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
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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
4904	attrib.exe
2940	attrib.exe

Checks computer location settings 2 TTPs 2 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-1-5-21-2045521122-590294423-3465680274-1000\Control Panel\International\Geo\Nation	17A1W_loader.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000\Control Panel\International\Geo\Nation	$77a.exe

Executes dropped EXE 1 IoCs

pid	Process
4712	$77a.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
1920	powershell.exe

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

Web Service

T1102

flow	ioc
23	discord.com
22	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
4764	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
3012	schtasks.exe

Suspicious behavior: EnumeratesProcesses 26 IoCs

pid	Process
3544	17A1W_loader.exe
3544	17A1W_loader.exe
3544	17A1W_loader.exe
3544	17A1W_loader.exe
3544	17A1W_loader.exe
3544	17A1W_loader.exe
3544	17A1W_loader.exe
3544	17A1W_loader.exe
3544	17A1W_loader.exe
3544	17A1W_loader.exe
3544	17A1W_loader.exe
3544	17A1W_loader.exe
3544	17A1W_loader.exe
3544	17A1W_loader.exe
3544	17A1W_loader.exe
3544	17A1W_loader.exe
3544	17A1W_loader.exe
3544	17A1W_loader.exe
3544	17A1W_loader.exe
3544	17A1W_loader.exe
3544	17A1W_loader.exe
3544	17A1W_loader.exe
3544	17A1W_loader.exe
1920	powershell.exe
1920	powershell.exe
4712	$77a.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	3544	17A1W_loader.exe
Token: SeDebugPrivilege	4712	$77a.exe
Token: SeDebugPrivilege	1920	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4712	$77a.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 3544 wrote to memory of 4904	3544	17A1W_loader.exe	86
PID 3544 wrote to memory of 4904	3544	17A1W_loader.exe	86
PID 3544 wrote to memory of 2940	3544	17A1W_loader.exe	88
PID 3544 wrote to memory of 2940	3544	17A1W_loader.exe	88
PID 3544 wrote to memory of 2380	3544	17A1W_loader.exe	100
PID 3544 wrote to memory of 2380	3544	17A1W_loader.exe	100
PID 2380 wrote to memory of 4764	2380	cmd.exe	102
PID 2380 wrote to memory of 4764	2380	cmd.exe	102
PID 2380 wrote to memory of 4712	2380	cmd.exe	103
PID 2380 wrote to memory of 4712	2380	cmd.exe	103
PID 4712 wrote to memory of 4320	4712	$77a.exe	105
PID 4712 wrote to memory of 4320	4712	$77a.exe	105
PID 4712 wrote to memory of 3012	4712	$77a.exe	108
PID 4712 wrote to memory of 3012	4712	$77a.exe	108
PID 4712 wrote to memory of 3412	4712	$77a.exe	110
PID 4712 wrote to memory of 3412	4712	$77a.exe	110
PID 4712 wrote to memory of 1920	4712	$77a.exe	112
PID 4712 wrote to memory of 1920	4712	$77a.exe	112

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
4904	attrib.exe
2940	attrib.exe

C:\Users\Admin\AppData\Local\Temp\17A1W_loader.exe
"C:\Users\Admin\AppData\Local\Temp\17A1W_loader.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3544
- 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:4904
- 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:2940
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp531C.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2380
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:4764
- - C:\Users\Admin\fgfgfg\$77a.exe
    "C:\Users\Admin\fgfgfg\$77a.exe"
    3⤵
    - Checks computer location settings
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:4712
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks.exe" /query /TN $77a.exe
      4⤵
      PID:4320
  - - 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:3012
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks.exe" /query /TN $77a.exe
      4⤵
      PID:3412
  - - 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:1920

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

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Web Service

1

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_5b0h4qsj.cxi.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp531C.tmp.bat

Filesize
139B

MD5
a38e8e4ee404d04109c6ca001704db36

SHA1
04a37ed643a239329ee2b96751215983b87148ff

SHA256
9ffcf209b366523f19bc433dd09c732381c1eb65d16aeadd4cb17094da65f746

SHA512
93dfc3e5625cb859d1bd2dd2a68047000e4ac8afb9d6d8b8dc2ac259b981794101685d925eed13d962107dd699af2cca296c97841f70bffd34856cdf5c13ed85

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

Filesize
44KB

MD5
e4e58b0f1c15003574a494e4b48e3f9c

SHA1
fb63c0a2bf0f4b24e5b788196d98a358f754eb64

SHA256
0aabdf641f3d52d11b464745e1b42b091efa0e5ba91738bb1c11700b612d97e5

SHA512
cf27741f51a30f44e8d2abe9bbadeae20af85d0bae8da318e4af51635edd04448ada3c56d07f47a58df0e0da4585f5ff94ac43d26573d51df92b2008893c4744

Download Submit
memory/1920-22-0x00000227EE240000-0x00000227EE262000-memory.dmp

Filesize
136KB

Download
memory/1920-25-0x00000227EE2F0000-0x00000227EE50C000-memory.dmp

Filesize
2.1MB

Download
memory/3544-0-0x00007FFCD4143000-0x00007FFCD4145000-memory.dmp

Filesize
8KB

Download
memory/3544-1-0x0000000000050000-0x0000000000060000-memory.dmp

Filesize
64KB

Download
memory/3544-2-0x00007FFCD4140000-0x00007FFCD4C01000-memory.dmp

Filesize
10.8MB

Download
memory/3544-4-0x00007FFCD4143000-0x00007FFCD4145000-memory.dmp

Filesize
8KB

Download
memory/3544-5-0x00007FFCD4140000-0x00007FFCD4C01000-memory.dmp

Filesize
10.8MB

Download
memory/3544-10-0x00007FFCD4140000-0x00007FFCD4C01000-memory.dmp

Filesize
10.8MB

Download
memory/4712-12-0x00007FFCD4163000-0x00007FFCD4165000-memory.dmp

Filesize
8KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads