silverrat | 0aabdf641f3d52d11b464745e1b42b091efa0e5ba91738bb1c11700b612d97e5

General

Target

17A1W_loader.exe
Size

44KB
MD5

e4e58b0f1c15003574a494e4b48e3f9c
SHA1

fb63c0a2bf0f4b24e5b788196d98a358f754eb64
SHA256

0aabdf641f3d52d11b464745e1b42b091efa0e5ba91738bb1c11700b612d97e5
SHA512

cf27741f51a30f44e8d2abe9bbadeae20af85d0bae8da318e4af51635edd04448ada3c56d07f47a58df0e0da4585f5ff94ac43d26573d51df92b2008893c4744
SSDEEP

768:ZnKfS0ROTyd1HrTWAM20ZxM/x1ph4yAGnRUT/p9wInQh6B6SpWXvrbVBPU:Zk66/x1DqGnG19goosWXfVRU

Score

10^/10

silverrat evasion execution persistence trojan

Malware Config

Extracted

Family

silverrat

Version

1.0.0.0

C2

functions-transexual.gl.at.ply.gg:43180

Mutex

lAxDBRhAFu

Attributes

certificate
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
decrypted_key
-|S.S.S|-
discord
https://discord.com/api/webhooks/1303745149020667914/kQyaG_tFY62VZNt9yNbv3N84w4AomnzGkaN-Uuv7jh2gKVFiPdpQiJIOUV53IcNqbVzh
key
yy6zDjAUmbB09pKvo5Hhug==
key_x509
RURjWW9nVHFWREhZcnNESmpObEx1VnVPVEVDZ0Zu
payload_url
https://g.top4top.io/p_2522c7w8u1.png
reconnect_delay
4
server_signature
J2CE/6enhOYv/t93SNbQiaNffca0QC5m1IJTYKjgOfMnvMbA/og5hUlurELwpLoG6uTO14rU14F3tSSwQBhyjaDerPLXDav5EhsWtEincselSG9rwU7PLfAVL1gnCFB9rQdkro7gz0o2j1XULWmukjaatM5laO48aaT4nRAkOWCKyb1kGvcTHHUPiNKOL7kRIaQpRZbCjaOfNopWHyRNbkI1kRkUU3Gi7vWPU+ntF8Fb7xybSYI6xRXx5BtVOhDGKJ23sDbOFfmZltxD/V3Y8Z9OzWbzlmnTojHp/SJ4PNnEZmj3IH5quJ/L292AskRFv6Gd3uDxpE6zR3B+nRyNwOEyWeym4FrMeObQi5GjLX/Vno8fr8U6h3pVymf4VkA7QlzVKFHvEX3LISnvY39NUXzSsVie/Knk57x+FCcsJPUKxj51eX6KNazVl9dQ9k+Fwd3AXBQj3yg52Ip+YTTbAXh3uaoQRIUl9VMlW5CgxuqP8GjtsH4Dkf2Aa1k+zh2y/xDtxtnoZpXGYzzuQDRl/Q0/zCFWRxcwo9UP40qCvpyiKRI/7TZcTkzgH9PgJG5KJbqHaPXN1oEsk1vo9cpoDg3q3IOp5maOl3i4wMK1U0DkkoZP6lfBeSY4QWPXE9i9HXwilhIaE21pkcTEg3r7XPgCaM8UFjGY04ubXhWPc/A=

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
1056	attrib.exe
3056	attrib.exe

Executes dropped EXE 1 IoCs

pid	Process
2560	$77a.exe

Loads dropped DLL 1 IoCs

pid	Process
2988	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\\fgfgfg\\$77a.exe\""	17A1W_loader.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
1240	powershell.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
2848	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
2548	schtasks.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
2348	17A1W_loader.exe
2348	17A1W_loader.exe
2348	17A1W_loader.exe
1240	powershell.exe
2560	$77a.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	2348	17A1W_loader.exe
Token: SeDebugPrivilege	2560	$77a.exe
Token: SeDebugPrivilege	1240	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2560	$77a.exe

Suspicious use of WriteProcessMemory 27 IoCs

description	pid	Process	procid_target
PID 2348 wrote to memory of 1056	2348	17A1W_loader.exe	30
PID 2348 wrote to memory of 1056	2348	17A1W_loader.exe	30
PID 2348 wrote to memory of 1056	2348	17A1W_loader.exe	30
PID 2348 wrote to memory of 3056	2348	17A1W_loader.exe	32
PID 2348 wrote to memory of 3056	2348	17A1W_loader.exe	32
PID 2348 wrote to memory of 3056	2348	17A1W_loader.exe	32
PID 2348 wrote to memory of 2988	2348	17A1W_loader.exe	35
PID 2348 wrote to memory of 2988	2348	17A1W_loader.exe	35
PID 2348 wrote to memory of 2988	2348	17A1W_loader.exe	35
PID 2988 wrote to memory of 2848	2988	cmd.exe	37
PID 2988 wrote to memory of 2848	2988	cmd.exe	37
PID 2988 wrote to memory of 2848	2988	cmd.exe	37
PID 2988 wrote to memory of 2560	2988	cmd.exe	38
PID 2988 wrote to memory of 2560	2988	cmd.exe	38
PID 2988 wrote to memory of 2560	2988	cmd.exe	38
PID 2560 wrote to memory of 2588	2560	$77a.exe	39
PID 2560 wrote to memory of 2588	2560	$77a.exe	39
PID 2560 wrote to memory of 2588	2560	$77a.exe	39
PID 2560 wrote to memory of 2548	2560	$77a.exe	41
PID 2560 wrote to memory of 2548	2560	$77a.exe	41
PID 2560 wrote to memory of 2548	2560	$77a.exe	41
PID 2560 wrote to memory of 2608	2560	$77a.exe	43
PID 2560 wrote to memory of 2608	2560	$77a.exe	43
PID 2560 wrote to memory of 2608	2560	$77a.exe	43
PID 2560 wrote to memory of 1240	2560	$77a.exe	45
PID 2560 wrote to memory of 1240	2560	$77a.exe	45
PID 2560 wrote to memory of 1240	2560	$77a.exe	45

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

Views/modifies file attributes 1 TTPs 2 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
1056	attrib.exe
3056	attrib.exe

C:\Users\Admin\AppData\Local\Temp\17A1W_loader.exe
"C:\Users\Admin\AppData\Local\Temp\17A1W_loader.exe"
1⤵
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2348
- C:\Windows\System32\attrib.exe
  "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\fgfgfg"
  2⤵
  - Sets file to hidden
  - Views/modifies file attributes
  PID:1056
- C:\Windows\System32\attrib.exe
  "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\fgfgfg\$77a.exe"
  2⤵
  - Sets file to hidden
  - Views/modifies file attributes
  PID:3056
- C:\Windows\system32\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpD69.tmp.bat""
  2⤵
  - Loads dropped DLL
  - Suspicious use of WriteProcessMemory
  PID:2988
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:2848
- - C:\Users\Admin\fgfgfg\$77a.exe
    "C:\Users\Admin\fgfgfg\$77a.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:2560
  - - C:\Windows\system32\schtasks.exe
      "schtasks.exe" /query /TN $77a.exe
      4⤵
      PID:2588
  - - C:\Windows\system32\schtasks.exe
      "schtasks.exe" /Create /SC ONCE /TN "$77a.exe" /TR "C:\Users\Admin\fgfgfg\$77a.exe \"\$77a.exe\" /AsAdmin" /ST 00:01 /IT /F /RL HIGHEST
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:2548
  - - C:\Windows\system32\schtasks.exe
      "schtasks.exe" /query /TN $77a.exe
      4⤵
      PID:2608
  - - 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:1240

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

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmpD69.tmp.bat

Filesize
138B

MD5
ca75ae6bde2859b02567d5c32cb43628

SHA1
c1bd7c6a8b1df8697b82e5d363774d46bc26b607

SHA256
9ee59fa2ea7302a8b704c9b2e325f7bd2c224598d90d60b3f45bec6e70e93953

SHA512
c2f577d86486f986634e197968c1046f7d6ac2695bbf07a4acbbe71a60685d56ed144e828b25e77d410ca8788ffa6d90d28f2166958034286c8c1995d7efff54

Download Submit
C:\Users\Admin\fgfgfg\$77a.exe

Filesize
44KB

MD5
e4e58b0f1c15003574a494e4b48e3f9c

SHA1
fb63c0a2bf0f4b24e5b788196d98a358f754eb64

SHA256
0aabdf641f3d52d11b464745e1b42b091efa0e5ba91738bb1c11700b612d97e5

SHA512
cf27741f51a30f44e8d2abe9bbadeae20af85d0bae8da318e4af51635edd04448ada3c56d07f47a58df0e0da4585f5ff94ac43d26573d51df92b2008893c4744

Download Submit
memory/1240-22-0x000000001B820000-0x000000001BB02000-memory.dmp

Filesize
2.9MB

Download
memory/1240-23-0x0000000001C90000-0x0000000001C98000-memory.dmp

Filesize
32KB

Download
memory/2348-0-0x000007FEF6083000-0x000007FEF6084000-memory.dmp

Filesize
4KB

Download
memory/2348-1-0x000000013F780000-0x000000013F790000-memory.dmp

Filesize
64KB

Download
memory/2348-2-0x000007FEF6080000-0x000007FEF6A6C000-memory.dmp

Filesize
9.9MB

Download
memory/2348-4-0x000007FEF6083000-0x000007FEF6084000-memory.dmp

Filesize
4KB

Download
memory/2348-5-0x000007FEF6080000-0x000007FEF6A6C000-memory.dmp

Filesize
9.9MB

Download
memory/2348-14-0x000007FEF6080000-0x000007FEF6A6C000-memory.dmp

Filesize
9.9MB

Download
memory/2560-17-0x000000013F250000-0x000000013F260000-memory.dmp

Filesize
64KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads