silverrat | 907fb92997b972e78332b4af673b2edb952958a20e69c3dfd640bee178a69a92

General

Target

SilverClient.exe
Size

45KB
MD5

a77fe640a52e867b8671afa339e3e2a5
SHA1

8fa5fec7497fd61d411dfb203fc64f4982c57ac9
SHA256

907fb92997b972e78332b4af673b2edb952958a20e69c3dfd640bee178a69a92
SHA512

7e7f56b5f79851eb24251e2ac305b9206b1cc4bd3e7fe3b945b82fc8d586d5952112165fb4d85166f4201c7d078a31be63442ae03c3fe55e8ecd2fd608fd91af
SSDEEP

768:aOS6iAM9YjbKBXwFl89UIUnMhRULQD9Paacz1QB6SAYEGvR/0U:aOS6iAMNaFbIUngGsD9k1QojYEG5/0U

Score

10^/10

silverrat evasion execution persistence trojan

Malware Config

Extracted

Family

silverrat

Version

1.0.0.0

C2

fitness-plastics.gl.at.ply.gg:65141

Mutex

lAxDBRhAFu

Attributes

certificate
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
decrypted_key
-|S.S.S|-
discord
https://discord.com/api/webhooks/1290041260278681610/ASnXqqYAGsyjqbcvbj10VUjU3uPX5Um0gbAdG_DhAbyyLcJZhRDgR-ox4JuYMLDQLn5Y
key
yy6zDjAUmbB09pKvo5Hhug==
key_x509
b0FGeVZNcFRMWVloVHR6Z0VESU5RdlpZUmxZbUFE
payload_url
https://g.top4top.io/p_2522c7w8u1.png
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.

evasion

Hidden Files and Directories

T1564.001

pid	Process
4624	attrib.exe
528	attrib.exe

Executes dropped EXE 1 IoCs

pid	Process
3432	$77swnchostplus.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\\SustemRecaveryswn\\$77swnchostplus.exe\""	SilverClient.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
2148	powershell.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service

T1102

flow	ioc
2	discord.com
4	discord.com

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
304	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
2424	schtasks.exe
3128	schtasks.exe

Suspicious behavior: EnumeratesProcesses 19 IoCs

pid	Process
1468	SilverClient.exe
1468	SilverClient.exe
1468	SilverClient.exe
1468	SilverClient.exe
1468	SilverClient.exe
1468	SilverClient.exe
1468	SilverClient.exe
1468	SilverClient.exe
1468	SilverClient.exe
1468	SilverClient.exe
1468	SilverClient.exe
1468	SilverClient.exe
1468	SilverClient.exe
1468	SilverClient.exe
1468	SilverClient.exe
2148	powershell.exe
2148	powershell.exe
2148	powershell.exe
3432	$77swnchostplus.exe

Suspicious use of AdjustPrivilegeToken 27 IoCs

description	pid	Process
Token: SeBackupPrivilege	4436	vssvc.exe
Token: SeRestorePrivilege	4436	vssvc.exe
Token: SeAuditPrivilege	4436	vssvc.exe
Token: SeDebugPrivilege	1468	SilverClient.exe
Token: SeDebugPrivilege	3432	$77swnchostplus.exe
Token: SeDebugPrivilege	2148	powershell.exe
Token: SeIncreaseQuotaPrivilege	2148	powershell.exe
Token: SeSecurityPrivilege	2148	powershell.exe
Token: SeTakeOwnershipPrivilege	2148	powershell.exe
Token: SeLoadDriverPrivilege	2148	powershell.exe
Token: SeSystemProfilePrivilege	2148	powershell.exe
Token: SeSystemtimePrivilege	2148	powershell.exe
Token: SeProfSingleProcessPrivilege	2148	powershell.exe
Token: SeIncBasePriorityPrivilege	2148	powershell.exe
Token: SeCreatePagefilePrivilege	2148	powershell.exe
Token: SeBackupPrivilege	2148	powershell.exe
Token: SeRestorePrivilege	2148	powershell.exe
Token: SeShutdownPrivilege	2148	powershell.exe
Token: SeDebugPrivilege	2148	powershell.exe
Token: SeSystemEnvironmentPrivilege	2148	powershell.exe
Token: SeRemoteShutdownPrivilege	2148	powershell.exe
Token: SeUndockPrivilege	2148	powershell.exe
Token: SeManageVolumePrivilege	2148	powershell.exe
Token: 33	2148	powershell.exe
Token: 34	2148	powershell.exe
Token: 35	2148	powershell.exe
Token: 36	2148	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3432	$77swnchostplus.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 1468 wrote to memory of 4624	1468	SilverClient.exe	77
PID 1468 wrote to memory of 4624	1468	SilverClient.exe	77
PID 1468 wrote to memory of 528	1468	SilverClient.exe	79
PID 1468 wrote to memory of 528	1468	SilverClient.exe	79
PID 1468 wrote to memory of 4220	1468	SilverClient.exe	81
PID 1468 wrote to memory of 4220	1468	SilverClient.exe	81
PID 4220 wrote to memory of 304	4220	cmd.exe	83
PID 4220 wrote to memory of 304	4220	cmd.exe	83
PID 4220 wrote to memory of 3432	4220	cmd.exe	84
PID 4220 wrote to memory of 3432	4220	cmd.exe	84
PID 3432 wrote to memory of 3652	3432	$77swnchostplus.exe	86
PID 3432 wrote to memory of 3652	3432	$77swnchostplus.exe	86
PID 3432 wrote to memory of 2424	3432	$77swnchostplus.exe	88
PID 3432 wrote to memory of 2424	3432	$77swnchostplus.exe	88
PID 3432 wrote to memory of 3576	3432	$77swnchostplus.exe	90
PID 3432 wrote to memory of 3576	3432	$77swnchostplus.exe	90
PID 3432 wrote to memory of 2148	3432	$77swnchostplus.exe	92
PID 3432 wrote to memory of 2148	3432	$77swnchostplus.exe	92
PID 3432 wrote to memory of 3128	3432	$77swnchostplus.exe	94
PID 3432 wrote to memory of 3128	3432	$77swnchostplus.exe	94

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

evasion

Hidden Files and Directories

T1564.001

pid	Process
4624	attrib.exe
528	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:1468
- C:\Windows\System32\attrib.exe
  "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\SustemRecaveryswn"
  2⤵
  - Sets file to hidden
  - Views/modifies file attributes
  PID:4624
- C:\Windows\System32\attrib.exe
  "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\SustemRecaveryswn\$77swnchostplus.exe"
  2⤵
  - Sets file to hidden
  - Views/modifies file attributes
  PID:528
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpD32E.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4220
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:304
- - C:\Users\Admin\SustemRecaveryswn\$77swnchostplus.exe
    "C:\Users\Admin\SustemRecaveryswn\$77swnchostplus.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:3432
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks.exe" /query /TN $77swnchostplus.exe
      4⤵
      PID:3652
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks.exe" /Create /SC ONCE /TN "$77swnchostplus.exe" /TR "C:\Users\Admin\SustemRecaveryswn\$77swnchostplus.exe \"\$77swnchostplus.exe\" /AsAdmin" /ST 00:01 /IT /F /RL HIGHEST
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:2424
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks.exe" /query /TN $77swnchostplus.exe
      4⤵
      PID:3576
  - - 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:2148
  - - C:\Windows\System32\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /create /sc hourly /mo 1 /tn "swnchostplus_Task-HOURLY-01" /tr "%MyFile%" /st 00:00
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:3128

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:4436

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Hide Artifacts

2

T1564

Hidden Files and Directories

Modify Registry

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Web Service

1

T1102

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_5y0eatml.ofc.ps1

Filesize
1B

MD5
c4ca4238a0b923820dcc509a6f75849b

SHA1
356a192b7913b04c54574d18c28d46e6395428ab

SHA256
6b86b273ff34fce19d6b804eff5a3f5747ada4eaa22f1d49c01e52ddb7875b4b

SHA512
4dff4ea340f0a823f15d3f4f01ab62eae0e5da579ccb851f8db9dfe84c58b2b37b89903a740e1ee172da793a6e79d560e5f7f9bd058a12a280433ed6fa46510a

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpD32E.tmp.bat

Filesize
161B

MD5
2c26357507a859b37c84355f64266170

SHA1
1bee11e0972a74017c829e09ba15fe2f420bf7ca

SHA256
6e509da7b67034cfee71eefbe8fa9a71c27e57bf8301c396386c544c031eefbc

SHA512
8c7dfd6915cd600ac03806b98b0bf05d83412cb3a0c380c590de7ae397e3e2f4bd4f4c5672e360f9ed8a3ed27802a6ad6a839a1eb91fbb06d78ec4c8ba367b93

Download Submit
C:\Users\Admin\SustemRecaveryswn\$77swnchostplus.exe

Filesize
45KB

MD5
a77fe640a52e867b8671afa339e3e2a5

SHA1
8fa5fec7497fd61d411dfb203fc64f4982c57ac9

SHA256
907fb92997b972e78332b4af673b2edb952958a20e69c3dfd640bee178a69a92

SHA512
7e7f56b5f79851eb24251e2ac305b9206b1cc4bd3e7fe3b945b82fc8d586d5952112165fb4d85166f4201c7d078a31be63442ae03c3fe55e8ecd2fd608fd91af

Download Submit
memory/1468-0-0x0000000000FE0000-0x0000000000FF0000-memory.dmp

Filesize
64KB

Download
memory/1468-1-0x00007FFA60383000-0x00007FFA60384000-memory.dmp

Filesize
4KB

Download
memory/1468-2-0x00007FFA60380000-0x00007FFA60D6C000-memory.dmp

Filesize
9.9MB

Download
memory/1468-3-0x00007FFA60383000-0x00007FFA60384000-memory.dmp

Filesize
4KB

Download
memory/1468-4-0x00007FFA60380000-0x00007FFA60D6C000-memory.dmp

Filesize
9.9MB

Download
memory/1468-10-0x00007FFA60380000-0x00007FFA60D6C000-memory.dmp

Filesize
9.9MB

Download
memory/2148-18-0x000001E0E8740000-0x000001E0E8762000-memory.dmp

Filesize
136KB

Download
memory/2148-21-0x000001E0E88F0000-0x000001E0E8966000-memory.dmp

Filesize
472KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads