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
2612	attrib.exe
2692	attrib.exe

Executes dropped EXE 1 IoCs

pid	Process
356	$77Windows Security Notification.exe

Loads dropped DLL 1 IoCs

pid	Process
1700	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\\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
4	discord.com
5	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
1696	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
2940	schtasks.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2532	SilverClient.exe
2532	SilverClient.exe
2532	SilverClient.exe
356	$77Windows Security Notification.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeBackupPrivilege	2508	vssvc.exe
Token: SeRestorePrivilege	2508	vssvc.exe
Token: SeAuditPrivilege	2508	vssvc.exe
Token: SeDebugPrivilege	2532	SilverClient.exe
Token: SeDebugPrivilege	356	$77Windows Security Notification.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
356	$77Windows Security Notification.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 2532 wrote to memory of 2612	2532	SilverClient.exe	34
PID 2532 wrote to memory of 2612	2532	SilverClient.exe	34
PID 2532 wrote to memory of 2612	2532	SilverClient.exe	34
PID 2532 wrote to memory of 2692	2532	SilverClient.exe	36
PID 2532 wrote to memory of 2692	2532	SilverClient.exe	36
PID 2532 wrote to memory of 2692	2532	SilverClient.exe	36
PID 2532 wrote to memory of 1700	2532	SilverClient.exe	39
PID 2532 wrote to memory of 1700	2532	SilverClient.exe	39
PID 2532 wrote to memory of 1700	2532	SilverClient.exe	39
PID 1700 wrote to memory of 1696	1700	cmd.exe	41
PID 1700 wrote to memory of 1696	1700	cmd.exe	41
PID 1700 wrote to memory of 1696	1700	cmd.exe	41
PID 1700 wrote to memory of 356	1700	cmd.exe	42
PID 1700 wrote to memory of 356	1700	cmd.exe	42
PID 1700 wrote to memory of 356	1700	cmd.exe	42
PID 356 wrote to memory of 3068	356	$77Windows Security Notification.exe	44
PID 356 wrote to memory of 3068	356	$77Windows Security Notification.exe	44
PID 356 wrote to memory of 3068	356	$77Windows Security Notification.exe	44
PID 356 wrote to memory of 2940	356	$77Windows Security Notification.exe	46
PID 356 wrote to memory of 2940	356	$77Windows Security Notification.exe	46
PID 356 wrote to memory of 2940	356	$77Windows Security Notification.exe	46
PID 356 wrote to memory of 2288	356	$77Windows Security Notification.exe	48
PID 356 wrote to memory of 2288	356	$77Windows Security Notification.exe	48
PID 356 wrote to memory of 2288	356	$77Windows Security Notification.exe	48

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
2612	attrib.exe
2692	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:2532
- 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:2612
- 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:2692
- C:\Windows\system32\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmp10B3.tmp.bat""
  2⤵
  - Loads dropped DLL
  - Suspicious use of WriteProcessMemory
  PID:1700
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:1696
- - 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:356
  - - C:\Windows\system32\schtasks.exe
      "schtasks.exe" /query /TN $77Windows Security Notification.exe
      4⤵
      PID:3068
  - - 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:2940
  - - C:\Windows\system32\schtasks.exe
      "schtasks.exe" /query /TN $77Windows Security Notification.exe
      4⤵
      PID:2288

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2508

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

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Web Service

1

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmp10B3.tmp.bat

Filesize
190B

MD5
bfffe1cd249c5afe939b4952ae456cbd

SHA1
860f99959acbb1b2bb7568651c40397b7c27f8f2

SHA256
20a619b79b73bcd890b8c73bf4471590a95e82674108cbcf486c1dae1673047b

SHA512
d2643e5bddd77a0a92e6cc39fa7a14eb853e5c9e3d4a5c3e643b8d7f3e7ff3faa49a1da5c671e7f274005628e09110da4e3c9cab59ac410f8d75344a01b42387

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

Filesize
45KB

MD5
2644823b5c82b9597da0ec6fa4346443

SHA1
90209dcf6ba5f0d93b6dedee1a9431fc4e84bb00

SHA256
794580ebf0b57442304d0ce36a2ba9e3773fa366cd5b58a3033e0a403c5f7af8

SHA512
71ca346e329c69fca5c957f75497f0c0512120a85cabce663480f60a57e278b8510715b0ee05e471e411ca929b0952f009b99fbe49d597b345e1d2bc0eca9d73

Download Submit
memory/356-19-0x000000013F580000-0x000000013F590000-memory.dmp

Filesize
64KB

Download
memory/2532-0-0x000007FEF5823000-0x000007FEF5824000-memory.dmp

Filesize
4KB

Download
memory/2532-1-0x000000013FAC0000-0x000000013FAD0000-memory.dmp

Filesize
64KB

Download
memory/2532-2-0x000007FEF5820000-0x000007FEF620C000-memory.dmp

Filesize
9.9MB

Download
memory/2532-3-0x000007FEF5823000-0x000007FEF5824000-memory.dmp

Filesize
4KB

Download
memory/2532-4-0x000007FEF5820000-0x000007FEF620C000-memory.dmp

Filesize
9.9MB

Download
memory/2532-14-0x000007FEF5820000-0x000007FEF620C000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads