silverrat | 794580ebf0b57442304d0ce36a2ba9e3773fa366cd5b58a3033e0a403c5f7af8

General

Target

SilverClient.exe
Size

45KB
MD5

2644823b5c82b9597da0ec6fa4346443
SHA1

90209dcf6ba5f0d93b6dedee1a9431fc4e84bb00
SHA256

794580ebf0b57442304d0ce36a2ba9e3773fa366cd5b58a3033e0a403c5f7af8
SHA512

71ca346e329c69fca5c957f75497f0c0512120a85cabce663480f60a57e278b8510715b0ee05e471e411ca929b0952f009b99fbe49d597b345e1d2bc0eca9d73
SSDEEP

768:cNIuPbqQXqoivOLl1NiIReRULQez9hsB1TB6SXaAdvre/CE:czPA2PkIReGsu9ATonAdi/CE

Score

10^/10

silverrat evasion persistence trojan

Malware Config

Extracted

Family

silverrat

Version

1.0.0.0

C2

FBIInvestigation-61203.portmap.host:61203

Mutex

SAHJDBJDKS

Attributes

certificate
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
decrypted_key
-|S.S.S|-
discord
https://discord.com/api/webhooks/1307565058028736522/BvuPOnvMCGBluGhgPBunWxSW6sccMPE50iCM97Bct0vExaNkF3__xy6dkdmzHQG2t597
key
yy6zDjAUmbB09pKvo5Hhug==
key_x509
ZkRpZ1NFYnRETFdPd1ZPV2NZT0JxZXRkQUFEUFFw
payload_url
https://g.top4top.io/p_2522c7w8u1.png
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
1172	attrib.exe
1380	attrib.exe

Checks computer location settings 2 TTPs 1 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-1-5-21-4050598569-1597076380-177084960-1000\Control Panel\International\Geo\Nation	SilverClient.exe

Executes dropped EXE 1 IoCs

pid	Process
2592	$77Windows Security Notification.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\\Windows Security Notification\\$77Windows Security Notification.exe\""	SilverClient.exe

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

Web Service

T1102

flow	ioc
20	discord.com
21	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
3004	timeout.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
3728	schtasks.exe

Suspicious behavior: EnumeratesProcesses 27 IoCs

pid	Process
3140	SilverClient.exe
3140	SilverClient.exe
3140	SilverClient.exe
3140	SilverClient.exe
3140	SilverClient.exe
3140	SilverClient.exe
3140	SilverClient.exe
3140	SilverClient.exe
3140	SilverClient.exe
3140	SilverClient.exe
3140	SilverClient.exe
3140	SilverClient.exe
3140	SilverClient.exe
3140	SilverClient.exe
3140	SilverClient.exe
3140	SilverClient.exe
3140	SilverClient.exe
3140	SilverClient.exe
3140	SilverClient.exe
3140	SilverClient.exe
3140	SilverClient.exe
3140	SilverClient.exe
3140	SilverClient.exe
3140	SilverClient.exe
3140	SilverClient.exe
3140	SilverClient.exe
2592	$77Windows Security Notification.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeBackupPrivilege	2928	vssvc.exe
Token: SeRestorePrivilege	2928	vssvc.exe
Token: SeAuditPrivilege	2928	vssvc.exe
Token: SeDebugPrivilege	3140	SilverClient.exe
Token: SeDebugPrivilege	2592	$77Windows Security Notification.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2592	$77Windows Security Notification.exe

Suspicious use of WriteProcessMemory 16 IoCs

description	pid	Process	procid_target
PID 3140 wrote to memory of 1172	3140	SilverClient.exe	86
PID 3140 wrote to memory of 1172	3140	SilverClient.exe	86
PID 3140 wrote to memory of 1380	3140	SilverClient.exe	88
PID 3140 wrote to memory of 1380	3140	SilverClient.exe	88
PID 3140 wrote to memory of 4844	3140	SilverClient.exe	96
PID 3140 wrote to memory of 4844	3140	SilverClient.exe	96
PID 4844 wrote to memory of 3004	4844	cmd.exe	98
PID 4844 wrote to memory of 3004	4844	cmd.exe	98
PID 4844 wrote to memory of 2592	4844	cmd.exe	99
PID 4844 wrote to memory of 2592	4844	cmd.exe	99
PID 2592 wrote to memory of 400	2592	$77Windows Security Notification.exe	101
PID 2592 wrote to memory of 400	2592	$77Windows Security Notification.exe	101
PID 2592 wrote to memory of 3728	2592	$77Windows Security Notification.exe	103
PID 2592 wrote to memory of 3728	2592	$77Windows Security Notification.exe	103
PID 2592 wrote to memory of 2700	2592	$77Windows Security Notification.exe	105
PID 2592 wrote to memory of 2700	2592	$77Windows Security Notification.exe	105

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
1172	attrib.exe
1380	attrib.exe

C:\Users\Admin\AppData\Local\Temp\SilverClient.exe
"C:\Users\Admin\AppData\Local\Temp\SilverClient.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3140
- C:\Windows\System32\attrib.exe
  "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\Windows Security Notification"
  2⤵
  - Sets file to hidden
  - Views/modifies file attributes
  PID:1172
- C:\Windows\System32\attrib.exe
  "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\Windows Security Notification\$77Windows Security Notification.exe"
  2⤵
  - Sets file to hidden
  - Views/modifies file attributes
  PID:1380
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpDA33.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4844
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:3004
- - C:\Users\Admin\Windows Security Notification\$77Windows Security Notification.exe
    "C:\Users\Admin\Windows Security Notification\$77Windows Security Notification.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:2592
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks.exe" /query /TN $77Windows Security Notification.exe
      4⤵
      PID:400
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks.exe" /Create /SC ONCE /TN "$77Windows Security Notification.exe" /TR "C:\Users\Admin\Windows Security Notification\$77Windows Security Notification.exe \"\$77Windows Security Notification.exe\" /AsAdmin" /ST 00:01 /IT /F /RL HIGHEST
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:3728
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks.exe" /query /TN $77Windows Security Notification.exe
      4⤵
      PID:2700

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2928

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

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

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Web Service

1

T1102

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Temp\tmpDA33.tmp.bat

Filesize
190B

MD5
1bd941ab4c7ead269e47da38bfbe4e78

SHA1
e336e5f88afc6195abceeb6bce036c19a1f4a364

SHA256
293a9b40b12d39599eebf97d2fc7af4d9803893062709c02f4e9693d12109222

SHA512
f32b9357e10407182a4bf9d9f02001ef80c3bf22d737a944f7a7c512d7d6ffb42b12b71f0f89c560b71bff1f73088df4000145314931a698209fbe95cc03e035

Download Submit
C:\Users\Admin\Windows Security Notification\$77Windows Security Notification.exe

Filesize
45KB

MD5
2644823b5c82b9597da0ec6fa4346443

SHA1
90209dcf6ba5f0d93b6dedee1a9431fc4e84bb00

SHA256
794580ebf0b57442304d0ce36a2ba9e3773fa366cd5b58a3033e0a403c5f7af8

SHA512
71ca346e329c69fca5c957f75497f0c0512120a85cabce663480f60a57e278b8510715b0ee05e471e411ca929b0952f009b99fbe49d597b345e1d2bc0eca9d73

Download Submit
memory/3140-1-0x00007FF96A283000-0x00007FF96A285000-memory.dmp

Filesize
8KB

Download
memory/3140-0-0x0000000000430000-0x0000000000440000-memory.dmp

Filesize
64KB

Download
memory/3140-2-0x00007FF96A280000-0x00007FF96AD41000-memory.dmp

Filesize
10.8MB

Download
memory/3140-3-0x00007FF96A280000-0x00007FF96AD41000-memory.dmp

Filesize
10.8MB

Download
memory/3140-9-0x00007FF96A280000-0x00007FF96AD41000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads