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
3164	attrib.exe
3040	attrib.exe

Executes dropped EXE 2 IoCs

pid	Process
5564	$77Louis.exe.exe
2232	$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
2348	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
2424	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
4540	schtasks.exe
2780	schtasks.exe

Suspicious behavior: EnumeratesProcesses 22 IoCs

pid	Process
4836	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe
4836	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe
4836	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe
4836	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe
4836	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe
4836	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe
4836	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe
4836	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe
4836	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe
4836	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe
4836	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe
4836	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe
4836	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe
4836	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe
4836	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe
4836	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe
4836	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe
4836	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe
4836	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe
5564	$77Louis.exe.exe
2348	powershell.exe
2348	powershell.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	4836	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe
Token: SeDebugPrivilege	5564	$77Louis.exe.exe
Token: SeDebugPrivilege	2348	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
5564	$77Louis.exe.exe

Suspicious use of WriteProcessMemory 22 IoCs

description	pid	Process	procid_target
PID 4836 wrote to memory of 3164	4836	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe	84
PID 4836 wrote to memory of 3164	4836	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe	84
PID 4836 wrote to memory of 3040	4836	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe	86
PID 4836 wrote to memory of 3040	4836	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe	86
PID 4836 wrote to memory of 1028	4836	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe	88
PID 4836 wrote to memory of 1028	4836	520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe	88
PID 1028 wrote to memory of 2424	1028	cmd.exe	92
PID 1028 wrote to memory of 2424	1028	cmd.exe	92
PID 3068 wrote to memory of 5564	3068	cmd.exe	93
PID 3068 wrote to memory of 5564	3068	cmd.exe	93
PID 1028 wrote to memory of 2232	1028	cmd.exe	94
PID 1028 wrote to memory of 2232	1028	cmd.exe	94
PID 5564 wrote to memory of 5192	5564	$77Louis.exe.exe	95
PID 5564 wrote to memory of 5192	5564	$77Louis.exe.exe	95
PID 5564 wrote to memory of 4540	5564	$77Louis.exe.exe	97
PID 5564 wrote to memory of 4540	5564	$77Louis.exe.exe	97
PID 5564 wrote to memory of 564	5564	$77Louis.exe.exe	99
PID 5564 wrote to memory of 564	5564	$77Louis.exe.exe	99
PID 5564 wrote to memory of 2348	5564	$77Louis.exe.exe	101
PID 5564 wrote to memory of 2348	5564	$77Louis.exe.exe	101
PID 5564 wrote to memory of 2780	5564	$77Louis.exe.exe	103
PID 5564 wrote to memory of 2780	5564	$77Louis.exe.exe	103

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
3164	attrib.exe
3040	attrib.exe

C:\Users\Admin\AppData\Local\Temp\520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe
"C:\Users\Admin\AppData\Local\Temp\520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087.exe"
1⤵
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4836
- 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:3164
- 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:3040
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpC7F3.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1028
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:2424
- - C:\Users\Admin\aa\$77Louis.exe.exe
    "C:\Users\Admin\aa\$77Louis.exe.exe"
    3⤵
    - Executes dropped EXE
    PID:2232

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c "C:\Users\Admin\aa\$77Louis.exe.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:3068
- C:\Users\Admin\aa\$77Louis.exe.exe
  C:\Users\Admin\aa\$77Louis.exe.exe
  2⤵
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:5564
- - C:\Windows\system32\schtasks.exe
    "schtasks.exe" /query /TN $77Louis.exe.exe
    3⤵
    PID:5192
- - 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:4540
- - C:\Windows\system32\schtasks.exe
    "schtasks.exe" /query /TN $77Louis.exe.exe
    3⤵
    PID:564
- - 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:2348
- - 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:2780

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

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_qof3kjrw.pta.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpC7F3.tmp.bat

Filesize
143B

MD5
80eb6fff461eb6bd489f92ccdad33e57

SHA1
bdbd623561c3861ba60b1e6d9cb006e2aa7a1902

SHA256
f952012d69710b7a4a26cc578580d980beac5dc40cea58087b3ffa7a38ece69e

SHA512
e6950718c0c7783859785da191d3009f76b57c8ed21185452a86626c9804c8880578d2903f11ec640195935dfa4d251fc63fafa1e6a7ac4eb90046778a3a9835

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

Filesize
100KB

MD5
8134eaadc12e38837613ed89f7c6efe7

SHA1
42cdb17054bcc801e43702047f82faa46cc46cf3

SHA256
520a81849a039614694006ad50ba787a916c10bdc10f45c25f557c54e8a99087

SHA512
2a29655bfb7db756979bff50083871478bfeae6cde085dd34e943b6a326efe713c5378523ca109aecca2c1b15085d81672f63a42e02e94f2dd209a9d3fab5176

Download Submit
memory/2348-23-0x00000242A5030000-0x00000242A5052000-memory.dmp

Filesize
136KB

Download
memory/4836-0-0x00007FFBDF4B3000-0x00007FFBDF4B5000-memory.dmp

Filesize
8KB

Download
memory/4836-1-0x00000000006A0000-0x00000000006B0000-memory.dmp

Filesize
64KB

Download
memory/4836-2-0x00007FFBDF4B0000-0x00007FFBDFF72000-memory.dmp

Filesize
10.8MB

Download
memory/4836-3-0x00007FFBDF4B3000-0x00007FFBDF4B5000-memory.dmp

Filesize
8KB

Download
memory/4836-4-0x00007FFBDF4B0000-0x00007FFBDFF72000-memory.dmp

Filesize
10.8MB

Download
memory/4836-9-0x00007FFBDF4B0000-0x00007FFBDFF72000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads