silverrat | 818f5550abd2e06a7272f7e93a5e958c730ed8e72723cd6302205871e6dc4da6

General

Target

818f5550abd2e06a7272f7e93a5e958c730ed8e72723cd6302205871e6dc4da6.exe
Size

43KB
MD5

d83f71291c934a140c4822ca8d763158
SHA1

372ea7bc3dfee39e6e6713a70bf185e7793b8d1e
SHA256

818f5550abd2e06a7272f7e93a5e958c730ed8e72723cd6302205871e6dc4da6
SHA512

222228e0502c49d813e996d9454adc064c099f622ea0dc776fd0258d8e200d9aab1c7e1793e719647d673e82643eaf12cc553aeaa57239552146f461a274af66
SSDEEP

768:h08uK5B9mKxYV6Ofi/2iZHFPs+nEsJCSZbYvlGGooooizJjwRUT0v9SRHEcaeB6T:h0pKiIOf9GFPs+nEFWJjwGAv9OEWo+/Y

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
5308	attrib.exe
4584	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-1-5-21-3027557611-1484967174-339164627-1000\Control Panel\International\Geo\Nation	818f5550abd2e06a7272f7e93a5e958c730ed8e72723cd6302205871e6dc4da6.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3027557611-1484967174-339164627-1000\Control Panel\International\Geo\Nation	$77Louis.exe.exe

Executes dropped EXE 2 IoCs

pid	Process
5216	$77Louis.exe.exe
3672	$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\""	818f5550abd2e06a7272f7e93a5e958c730ed8e72723cd6302205871e6dc4da6.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
5712	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
2688	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
4756	schtasks.exe
3696	schtasks.exe

Suspicious behavior: EnumeratesProcesses 24 IoCs

pid	Process
2872	818f5550abd2e06a7272f7e93a5e958c730ed8e72723cd6302205871e6dc4da6.exe
2872	818f5550abd2e06a7272f7e93a5e958c730ed8e72723cd6302205871e6dc4da6.exe
2872	818f5550abd2e06a7272f7e93a5e958c730ed8e72723cd6302205871e6dc4da6.exe
2872	818f5550abd2e06a7272f7e93a5e958c730ed8e72723cd6302205871e6dc4da6.exe
2872	818f5550abd2e06a7272f7e93a5e958c730ed8e72723cd6302205871e6dc4da6.exe
2872	818f5550abd2e06a7272f7e93a5e958c730ed8e72723cd6302205871e6dc4da6.exe
2872	818f5550abd2e06a7272f7e93a5e958c730ed8e72723cd6302205871e6dc4da6.exe
2872	818f5550abd2e06a7272f7e93a5e958c730ed8e72723cd6302205871e6dc4da6.exe
2872	818f5550abd2e06a7272f7e93a5e958c730ed8e72723cd6302205871e6dc4da6.exe
2872	818f5550abd2e06a7272f7e93a5e958c730ed8e72723cd6302205871e6dc4da6.exe
2872	818f5550abd2e06a7272f7e93a5e958c730ed8e72723cd6302205871e6dc4da6.exe
2872	818f5550abd2e06a7272f7e93a5e958c730ed8e72723cd6302205871e6dc4da6.exe
2872	818f5550abd2e06a7272f7e93a5e958c730ed8e72723cd6302205871e6dc4da6.exe
2872	818f5550abd2e06a7272f7e93a5e958c730ed8e72723cd6302205871e6dc4da6.exe
2872	818f5550abd2e06a7272f7e93a5e958c730ed8e72723cd6302205871e6dc4da6.exe
2872	818f5550abd2e06a7272f7e93a5e958c730ed8e72723cd6302205871e6dc4da6.exe
2872	818f5550abd2e06a7272f7e93a5e958c730ed8e72723cd6302205871e6dc4da6.exe
2872	818f5550abd2e06a7272f7e93a5e958c730ed8e72723cd6302205871e6dc4da6.exe
2872	818f5550abd2e06a7272f7e93a5e958c730ed8e72723cd6302205871e6dc4da6.exe
2872	818f5550abd2e06a7272f7e93a5e958c730ed8e72723cd6302205871e6dc4da6.exe
2872	818f5550abd2e06a7272f7e93a5e958c730ed8e72723cd6302205871e6dc4da6.exe
5216	$77Louis.exe.exe
5712	powershell.exe
5712	powershell.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	2872	818f5550abd2e06a7272f7e93a5e958c730ed8e72723cd6302205871e6dc4da6.exe
Token: SeDebugPrivilege	5216	$77Louis.exe.exe
Token: SeDebugPrivilege	5712	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
5216	$77Louis.exe.exe

