127cd2eea2615ab78f754b1c0fb0c51ed33ee02975945539f532ce597e5f68a875e
SSDEEP

768:9uIQbKCHbymqTYV6O1i/MiZHFPsenEsJCSZbYvlGGooooizJjVRUT0v9SFHXhXBu:UIEKCtIO1nGFPsenEFWJjVGAv9OBoY/Y

Score

10^/10

silverrat evasion execution persistence trojan

Malware Config

Extracted

Family

silverrat

Version

1.0.0.0

following-geometry.gl.at.ply.gg:11493

Mutex

SilverMutex_VEYRwaRvUo

Attributes

certificate
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
decrypted_key
-|S.S.S|-
key
yy6zDjAUmbB09pKvo5Hhug==
key_x509
U0tZRVJueVNXY2NSek1admhOVFlpc0JFcFJHbWVN
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
2300	attrib.exe
1748	attrib.exe

Executes dropped EXE 1 IoCs

pid	Process
2684	$77Ponispro.exe

Loads dropped DLL 1 IoCs

pid	Process
3048	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\\AppData\\Roaming\\system64\\$77Ponispro.exe\""	SilverClient.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
2536	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
2712	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
2720	schtasks.exe
2548	schtasks.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2860	SilverClient.exe
2860	SilverClient.exe
2684	$77Ponispro.exe
2536	powershell.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	2860	SilverClient.exe
Token: SeDebugPrivilege	2684	$77Ponispro.exe
Token: SeDebugPrivilege	2536	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2684	$77Ponispro.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 2860 wrote to memory of 2300	2860	SilverClient.exe	28
PID 2860 wrote to memory of 2300	2860	SilverClient.exe	28
PID 2860 wrote to memory of 2300	2860	SilverClient.exe	28
PID 2860 wrote to memory of 1748	2860	SilverClient.exe	30
PID 2860 wrote to memory of 1748	2860	SilverClient.exe	30
PID 2860 wrote to memory of 1748	2860	SilverClient.exe	30
PID 2860 wrote to memory of 3048	2860	SilverClient.exe	34
PID 2860 wrote to memory of 3048	2860	SilverClient.exe	34
PID 2860 wrote to memory of 3048	2860	SilverClient.exe	34
PID 3048 wrote to memory of 2712	3048	cmd.exe	36
PID 3048 wrote to memory of 2712	3048	cmd.exe	36
PID 3048 wrote to memory of 2712	3048	cmd.exe	36
PID 3048 wrote to memory of 2684	3048	cmd.exe	37
PID 3048 wrote to memory of 2684	3048	cmd.exe	37
PID 3048 wrote to memory of 2684	3048	cmd.exe	37
PID 2684 wrote to memory of 2644	2684	$77Ponispro.exe	38
PID 2684 wrote to memory of 2644	2684	$77Ponispro.exe	38
PID 2684 wrote to memory of 2644	2684	$77Ponispro.exe	38
PID 2684 wrote to memory of 2720	2684	$77Ponispro.exe	40
PID 2684 wrote to memory of 2720	2684	$77Ponispro.exe	40
PID 2684 wrote to memory of 2720	2684	$77Ponispro.exe	40
PID 2684 wrote to memory of 2620	2684	$77Ponispro.exe	42
PID 2684 wrote to memory of 2620	2684	$77Ponispro.exe	42
PID 2684 wrote to memory of 2620	2684	$77Ponispro.exe	42
PID 2684 wrote to memory of 2536	2684	$77Ponispro.exe	44
PID 2684 wrote to memory of 2536	2684	$77Ponispro.exe	44
PID 2684 wrote to memory of 2536	2684	$77Ponispro.exe	44
PID 2684 wrote to memory of 2548	2684	$77Ponispro.exe	46
PID 2684 wrote to memory of 2548	2684	$77Ponispro.exe	46
PID 2684 wrote to memory of 2548	2684	$77Ponispro.exe	46

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
1748	attrib.exe
2300	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:2860
- C:\Windows\System32\attrib.exe
  "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\AppData\Roaming\system64"
  2⤵
  - Sets file to hidden
  - Views/modifies file attributes
  PID:2300
- C:\Windows\System32\attrib.exe
  "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\AppData\Roaming\system64\$77Ponispro.exe"
  2⤵
  - Sets file to hidden
  - Views/modifies file attributes
  PID:1748
- C:\Windows\system32\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpE051.tmp.bat""
  2⤵
  - Loads dropped DLL
  - Suspicious use of WriteProcessMemory
  PID:3048
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:2712
- - C:\Users\Admin\AppData\Roaming\system64\$77Ponispro.exe
    "C:\Users\Admin\AppData\Roaming\system64\$77Ponispro.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:2684
  - - C:\Windows\system32\schtasks.exe
      "schtasks.exe" /query /TN $77Ponispro.exe
      4⤵
      PID:2644
  - - C:\Windows\system32\schtasks.exe
      "schtasks.exe" /Create /SC ONCE /TN "$77Ponispro.exe" /TR "C:\Users\Admin\AppData\Roaming\system64\$77Ponispro.exe \"\$77Ponispro.exe\" /AsAdmin" /ST 00:01 /IT /F /RL HIGHEST
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:2720
  - - C:\Windows\system32\schtasks.exe
      "schtasks.exe" /query /TN $77Ponispro.exe
      4⤵
      PID:2620
  - - 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:2536
  - - C:\Windows\System32\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /create /sc hourly /mo 1 /tn "Ponispro_Task-HOURLY-01" /tr "%MyFile%" /st 00:00
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:2548

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

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmpE051.tmp.bat

Filesize
164B

MD5
80cf73bd7a058cc04cc6001836e6c6ee

SHA1
13a05102df1dcbbb5f2b5084a4d8a6e89f644be0

SHA256
71b6dd33557fe171da5dd9d6d9bd9d8721ef363e719bcf22e79be09f2b78c2e4

SHA512
bf8b0379987e613b1c853f516add0d8076b2630121a92ff48a5869d0893e401a46c85887f6a718ea85538ed119aa1b398e4de436e54587c7e04d5af1983dd22d

Download Submit
\Users\Admin\AppData\Roaming\system64\$77Ponispro.exe

Filesize
43KB

MD5
79d47169908067917d7b01838e512d4e

SHA1
f9e4dbfad432da6bf68b72e60fed8b39b0465fdd

SHA256
7be0033e27b08c8e5f43200259ce3bfd1129b653789664c175342fb3fcb9405a

SHA512
f72a331379d8d595843b4515d96286871e4cfdc3c866c1cc0a6779a1e6b0b127cd2eea2615ab78f754b1c0fb0c51ed33ee02975945539f532ce597e5f68a875e

Download Submit
memory/2536-24-0x000000001B5E0000-0x000000001B8C2000-memory.dmp

Filesize
2.9MB

Download
memory/2536-25-0x0000000002870000-0x0000000002878000-memory.dmp

Filesize
32KB

Download
memory/2684-19-0x000000013FC00000-0x000000013FC10000-memory.dmp

Filesize
64KB

Download
memory/2860-0-0x000007FEF56D3000-0x000007FEF56D4000-memory.dmp

Filesize
4KB

Download
memory/2860-1-0x000000013FD60000-0x000000013FD70000-memory.dmp

Filesize
64KB

Download
memory/2860-2-0x000007FEF56D0000-0x000007FEF60BC000-memory.dmp

Filesize
9.9MB

Download
memory/2860-3-0x000007FEF56D3000-0x000007FEF56D4000-memory.dmp

Filesize
4KB

Download
memory/2860-4-0x000007FEF56D0000-0x000007FEF60BC000-memory.dmp

Filesize
9.9MB

Download
memory/2860-14-0x000007FEF56D0000-0x000007FEF60BC000-memory.dmp

Filesize
9.9MB

Download