silverrat | b57b6603c03bf53c7dd01806678f75ee6c4fe82f17a7abb5e7a0baf555d22252

General

Target

b57b6603c03bf53c7dd01806678f75ee6c4fe82f17a7abb5e7a0baf555d22252N.exe
Size

85KB
MD5

15cae69282880edaf7ca090ab51089a0
SHA1

a0ce11fd82a53b9559a6f2f1c64e8764ee4ea475
SHA256

b57b6603c03bf53c7dd01806678f75ee6c4fe82f17a7abb5e7a0baf555d22252
SHA512

85e4a8727267533e6dcfb2430c3fff48d897127efecd8d560ee3c5562e018f484de229b8dc48224490de177f336016330c2d00335a1ba0208311d297df170045
SSDEEP

1536:lI76Wj54gtfoQggNPlcULTP9I7rB6embRdyVfkFHLXkFyxwdSn2OJ:lI7RgONc6T1/bkCHLXkFyxWs5J

Score

10^/10

silverrat evasion execution persistence trojan

Malware Config

Extracted

Family

silverrat

Version

1.0.0.0

C2

147.185.221.17:32088

Mutex

SilverMutex_gRDGEIDSol

Attributes

certificate
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
decrypted_key
-|S.S.S|-
discord
https://discord.com/api/webhooks/1317585089491767437/EBZbSF2FiNBbHexoCGKLxakpdgSZYjt6BQiH3BvbQugwGwkh8GiPw2PK5PuIKigfB8xR
key
yy6zDjAUmbB09pKvo5Hhug==
key_x509
VHdXZ3R2VEpOVWFNeEFGY0R0RlNIQVJSRFJrbm56
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
1184	attrib.exe
4836	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-1-5-21-3442511616-637977696-3186306149-1000\Control Panel\International\Geo\Nation	b57b6603c03bf53c7dd01806678f75ee6c4fe82f17a7abb5e7a0baf555d22252N.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3442511616-637977696-3186306149-1000\Control Panel\International\Geo\Nation	$77bot.exe

Executes dropped EXE 1 IoCs

pid	Process
212	$77bot.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\\AppData\\Roaming\\bot\\$77bot.exe\""	b57b6603c03bf53c7dd01806678f75ee6c4fe82f17a7abb5e7a0baf555d22252N.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
5092	powershell.exe

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

Web Service

T1102

flow	ioc
22	discord.com
23	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
4216	timeout.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
2912	schtasks.exe
384	schtasks.exe

Suspicious behavior: EnumeratesProcesses 26 IoCs

pid	Process
3644	b57b6603c03bf53c7dd01806678f75ee6c4fe82f17a7abb5e7a0baf555d22252N.exe
3644	b57b6603c03bf53c7dd01806678f75ee6c4fe82f17a7abb5e7a0baf555d22252N.exe
3644	b57b6603c03bf53c7dd01806678f75ee6c4fe82f17a7abb5e7a0baf555d22252N.exe
3644	b57b6603c03bf53c7dd01806678f75ee6c4fe82f17a7abb5e7a0baf555d22252N.exe
3644	b57b6603c03bf53c7dd01806678f75ee6c4fe82f17a7abb5e7a0baf555d22252N.exe
3644	b57b6603c03bf53c7dd01806678f75ee6c4fe82f17a7abb5e7a0baf555d22252N.exe
3644	b57b6603c03bf53c7dd01806678f75ee6c4fe82f17a7abb5e7a0baf555d22252N.exe
3644	b57b6603c03bf53c7dd01806678f75ee6c4fe82f17a7abb5e7a0baf555d22252N.exe
3644	b57b6603c03bf53c7dd01806678f75ee6c4fe82f17a7abb5e7a0baf555d22252N.exe
3644	b57b6603c03bf53c7dd01806678f75ee6c4fe82f17a7abb5e7a0baf555d22252N.exe
3644	b57b6603c03bf53c7dd01806678f75ee6c4fe82f17a7abb5e7a0baf555d22252N.exe
3644	b57b6603c03bf53c7dd01806678f75ee6c4fe82f17a7abb5e7a0baf555d22252N.exe
3644	b57b6603c03bf53c7dd01806678f75ee6c4fe82f17a7abb5e7a0baf555d22252N.exe
3644	b57b6603c03bf53c7dd01806678f75ee6c4fe82f17a7abb5e7a0baf555d22252N.exe
3644	b57b6603c03bf53c7dd01806678f75ee6c4fe82f17a7abb5e7a0baf555d22252N.exe
3644	b57b6603c03bf53c7dd01806678f75ee6c4fe82f17a7abb5e7a0baf555d22252N.exe
3644	b57b6603c03bf53c7dd01806678f75ee6c4fe82f17a7abb5e7a0baf555d22252N.exe
3644	b57b6603c03bf53c7dd01806678f75ee6c4fe82f17a7abb5e7a0baf555d22252N.exe
3644	b57b6603c03bf53c7dd01806678f75ee6c4fe82f17a7abb5e7a0baf555d22252N.exe
3644	b57b6603c03bf53c7dd01806678f75ee6c4fe82f17a7abb5e7a0baf555d22252N.exe
3644	b57b6603c03bf53c7dd01806678f75ee6c4fe82f17a7abb5e7a0baf555d22252N.exe
3644	b57b6603c03bf53c7dd01806678f75ee6c4fe82f17a7abb5e7a0baf555d22252N.exe
3644	b57b6603c03bf53c7dd01806678f75ee6c4fe82f17a7abb5e7a0baf555d22252N.exe
5092	powershell.exe
5092	powershell.exe
212	$77bot.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeBackupPrivilege	4232	vssvc.exe
Token: SeRestorePrivilege	4232	vssvc.exe
Token: SeAuditPrivilege	4232	vssvc.exe
Token: SeDebugPrivilege	3644	b57b6603c03bf53c7dd01806678f75ee6c4fe82f17a7abb5e7a0baf555d22252N.exe
Token: SeDebugPrivilege	212	$77bot.exe
Token: SeDebugPrivilege	5092	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
212	$77bot.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 3644 wrote to memory of 1184	3644	b57b6603c03bf53c7dd01806678f75ee6c4fe82f17a7abb5e7a0baf555d22252N.exe	86
PID 3644 wrote to memory of 1184	3644	b57b6603c03bf53c7dd01806678f75ee6c4fe82f17a7abb5e7a0baf555d22252N.exe	86
PID 3644 wrote to memory of 4836	3644	b57b6603c03bf53c7dd01806678f75ee6c4fe82f17a7abb5e7a0baf555d22252N.exe	88
PID 3644 wrote to memory of 4836	3644	b57b6603c03bf53c7dd01806678f75ee6c4fe82f17a7abb5e7a0baf555d22252N.exe	88
PID 3644 wrote to memory of 1616	3644	b57b6603c03bf53c7dd01806678f75ee6c4fe82f17a7abb5e7a0baf555d22252N.exe	96
PID 3644 wrote to memory of 1616	3644	b57b6603c03bf53c7dd01806678f75ee6c4fe82f17a7abb5e7a0baf555d22252N.exe	96
PID 1616 wrote to memory of 4216	1616	cmd.exe	98
PID 1616 wrote to memory of 4216	1616	cmd.exe	98
PID 1616 wrote to memory of 212	1616	cmd.exe	99
PID 1616 wrote to memory of 212	1616	cmd.exe	99
PID 212 wrote to memory of 5004	212	$77bot.exe	101
PID 212 wrote to memory of 5004	212	$77bot.exe	101
PID 212 wrote to memory of 2912	212	$77bot.exe	103
PID 212 wrote to memory of 2912	212	$77bot.exe	103
PID 212 wrote to memory of 468	212	$77bot.exe	105
PID 212 wrote to memory of 468	212	$77bot.exe	105
PID 212 wrote to memory of 5092	212	$77bot.exe	107
PID 212 wrote to memory of 5092	212	$77bot.exe	107
PID 212 wrote to memory of 384	212	$77bot.exe	108
PID 212 wrote to memory of 384	212	$77bot.exe	108

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
1184	attrib.exe
4836	attrib.exe

C:\Users\Admin\AppData\Local\Temp\b57b6603c03bf53c7dd01806678f75ee6c4fe82f17a7abb5e7a0baf555d22252N.exe
"C:\Users\Admin\AppData\Local\Temp\b57b6603c03bf53c7dd01806678f75ee6c4fe82f17a7abb5e7a0baf555d22252N.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3644
- C:\Windows\System32\attrib.exe
  "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\AppData\Roaming\bot"
  2⤵
  - Sets file to hidden
  - Views/modifies file attributes
  PID:1184
- C:\Windows\System32\attrib.exe
  "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\AppData\Roaming\bot\$77bot.exe"
  2⤵
  - Sets file to hidden
  - Views/modifies file attributes
  PID:4836
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpCF56.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1616
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:4216
- - C:\Users\Admin\AppData\Roaming\bot\$77bot.exe
    "C:\Users\Admin\AppData\Roaming\bot\$77bot.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:212
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks.exe" /query /TN $77bot.exe
      4⤵
      PID:5004
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks.exe" /Create /SC ONCE /TN "$77bot.exe" /TR "C:\Users\Admin\AppData\Roaming\bot\$77bot.exe \"\$77bot.exe\" /AsAdmin" /ST 00:01 /IT /F /RL HIGHEST
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:2912
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks.exe" /query /TN $77bot.exe
      4⤵
      PID:468
  - - 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:5092
  - - C:\Windows\System32\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /create /sc weekly /d SUN /tn "bot_Task-WEEKLY-01" /tr "%MyFile%" /st 10:00
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:384

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:4232

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

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_dfr5i3vv.qof.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpCF56.tmp.bat

Filesize
154B

MD5
ab2db0be0693cffd646f4f8407b5bb4f

SHA1
1e6900e43b1b3dae4c599c15cfb0460d3f913a2b

SHA256
6bde98c9b2318178e91bfd88531f5a5c1b17b6bbb5be39aabc79f2d3ba24bc98

SHA512
1072cc3cc654035950670882ef8f8086c8724478efabbc965904be9b60b5867523970435729837bb5998d75879944c429db9df98bc8ae4e10625bb004e316345

Download Submit
C:\Users\Admin\AppData\Roaming\bot\$77bot.exe

Filesize
85KB

MD5
15cae69282880edaf7ca090ab51089a0

SHA1
a0ce11fd82a53b9559a6f2f1c64e8764ee4ea475

SHA256
b57b6603c03bf53c7dd01806678f75ee6c4fe82f17a7abb5e7a0baf555d22252

SHA512
85e4a8727267533e6dcfb2430c3fff48d897127efecd8d560ee3c5562e018f484de229b8dc48224490de177f336016330c2d00335a1ba0208311d297df170045

Download Submit
memory/3644-0-0x00007FFEC1A63000-0x00007FFEC1A65000-memory.dmp

Filesize
8KB

Download
memory/3644-1-0x0000000000680000-0x000000000069A000-memory.dmp

Filesize
104KB

Download
memory/3644-2-0x0000000000F50000-0x0000000000F66000-memory.dmp

Filesize
88KB

Download
memory/3644-3-0x00007FFEC1A60000-0x00007FFEC2521000-memory.dmp

Filesize
10.8MB

Download
memory/3644-4-0x00007FFEC1A63000-0x00007FFEC1A65000-memory.dmp

Filesize
8KB

Download
memory/3644-5-0x00007FFEC1A60000-0x00007FFEC2521000-memory.dmp

Filesize
10.8MB

Download
memory/3644-11-0x00007FFEC1A60000-0x00007FFEC2521000-memory.dmp

Filesize
10.8MB

Download
memory/5092-15-0x000001FBC4D40000-0x000001FBC4D62000-memory.dmp

Filesize
136KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads