silverrat | 7be0033e27b08c8e5f43200259ce3bfd1129b653789664c175342fb3fcb9405a

General

Target

SilverClient.exe
Size

43KB
MD5

79d47169908067917d7b01838e512d4e
SHA1

f9e4dbfad432da6bf68b72e60fed8b39b0465fdd
SHA256

7be0033e27b08c8e5f43200259ce3bfd1129b653789664c175342fb3fcb9405a
SHA512

f72a331379d8d595843b4515d96286871e4cfdc3c866c1cc0a6779a1e6b0b127cd2eea2615ab78f754b1c0fb0c51ed33ee02975945539f532ce597e5f68a875e
SSDEEP

768:9uIQbKCHbymqTYV6O1i/MiZHFPsenEsJCSZbYvlGGooooizJjVRUT0v9SFHXhXBu:UIEKCtIO1nGFPsenEFWJjVGAv9OBoY/Y

Score

10^/10

silverrat evasion execution persistence trojan

Malware Config

Extracted

Family

silverrat

Version

1.0.0.0

C2

following-geometry.gl.at.ply.gg:11493

Mutex

SilverMutex_VEYRwaRvUo

Attributes

certificate
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
decrypted_key
-|S.S.S|-
key
yy6zDjAUmbB09pKvo5Hhug==
key_x509
U0tZRVJueVNXY2NSek1admhOVFlpc0JFcFJHbWVN
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
4652	attrib.exe
3468	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-1-5-21-493223053-2004649691-1575712786-1000\Control Panel\International\Geo\Nation	SilverClient.exe
Key value queried	\REGISTRY\USER\S-1-5-21-493223053-2004649691-1575712786-1000\Control Panel\International\Geo\Nation	$77Ponispro.exe

Executes dropped EXE 1 IoCs

pid	Process
2780	$77Ponispro.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\\system64\\$77Ponispro.exe\""	SilverClient.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
1864	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

evasion

pid	Process
2784	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
3652	schtasks.exe
4848	schtasks.exe

Suspicious behavior: EnumeratesProcesses 26 IoCs

pid	Process
1628	SilverClient.exe
1628	SilverClient.exe
1628	SilverClient.exe
1628	SilverClient.exe
1628	SilverClient.exe
1628	SilverClient.exe
1628	SilverClient.exe
1628	SilverClient.exe
1628	SilverClient.exe
1628	SilverClient.exe
1628	SilverClient.exe
1628	SilverClient.exe
1628	SilverClient.exe
1628	SilverClient.exe
1628	SilverClient.exe
1628	SilverClient.exe
1628	SilverClient.exe
1628	SilverClient.exe
1628	SilverClient.exe
1628	SilverClient.exe
1628	SilverClient.exe
1628	SilverClient.exe
1628	SilverClient.exe
2780	$77Ponispro.exe
1864	powershell.exe
1864	powershell.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	1628	SilverClient.exe
Token: SeDebugPrivilege	2780	$77Ponispro.exe
Token: SeDebugPrivilege	1864	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2780	$77Ponispro.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 1628 wrote to memory of 4652	1628	SilverClient.exe	85
PID 1628 wrote to memory of 4652	1628	SilverClient.exe	85
PID 1628 wrote to memory of 3468	1628	SilverClient.exe	87
PID 1628 wrote to memory of 3468	1628	SilverClient.exe	87
PID 1628 wrote to memory of 2252	1628	SilverClient.exe	101
PID 1628 wrote to memory of 2252	1628	SilverClient.exe	101
PID 2252 wrote to memory of 2784	2252	cmd.exe	103
PID 2252 wrote to memory of 2784	2252	cmd.exe	103
PID 2252 wrote to memory of 2780	2252	cmd.exe	104
PID 2252 wrote to memory of 2780	2252	cmd.exe	104
PID 2780 wrote to memory of 2544	2780	$77Ponispro.exe	107
PID 2780 wrote to memory of 2544	2780	$77Ponispro.exe	107
PID 2780 wrote to memory of 3652	2780	$77Ponispro.exe	109
PID 2780 wrote to memory of 3652	2780	$77Ponispro.exe	109
PID 2780 wrote to memory of 1240	2780	$77Ponispro.exe	111
PID 2780 wrote to memory of 1240	2780	$77Ponispro.exe	111
PID 2780 wrote to memory of 1864	2780	$77Ponispro.exe	113
PID 2780 wrote to memory of 1864	2780	$77Ponispro.exe	113
PID 2780 wrote to memory of 4848	2780	$77Ponispro.exe	114
PID 2780 wrote to memory of 4848	2780	$77Ponispro.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

evasion

Hidden Files and Directories

T1564.001

pid	Process
4652	attrib.exe
3468	attrib.exe

C:\Users\Admin\AppData\Local\Temp\SilverClient.exe
"C:\Users\Admin\AppData\Local\Temp\SilverClient.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1628
- C:\Windows\System32\attrib.exe
  "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\AppData\Roaming\system64"
  2⤵
  - Sets file to hidden
  - Views/modifies file attributes
  PID:4652
- C:\Windows\System32\attrib.exe
  "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\AppData\Roaming\system64\$77Ponispro.exe"
  2⤵
  - Sets file to hidden
  - Views/modifies file attributes
  PID:3468
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpBB61.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2252
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:2784
- - C:\Users\Admin\AppData\Roaming\system64\$77Ponispro.exe
    "C:\Users\Admin\AppData\Roaming\system64\$77Ponispro.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:2780
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks.exe" /query /TN $77Ponispro.exe
      4⤵
      PID:2544
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks.exe" /Create /SC ONCE /TN "$77Ponispro.exe" /TR "C:\Users\Admin\AppData\Roaming\system64\$77Ponispro.exe \"\$77Ponispro.exe\" /AsAdmin" /ST 00:01 /IT /F /RL HIGHEST
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:3652
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks.exe" /query /TN $77Ponispro.exe
      4⤵
      PID:1240
  - - 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:1864
  - - C:\Windows\System32\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /create /sc hourly /mo 1 /tn "Ponispro_Task-HOURLY-01" /tr "%MyFile%" /st 00:00
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:4848

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

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_okpcgpis.wn3.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpBB61.tmp.bat

Filesize
164B

MD5
c75ec9855a01d1864d662be5b20ddeba

SHA1
082d4eda516717402e8de2692c8fafedffb6a55a

SHA256
a084b1cb3de1427d55632b5b0211a5c25684e805d399d8821c060a9ddbeb9b93

SHA512
b549f651efac5b3dcb76b9ee685f44de817dd888c26f6e7fc8cfdac99c1b9f9e7d0d4ef204c093b3e27e4b05e92e175be06eb11e61cd8ff585922dc1f9a5a57a

Download Submit
C:\Users\Admin\AppData\Roaming\system64\$77Ponispro.exe

Filesize
43KB

MD5
79d47169908067917d7b01838e512d4e

SHA1
f9e4dbfad432da6bf68b72e60fed8b39b0465fdd

SHA256
7be0033e27b08c8e5f43200259ce3bfd1129b653789664c175342fb3fcb9405a

SHA512
f72a331379d8d595843b4515d96286871e4cfdc3c866c1cc0a6779a1e6b0b127cd2eea2615ab78f754b1c0fb0c51ed33ee02975945539f532ce597e5f68a875e

Download Submit
memory/1628-0-0x00007FFB67ED3000-0x00007FFB67ED5000-memory.dmp

Filesize
8KB

Download
memory/1628-1-0x0000000000ED0000-0x0000000000EE0000-memory.dmp

Filesize
64KB

Download
memory/1628-2-0x00007FFB67ED0000-0x00007FFB68991000-memory.dmp

Filesize
10.8MB

Download
memory/1628-3-0x00007FFB67ED3000-0x00007FFB67ED5000-memory.dmp

Filesize
8KB

Download
memory/1628-4-0x00007FFB67ED0000-0x00007FFB68991000-memory.dmp

Filesize
10.8MB

Download
memory/1628-10-0x00007FFB67ED0000-0x00007FFB68991000-memory.dmp

Filesize
10.8MB

Download
memory/1864-14-0x00000209CC800000-0x00000209CC822000-memory.dmp

Filesize
136KB

Download
memory/2780-26-0x00007FFB67EF3000-0x00007FFB67EF5000-memory.dmp

Filesize
8KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads