silverrat | 572b99caeb57f1999a3c7ec8ebea458cbde138bec44ed5531b8877249a1f594f

Analysis

max time kernel
131s
max time network
141s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
20/03/2025, 19:03

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General

Target

Astri.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
3056	attrib.exe
2688	attrib.exe

Executes dropped EXE 1 IoCs

pid	Process
2964	$77syshostreq.exe

Loads dropped DLL 1 IoCs

pid	Process
2044	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\\syshoster\\$77syshostreq.exe\""	Astri.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
2548	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
2916	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
2016	schtasks.exe
2168	schtasks.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
1836	Astri.exe
1836	Astri.exe
1836	Astri.exe
2964	$77syshostreq.exe
2548	powershell.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeBackupPrivilege	2808	vssvc.exe
Token: SeRestorePrivilege	2808	vssvc.exe
Token: SeAuditPrivilege	2808	vssvc.exe
Token: SeDebugPrivilege	1836	Astri.exe
Token: SeDebugPrivilege	2964	$77syshostreq.exe
Token: SeDebugPrivilege	2548	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2964	$77syshostreq.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 1836 wrote to memory of 3056	1836	Astri.exe	34
PID 1836 wrote to memory of 3056	1836	Astri.exe	34
PID 1836 wrote to memory of 3056	1836	Astri.exe	34
PID 1836 wrote to memory of 2688	1836	Astri.exe	36
PID 1836 wrote to memory of 2688	1836	Astri.exe	36
PID 1836 wrote to memory of 2688	1836	Astri.exe	36
PID 1836 wrote to memory of 2044	1836	Astri.exe	39
PID 1836 wrote to memory of 2044	1836	Astri.exe	39
PID 1836 wrote to memory of 2044	1836	Astri.exe	39
PID 2044 wrote to memory of 2916	2044	cmd.exe	41
PID 2044 wrote to memory of 2916	2044	cmd.exe	41
PID 2044 wrote to memory of 2916	2044	cmd.exe	41
PID 2044 wrote to memory of 2964	2044	cmd.exe	42
PID 2044 wrote to memory of 2964	2044	cmd.exe	42
PID 2044 wrote to memory of 2964	2044	cmd.exe	42
PID 2964 wrote to memory of 2124	2964	$77syshostreq.exe	44
PID 2964 wrote to memory of 2124	2964	$77syshostreq.exe	44
PID 2964 wrote to memory of 2124	2964	$77syshostreq.exe	44
PID 2964 wrote to memory of 2016	2964	$77syshostreq.exe	46
PID 2964 wrote to memory of 2016	2964	$77syshostreq.exe	46
PID 2964 wrote to memory of 2016	2964	$77syshostreq.exe	46
PID 2964 wrote to memory of 1804	2964	$77syshostreq.exe	48
PID 2964 wrote to memory of 1804	2964	$77syshostreq.exe	48
PID 2964 wrote to memory of 1804	2964	$77syshostreq.exe	48
PID 2964 wrote to memory of 2548	2964	$77syshostreq.exe	50
PID 2964 wrote to memory of 2548	2964	$77syshostreq.exe	50
PID 2964 wrote to memory of 2548	2964	$77syshostreq.exe	50
PID 2964 wrote to memory of 2168	2964	$77syshostreq.exe	52
PID 2964 wrote to memory of 2168	2964	$77syshostreq.exe	52
PID 2964 wrote to memory of 2168	2964	$77syshostreq.exe	52

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
3056	attrib.exe
2688	attrib.exe

C:\Users\Admin\AppData\Local\Temp\Astri.exe
"C:\Users\Admin\AppData\Local\Temp\Astri.exe"
1⤵
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1836
- 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:3056
- 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:2688
- C:\Windows\system32\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmp10D2.tmp.bat""
  2⤵
  - Loads dropped DLL
  - Suspicious use of WriteProcessMemory
  PID:2044
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:2916
- - C:\Users\Admin\syshoster\$77syshostreq.exe
    "C:\Users\Admin\syshoster\$77syshostreq.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:2964
  - - C:\Windows\system32\schtasks.exe
      "schtasks.exe" /query /TN $77syshostreq.exe
      4⤵
      PID:2124
  - - 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:2016
  - - C:\Windows\system32\schtasks.exe
      "schtasks.exe" /query /TN $77syshostreq.exe
      4⤵
      PID:1804
  - - 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:2548
  - - 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:2168

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2808

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\tmp10D2.tmp.bat

Filesize
151B

MD5
a3f2c4aab56d245f21fc12a9c786e08d

SHA1
ea437b90c0d4648ed890a2861cc24cc48a2407d7

SHA256
acea95cc2574f8d3b33f604606b982a1519370d8803e962578cf5fc18a8de02a

SHA512
0be992b218edc8895bca10f0318fb679979de7673001be60272ad49d197b86883f4e5f75127f5db0944171c92025c4a280bcdde2393ea726f7e5298e20bcf59b

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

Filesize
43KB

MD5
2f208058419a16ca3fa3574867071b4a

SHA1
ebaf2a437720c0d5915fee4f2943d35ff70d7258

SHA256
572b99caeb57f1999a3c7ec8ebea458cbde138bec44ed5531b8877249a1f594f

SHA512
e1c720cc30303303d7d850e5d72fce2d8e1274739b46516e684ea2761446fe090b35e58c4aa1e7405c1908e0dc614767cec3b749b262e5dde6370dfc02427967

Download Submit
memory/1836-0-0x000007FEF5F83000-0x000007FEF5F84000-memory.dmp

Filesize
4KB

Download
memory/1836-1-0x000000013F750000-0x000000013F760000-memory.dmp

Filesize
64KB

Download
memory/1836-2-0x000007FEF5F80000-0x000007FEF696C000-memory.dmp

Filesize
9.9MB

Download
memory/1836-3-0x000007FEF5F83000-0x000007FEF5F84000-memory.dmp

Filesize
4KB

Download
memory/1836-4-0x000007FEF5F80000-0x000007FEF696C000-memory.dmp

Filesize
9.9MB

Download
memory/1836-14-0x000007FEF5F80000-0x000007FEF696C000-memory.dmp

Filesize
9.9MB

Download
memory/2548-24-0x000000001B700000-0x000000001B9E2000-memory.dmp

Filesize
2.9MB

Download
memory/2548-25-0x00000000021D0000-0x00000000021D8000-memory.dmp

Filesize
32KB

Download
memory/2964-19-0x000000013FFA0000-0x000000013FFB0000-memory.dmp

Filesize
64KB

Download