silverrat | 520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087

General

Target

520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe
Size

100KB
MD5

8134eaadc12e38837613ed89f7c6efe7
SHA1

42cdb17054bcc801e43702047f82faa46cc46cf3
SHA256

520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087
SHA512

2a29655bfb7db756979bff50083871478bfeae6cde085dd34e943b6a326efe713c5378523ca109aecca2c1b15085d81672f63a42e02e94f2dd209a9d3fab5176
SSDEEP

3072:h0pKiIOfkFPsWy4cGAv9dDK4jzEyezhXCqFeZ+:MiFPsWyBv91K+stbes

Score

10^/10

silverrat defense_evasion execution persistence trojan

Malware Config

Extracted

Family

silverrat

Version

1.0.0.0

C2

127.0.0.1:9999

Mutex

lAxDBRhAFu

Attributes

certificate
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
decrypted_key
-|S.S.S|-
key
yy6zDjAUmbB09pKvo5Hhug==
key_x509
RWNrQ1R6bExNUXloekVPSmdmT3dsR0RXeHNFRFNU
reconnect_delay
2
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.

defense_evasion

Hidden Files and Directories

T1564.001

pid	Process
3488	attrib.exe
1572	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-1-5-21-83325578-304917428-1200496059-1000\Control Panel\International\Geo\Nation	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe
Key value queried	\REGISTRY\USER\S-1-5-21-83325578-304917428-1200496059-1000\Control Panel\International\Geo\Nation	$77Louis.exe.exe

Executes dropped EXE 2 IoCs

pid	Process
1456	$77Louis.exe.exe
1976	$77Louis.exe.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\\aa\\$77Louis.exe.exe\""	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
4772	powershell.exe

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

defense_evasion

pid	Process
4324	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
5912	schtasks.exe
1244	schtasks.exe

Suspicious behavior: EnumeratesProcesses 26 IoCs

pid	Process
4308	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe
4308	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe
4308	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe
4308	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe
4308	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe
4308	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe
4308	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe
4308	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe
4308	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe
4308	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe
4308	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe
4308	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe
4308	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe
4308	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe
4308	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe
4308	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe
4308	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe
4308	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe
4308	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe
4308	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe
4308	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe
4308	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe
4308	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe
1456	$77Louis.exe.exe
4772	powershell.exe
4772	powershell.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	4308	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe
Token: SeDebugPrivilege	1456	$77Louis.exe.exe
Token: SeDebugPrivilege	4772	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1456	$77Louis.exe.exe

Suspicious use of WriteProcessMemory 22 IoCs

description	pid	Process	procid_target
PID 4308 wrote to memory of 1572	4308	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe	91
PID 4308 wrote to memory of 1572	4308	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe	91
PID 4308 wrote to memory of 3488	4308	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe	93
PID 4308 wrote to memory of 3488	4308	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe	93
PID 4308 wrote to memory of 2764	4308	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe	101
PID 4308 wrote to memory of 2764	4308	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe	101
PID 2764 wrote to memory of 4324	2764	cmd.exe	104
PID 2764 wrote to memory of 4324	2764	cmd.exe	104
PID 1056 wrote to memory of 1456	1056	cmd.exe	105
PID 1056 wrote to memory of 1456	1056	cmd.exe	105
PID 2764 wrote to memory of 1976	2764	cmd.exe	106
PID 2764 wrote to memory of 1976	2764	cmd.exe	106
PID 1456 wrote to memory of 2124	1456	$77Louis.exe.exe	107
PID 1456 wrote to memory of 2124	1456	$77Louis.exe.exe	107
PID 1456 wrote to memory of 5912	1456	$77Louis.exe.exe	109
PID 1456 wrote to memory of 5912	1456	$77Louis.exe.exe	109
PID 1456 wrote to memory of 3936	1456	$77Louis.exe.exe	111
PID 1456 wrote to memory of 3936	1456	$77Louis.exe.exe	111
PID 1456 wrote to memory of 4772	1456	$77Louis.exe.exe	113
PID 1456 wrote to memory of 4772	1456	$77Louis.exe.exe	113
PID 1456 wrote to memory of 1244	1456	$77Louis.exe.exe	114
PID 1456 wrote to memory of 1244	1456	$77Louis.exe.exe	114

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

defense_evasion

Hidden Files and Directories

T1564.001

pid	Process
1572	attrib.exe
3488	attrib.exe

C:\Users\Admin\AppData\Local\Temp\520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe
"C:\Users\Admin\AppData\Local\Temp\520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4308
- C:\Windows\System32\attrib.exe
  "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\aa"
  2⤵
  - Sets file to hidden
  - Views/modifies file attributes
  PID:1572
- C:\Windows\System32\attrib.exe
  "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\aa\$77Louis.exe.exe"
  2⤵
  - Sets file to hidden
  - Views/modifies file attributes
  PID:3488
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpC208.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2764
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:4324
- - C:\Users\Admin\aa\$77Louis.exe.exe
    "C:\Users\Admin\aa\$77Louis.exe.exe"
    3⤵
    - Executes dropped EXE
    PID:1976

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c "C:\Users\Admin\aa\$77Louis.exe.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1056
- C:\Users\Admin\aa\$77Louis.exe.exe
  C:\Users\Admin\aa\$77Louis.exe.exe
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1456
- - C:\Windows\system32\schtasks.exe
    "schtasks.exe" /query /TN $77Louis.exe.exe
    3⤵
    PID:2124
- - C:\Windows\system32\schtasks.exe
    "schtasks.exe" /Create /SC ONCE /TN "$77Louis.exe.exe" /TR "C:\Users\Admin\aa\$77Louis.exe.exe \"\$77Louis.exe.exe\" /AsAdmin" /ST 00:01 /IT /F /RL HIGHEST
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:5912
- - C:\Windows\system32\schtasks.exe
    "schtasks.exe" /query /TN $77Louis.exe.exe
    3⤵
    PID:3936
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Set-MpPreference -ExclusionExtension exe,bat,dll,ps1;exit
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4772
- - C:\Windows\System32\schtasks.exe
    "C:\Windows\System32\schtasks.exe" /create /sc daily /tn "Louis.exe_Task-DAILY-21PM" /TR "%MyFile%" /ST 21:00
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:1244

Network

MITRE ATT&CK Enterprise v16

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

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_2rvagzio.vxt.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpC208.tmp.bat

Filesize
143B

MD5
eab87e02090b0b1382a3def57389868d

SHA1
982530486c92513a1b172e0ff4c3a5cb0b1b0bec

SHA256
26aba2b3f58272fa3823583f19c0523be1a3b9b4a855c63ba1007aff63324847

SHA512
54f3248a4387a06743c1c8b71f42e22cf36bcb7b53f89c533f6bab7beff4e695feb5ee8258436bcf3c413f1e698f3511606b70526f37976c6ca54d12e5965cf7

Download Submit
C:\Users\Admin\aa\$77Louis.exe.exe

Filesize
100KB

MD5
8134eaadc12e38837613ed89f7c6efe7

SHA1
42cdb17054bcc801e43702047f82faa46cc46cf3

SHA256
520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087

SHA512
2a29655bfb7db756979bff50083871478bfeae6cde085dd34e943b6a326efe713c5378523ca109aecca2c1b15085d81672f63a42e02e94f2dd209a9d3fab5176

Download Submit
memory/4308-0-0x00007FFFBF5F3000-0x00007FFFBF5F5000-memory.dmp

Filesize
8KB

Download
memory/4308-1-0x0000000000320000-0x0000000000330000-memory.dmp

Filesize
64KB

Download
memory/4308-2-0x00007FFFBF5F0000-0x00007FFFC00B1000-memory.dmp

Filesize
10.8MB

Download
memory/4308-3-0x00007FFFBF5F3000-0x00007FFFBF5F5000-memory.dmp

Filesize
8KB

Download
memory/4308-4-0x00007FFFBF5F0000-0x00007FFFC00B1000-memory.dmp

Filesize
10.8MB

Download
memory/4308-9-0x00007FFFBF5F0000-0x00007FFFC00B1000-memory.dmp

Filesize
10.8MB

Download
memory/4772-20-0x0000024EF3D30000-0x0000024EF3D52000-memory.dmp

Filesize
136KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads