silverrat | 1ade996dd1fc081601f3ab8befa1307f908499e4bde9968f12ab39dc85ad74ad

General

Target

SilverClient.exe
Size

44KB
MD5

73da3b5354e231ee5b518758a190ced6
SHA1

a1d5ce5fa7721870a7500eb40337fc56cf72d7e2
SHA256

1ade996dd1fc081601f3ab8befa1307f908499e4bde9968f12ab39dc85ad74ad
SHA512

069a553b74b36251e860b2992ef5688418e022f173fbece7778e14066f4eee030669ecf6b5c1ea96225ec768da0b729306fc51d711dfd30fdf91450a8e1c97f4
SSDEEP

768:JX8w9gjLHx+6AHOTVR/Z5WIRULQeq9hLiuB6SyDADv+/nU:JMw4tAar/Z5zGsr9loJAD2/nU

Score

10^/10

silverrat evasion persistence trojan

Malware Config

Extracted

Family

silverrat

Version

1.0.0.0

C2

FBIInvestigation-41427.portmap.host:41427

Mutex

xhhCQtIByF

Attributes

certificate
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
decrypted_key
-|S.S.S|-
discord
https://discord.com/api/webhooks/1307565058028736522/BvuPOnvMCGBluGhgPBunWxSW6sccMPE50iCM97Bct0vExaNkF3__xy6dkdmzHQG2t597
key
yy6zDjAUmbB09pKvo5Hhug==
key_x509
RFNmZ1JPaXBaQXBxS05BdUdsQWNWU0VHREZSbmRK
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
2676	attrib.exe
2788	attrib.exe

Executes dropped EXE 1 IoCs

pid	Process
2280	$77Windows Security Notification.exe

Loads dropped DLL 1 IoCs

pid	Process
2596	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
2260	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
1928	schtasks.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2132	SilverClient.exe
2132	SilverClient.exe
2132	SilverClient.exe
2280	$77Windows Security Notification.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeBackupPrivilege	784	vssvc.exe
Token: SeRestorePrivilege	784	vssvc.exe
Token: SeAuditPrivilege	784	vssvc.exe
Token: SeDebugPrivilege	2132	SilverClient.exe
Token: SeDebugPrivilege	2280	$77Windows Security Notification.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2280	$77Windows Security Notification.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 2132 wrote to memory of 2676	2132	SilverClient.exe	34
PID 2132 wrote to memory of 2676	2132	SilverClient.exe	34
PID 2132 wrote to memory of 2676	2132	SilverClient.exe	34
PID 2132 wrote to memory of 2788	2132	SilverClient.exe	36
PID 2132 wrote to memory of 2788	2132	SilverClient.exe	36
PID 2132 wrote to memory of 2788	2132	SilverClient.exe	36
PID 2132 wrote to memory of 2596	2132	SilverClient.exe	38
PID 2132 wrote to memory of 2596	2132	SilverClient.exe	38
PID 2132 wrote to memory of 2596	2132	SilverClient.exe	38
PID 2596 wrote to memory of 2260	2596	cmd.exe	40
PID 2596 wrote to memory of 2260	2596	cmd.exe	40
PID 2596 wrote to memory of 2260	2596	cmd.exe	40
PID 2596 wrote to memory of 2280	2596	cmd.exe	41
PID 2596 wrote to memory of 2280	2596	cmd.exe	41
PID 2596 wrote to memory of 2280	2596	cmd.exe	41
PID 2280 wrote to memory of 1184	2280	$77Windows Security Notification.exe	43
PID 2280 wrote to memory of 1184	2280	$77Windows Security Notification.exe	43
PID 2280 wrote to memory of 1184	2280	$77Windows Security Notification.exe	43
PID 2280 wrote to memory of 1928	2280	$77Windows Security Notification.exe	45
PID 2280 wrote to memory of 1928	2280	$77Windows Security Notification.exe	45
PID 2280 wrote to memory of 1928	2280	$77Windows Security Notification.exe	45
PID 2280 wrote to memory of 2624	2280	$77Windows Security Notification.exe	47
PID 2280 wrote to memory of 2624	2280	$77Windows Security Notification.exe	47
PID 2280 wrote to memory of 2624	2280	$77Windows Security Notification.exe	47

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
2676	attrib.exe
2788	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:2132
- 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:2676
- 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:2788
- C:\Windows\system32\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmp7407.tmp.bat""
  2⤵
  - Loads dropped DLL
  - Suspicious use of WriteProcessMemory
  PID:2596
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:2260
- - 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:2280
  - - C:\Windows\system32\schtasks.exe
      "schtasks.exe" /query /TN $77Windows Security Notification.exe
      4⤵
      PID:1184
  - - 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:1928
  - - C:\Windows\system32\schtasks.exe
      "schtasks.exe" /query /TN $77Windows Security Notification.exe
      4⤵
      PID:2624

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:784

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\tmp7407.tmp.bat

Filesize
190B

MD5
e6666e9d534968f41755a9aea8e3f96e

SHA1
f90bc662624a8472d9e16341f7b3c92104d9e30b

SHA256
6ebf2c87b4d3087ec169790d753178be81d63073d1b3edc7b200a61246c58955

SHA512
9eb23f7d37b05590519111aa3050b8ddf8ed1b14979c5be68b399444552dbea1fceccb1bfe22f8343bb37113d9a914ebda443d33a053cc792bc657bedd017725

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

Filesize
44KB

MD5
73da3b5354e231ee5b518758a190ced6

SHA1
a1d5ce5fa7721870a7500eb40337fc56cf72d7e2

SHA256
1ade996dd1fc081601f3ab8befa1307f908499e4bde9968f12ab39dc85ad74ad

SHA512
069a553b74b36251e860b2992ef5688418e022f173fbece7778e14066f4eee030669ecf6b5c1ea96225ec768da0b729306fc51d711dfd30fdf91450a8e1c97f4

Download Submit
memory/2132-0-0x000007FEF6103000-0x000007FEF6104000-memory.dmp

Filesize
4KB

Download
memory/2132-1-0x000000013F7D0000-0x000000013F7E0000-memory.dmp

Filesize
64KB

Download
memory/2132-2-0x000007FEF6100000-0x000007FEF6AEC000-memory.dmp

Filesize
9.9MB

Download
memory/2132-3-0x000007FEF6100000-0x000007FEF6AEC000-memory.dmp

Filesize
9.9MB

Download
memory/2132-13-0x000007FEF6100000-0x000007FEF6AEC000-memory.dmp

Filesize
9.9MB

Download
memory/2280-18-0x000000013F2D0000-0x000000013F2E0000-memory.dmp

Filesize
64KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads