silverrat | fd198cf3ef764ffa17e7bd465d666057804a25ed5c6061074c0de7b6df43a667

Analysis

max time kernel
131s
max time network
153s
platform
windows10-2004_x64
resource
win10v2004-20250313-en
resource tags

arch:x64arch:x86image:win10v2004-20250313-enlocale:en-usos:windows10-2004-x64system
submitted
22/03/2025, 06:09

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General

Target

2f208058419a16ca3fa3574867071b4a.exe
Size

43KB
MD5

2f208058419a16ca3fa3574867071b4a
SHA1

ebaf2a437720c0d5915fee4f2943d35ff70d7258
SHA256

572b99caeb57f1999a3c7ec8ebea458cbde138bec44ed5531b8877249a1f594f
SHA512

e1c720cc30303303d7d850e5d72fce2d8e1274739b46516e684ea2761446fe090b35e58c4aa1e7405c1908e0dc614767cec3b749b262e5dde6370dfc02427967
SSDEEP

768:aR8c2Sev8VX/Ol6IoZmLPHBm7p4A6+HWbxk5XORULQI9PNGUz1QB6Sj/lo:aR8c2SeMwt5Jml5bWOOGsI94I1Qo4/lo

Score

10^/10

silverrat defense_evasion execution persistence trojan

Malware Config

Extracted

Family

silverrat

Version

1.0.0.0

american-designed.gl.at.ply.gg:50767

Mutex

lAxDBRhAFu

Attributes

certificate
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
decrypted_key
-|S.S.S|-
key
yy6zDjAUmbB09pKvo5Hhug==
key_x509
b0FGeVZNcFRMWVloVHR6Z0VESU5RdlpZUmxZbUFE
reconnect_delay
1
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.

defense_evasion

Hidden Files and Directories

T1564.001

pid	Process
5676	attrib.exe
4872	attrib.exe

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-3446877943-4095308722-756223633-1000\Control Panel\International\Geo\Nation	2f208058419a16ca3fa3574867071b4a.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3446877943-4095308722-756223633-1000\Control Panel\International\Geo\Nation	$77syshostreq.exe

Executes dropped EXE 1 IoCs

pid	Process
2720	$77syshostreq.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\\syshoster\\$77syshostreq.exe\""	2f208058419a16ca3fa3574867071b4a.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
3964	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

defense_evasion

pid	Process
536	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
884	schtasks.exe
4680	schtasks.exe

Suspicious behavior: EnumeratesProcesses 28 IoCs

pid	Process
5912	2f208058419a16ca3fa3574867071b4a.exe
5912	2f208058419a16ca3fa3574867071b4a.exe
5912	2f208058419a16ca3fa3574867071b4a.exe
5912	2f208058419a16ca3fa3574867071b4a.exe
5912	2f208058419a16ca3fa3574867071b4a.exe
5912	2f208058419a16ca3fa3574867071b4a.exe
5912	2f208058419a16ca3fa3574867071b4a.exe
5912	2f208058419a16ca3fa3574867071b4a.exe
5912	2f208058419a16ca3fa3574867071b4a.exe
5912	2f208058419a16ca3fa3574867071b4a.exe
5912	2f208058419a16ca3fa3574867071b4a.exe
5912	2f208058419a16ca3fa3574867071b4a.exe
5912	2f208058419a16ca3fa3574867071b4a.exe
5912	2f208058419a16ca3fa3574867071b4a.exe
5912	2f208058419a16ca3fa3574867071b4a.exe
5912	2f208058419a16ca3fa3574867071b4a.exe
5912	2f208058419a16ca3fa3574867071b4a.exe
5912	2f208058419a16ca3fa3574867071b4a.exe
5912	2f208058419a16ca3fa3574867071b4a.exe
5912	2f208058419a16ca3fa3574867071b4a.exe
5912	2f208058419a16ca3fa3574867071b4a.exe
5912	2f208058419a16ca3fa3574867071b4a.exe
5912	2f208058419a16ca3fa3574867071b4a.exe
2720	$77syshostreq.exe
2720	$77syshostreq.exe
3964	powershell.exe
3964	powershell.exe
3964	powershell.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeBackupPrivilege	5156	vssvc.exe
Token: SeRestorePrivilege	5156	vssvc.exe
Token: SeAuditPrivilege	5156	vssvc.exe
Token: SeDebugPrivilege	5912	2f208058419a16ca3fa3574867071b4a.exe
Token: SeDebugPrivilege	2720	$77syshostreq.exe
Token: SeDebugPrivilege	3964	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2720	$77syshostreq.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 5912 wrote to memory of 5676	5912	2f208058419a16ca3fa3574867071b4a.exe	90
PID 5912 wrote to memory of 5676	5912	2f208058419a16ca3fa3574867071b4a.exe	90
PID 5912 wrote to memory of 4872	5912	2f208058419a16ca3fa3574867071b4a.exe	92
PID 5912 wrote to memory of 4872	5912	2f208058419a16ca3fa3574867071b4a.exe	92
PID 5912 wrote to memory of 3248	5912	2f208058419a16ca3fa3574867071b4a.exe	99
PID 5912 wrote to memory of 3248	5912	2f208058419a16ca3fa3574867071b4a.exe	99
PID 3248 wrote to memory of 536	3248	cmd.exe	101
PID 3248 wrote to memory of 536	3248	cmd.exe	101
PID 3248 wrote to memory of 2720	3248	cmd.exe	103
PID 3248 wrote to memory of 2720	3248	cmd.exe	103
PID 2720 wrote to memory of 1224	2720	$77syshostreq.exe	105
PID 2720 wrote to memory of 1224	2720	$77syshostreq.exe	105
PID 2720 wrote to memory of 884	2720	$77syshostreq.exe	107
PID 2720 wrote to memory of 884	2720	$77syshostreq.exe	107
PID 2720 wrote to memory of 5732	2720	$77syshostreq.exe	109
PID 2720 wrote to memory of 5732	2720	$77syshostreq.exe	109
PID 2720 wrote to memory of 3964	2720	$77syshostreq.exe	111
PID 2720 wrote to memory of 3964	2720	$77syshostreq.exe	111
PID 2720 wrote to memory of 4680	2720	$77syshostreq.exe	112
PID 2720 wrote to memory of 4680	2720	$77syshostreq.exe	112

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
Uses Volume Shadow Copy service COM API
The Volume Shadow Copy service is used to manage backups/snapshots.
ransomware

Views/modifies file attributes 1 TTPs 2 IoCs

defense_evasion

Hidden Files and Directories

T1564.001

pid	Process
5676	attrib.exe
4872	attrib.exe

C:\Users\Admin\AppData\Local\Temp\2f208058419a16ca3fa3574867071b4a.exe
"C:\Users\Admin\AppData\Local\Temp\2f208058419a16ca3fa3574867071b4a.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5912
- C:\Windows\System32\attrib.exe
  "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\syshoster"
  2⤵
  - Sets file to hidden
  - Views/modifies file attributes
  PID:5676
- C:\Windows\System32\attrib.exe
  "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\syshoster\$77syshostreq.exe"
  2⤵
  - Sets file to hidden
  - Views/modifies file attributes
  PID:4872
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpB6DC.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3248
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:536
- - C:\Users\Admin\syshoster\$77syshostreq.exe
    "C:\Users\Admin\syshoster\$77syshostreq.exe"
    3⤵
    - Checks computer location settings
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:2720
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks.exe" /query /TN $77syshostreq.exe
      4⤵
      PID:1224
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks.exe" /Create /SC ONCE /TN "$77syshostreq.exe" /TR "C:\Users\Admin\syshoster\$77syshostreq.exe \"\$77syshostreq.exe\" /AsAdmin" /ST 00:01 /IT /F /RL HIGHEST
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:884
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks.exe" /query /TN $77syshostreq.exe
      4⤵
      PID:5732
  - - 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:3964
  - - C:\Windows\System32\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /create /sc hourly /mo 1 /tn "syshostreq_Task-HOURLY-01" /tr "%MyFile%" /st 00:00
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:4680

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:5156

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\__PSScriptPolicyTest_ihn0nvus.2lq.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpB6DC.tmp.bat

Filesize
151B

MD5
52502ff8ef156953a07d1925f414bce1

SHA1
ee340c81a3aa2513d08200c91e58c0ce38cef9e1

SHA256
1d87f321c2fe1b5f6e28de7c9123f887374e78ab623e8012b73072dbe002f88f

SHA512
338affc33138e614ef8fb0ee90f7e37f4741588088ffd5ab137c4a816fdd1cbb17c01c62af3de82e0a192561ae1290c4318f64314232edad3b21016ffd72d9b2

Download Submit
C:\Users\Admin\syshoster\$77syshostreq.exe

Filesize
43KB

MD5
2f208058419a16ca3fa3574867071b4a

SHA1
ebaf2a437720c0d5915fee4f2943d35ff70d7258

SHA256
572b99caeb57f1999a3c7ec8ebea458cbde138bec44ed5531b8877249a1f594f

SHA512
e1c720cc30303303d7d850e5d72fce2d8e1274739b46516e684ea2761446fe090b35e58c4aa1e7405c1908e0dc614767cec3b749b262e5dde6370dfc02427967

Download Submit
memory/3964-14-0x000002BDF4900000-0x000002BDF4922000-memory.dmp

Filesize
136KB

Download
memory/5912-0-0x00007FFA57C03000-0x00007FFA57C05000-memory.dmp

Filesize
8KB

Download
memory/5912-1-0x0000000000050000-0x0000000000060000-memory.dmp

Filesize
64KB

Download
memory/5912-2-0x00007FFA57C00000-0x00007FFA586C1000-memory.dmp

Filesize
10.8MB

Download
memory/5912-3-0x00007FFA57C03000-0x00007FFA57C05000-memory.dmp

Filesize
8KB

Download
memory/5912-4-0x00007FFA57C00000-0x00007FFA586C1000-memory.dmp

Filesize
10.8MB

Download
memory/5912-10-0x00007FFA57C00000-0x00007FFA586C1000-memory.dmp

Filesize
10.8MB

Download