Suspicious use of WriteProcessMemory 22 IoCs

description	pid	Process	procid_target
PID 2872 wrote to memory of 5308	2872	818f5550abd2e06a7272f7e93a5e958c730ed8e72723cd6302205871e6dc4da6.exe	89
PID 2872 wrote to memory of 5308	2872	818f5550abd2e06a7272f7e93a5e958c730ed8e72723cd6302205871e6dc4da6.exe	89
PID 2872 wrote to memory of 4584	2872	818f5550abd2e06a7272f7e93a5e958c730ed8e72723cd6302205871e6dc4da6.exe	91
PID 2872 wrote to memory of 4584	2872	818f5550abd2e06a7272f7e93a5e958c730ed8e72723cd6302205871e6dc4da6.exe	91
PID 2872 wrote to memory of 4824	2872	818f5550abd2e06a7272f7e93a5e958c730ed8e72723cd6302205871e6dc4da6.exe	94
PID 2872 wrote to memory of 4824	2872	818f5550abd2e06a7272f7e93a5e958c730ed8e72723cd6302205871e6dc4da6.exe	94
PID 4824 wrote to memory of 2688	4824	cmd.exe	97
PID 4824 wrote to memory of 2688	4824	cmd.exe	97
PID 4816 wrote to memory of 5216	4816	cmd.exe	98
PID 4816 wrote to memory of 5216	4816	cmd.exe	98
PID 4824 wrote to memory of 3672	4824	cmd.exe	99
PID 4824 wrote to memory of 3672	4824	cmd.exe	99
PID 5216 wrote to memory of 4972	5216	$77Louis.exe.exe	100
PID 5216 wrote to memory of 4972	5216	$77Louis.exe.exe	100
PID 5216 wrote to memory of 4756	5216	$77Louis.exe.exe	102
PID 5216 wrote to memory of 4756	5216	$77Louis.exe.exe	102
PID 5216 wrote to memory of 5024	5216	$77Louis.exe.exe	104
PID 5216 wrote to memory of 5024	5216	$77Louis.exe.exe	104
PID 5216 wrote to memory of 5712	5216	$77Louis.exe.exe	106
PID 5216 wrote to memory of 5712	5216	$77Louis.exe.exe	106
PID 5216 wrote to memory of 3696	5216	$77Louis.exe.exe	108
PID 5216 wrote to memory of 3696	5216	$77Louis.exe.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

Views/modifies file attributes 1 TTPs 2 IoCs

defense_evasion

Hidden Files and Directories

T1564.001

pid	Process
5308	attrib.exe
4584	attrib.exe

C:\Users\Admin\AppData\Local\Temp\818f5550abd2e06a7272f7e93a5e958c730ed8e72723cd6302205871e6dc4da6.exe
"C:\Users\Admin\AppData\Local\Temp\818f5550abd2e06a7272f7e93a5e958c730ed8e72723cd6302205871e6dc4da6.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2872
- 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:5308
- 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:4584
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpC488.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4824
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:2688
- - C:\Users\Admin\aa\$77Louis.exe.exe
    "C:\Users\Admin\aa\$77Louis.exe.exe"
    3⤵
    - Executes dropped EXE
    PID:3672

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c "C:\Users\Admin\aa\$77Louis.exe.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:4816
- 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:5216
- - C:\Windows\system32\schtasks.exe
    "schtasks.exe" /query /TN $77Louis.exe.exe
    3⤵
    PID:4972
- - 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:4756
- - C:\Windows\system32\schtasks.exe
    "schtasks.exe" /query /TN $77Louis.exe.exe
    3⤵
    PID:5024
- - 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:5712
- - 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:3696

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_1gkfnioq.oce.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpC488.tmp.bat

Filesize
143B

MD5
def8e4a279a8488cae77dd7a160ce2d7

SHA1
0518f36e7009136693454ed5aeb7ea6989de0abd

SHA256
62e5542b58a2d291778bb283bf1e55d7847390d4cecdc6da000791ea87f9862a

SHA512
eac98064bc7ffb7c84dba8d11724d7b7cd8befb62e9af8e44e738df3b30aab70d9cd925d055e25af4ee0472f1c090436d259cd477b490b95bcee4bbe2afe2ee8

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

Filesize
43KB

MD5
d83f71291c934a140c4822ca8d763158

SHA1
372ea7bc3dfee39e6e6713a70bf185e7793b8d1e

SHA256
818f5550abd2e06a7272f7e93a5e958c730ed8e72723cd6302205871e6dc4da6

SHA512
222228e0502c49d813e996d9454adc064c099f622ea0dc776fd0258d8e200d9aab1c7e1793e719647d673e82643eaf12cc553aeaa57239552146f461a274af66

Download Submit
memory/2872-0-0x00007FFA5D303000-0x00007FFA5D305000-memory.dmp

Filesize
8KB

Download
memory/2872-1-0x0000000000DC0000-0x0000000000DD0000-memory.dmp

Filesize
64KB

Download
memory/2872-2-0x00007FFA5D300000-0x00007FFA5DDC1000-memory.dmp

Filesize
10.8MB

Download
memory/2872-3-0x00007FFA5D303000-0x00007FFA5D305000-memory.dmp

Filesize
8KB

Download
memory/2872-4-0x00007FFA5D300000-0x00007FFA5DDC1000-memory.dmp

Filesize
10.8MB

Download
memory/2872-9-0x00007FFA5D300000-0x00007FFA5DDC1000-memory.dmp

Filesize
10.8MB

Download
memory/5712-20-0x00000264EBDE0000-0x00000264EBE02000-memory.dmp

Filesize
136KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads