silverrat | ac8c2379cef34550f244e79d20d6c5d1b7f1e780712168536a06e64b692b8513

Analysis

max time kernel
122s
max time network
123s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
30-11-2024 12:05

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General

Target

SilverClient.exe
Size

43KB
MD5

77e52bd69cd31b84f909a737ebcb92cc
SHA1

c2ea68fc905a695f071e242b0782ef2996122a96
SHA256

ac8c2379cef34550f244e79d20d6c5d1b7f1e780712168536a06e64b692b8513
SHA512

6e0062f85604bb310730a2fbb87365d6543c92568561b5666af5f8939b325a464769c554751e149becd412862515c7a1e653ce07591094be1ddf2330d45a6b61
SSDEEP

768:2uIQbKCHbymqTYV6O1i/MiZHFPsenEsJCSZbYvlGGooooizJj6RUT0v9SNHXhXBL:BIEKCtIO1nGFPsenEFWJj6GAv9iBor/Y

Score

10^/10

silverrat evasion execution persistence trojan

Malware Config

Extracted

Family

silverrat

Version

1.0.0.0

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
2508	attrib.exe
1920	attrib.exe

Executes dropped EXE 1 IoCs

pid	Process
2624	$77Ponispro.exe

Loads dropped DLL 1 IoCs

pid	Process
2240	cmd.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
3052	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
2632	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
2640	schtasks.exe
656	schtasks.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
3000	SilverClient.exe
3000	SilverClient.exe
3000	SilverClient.exe
2624	$77Ponispro.exe
3052	powershell.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	3000	SilverClient.exe
Token: SeDebugPrivilege	2624	$77Ponispro.exe
Token: SeDebugPrivilege	3052	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2624	$77Ponispro.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 3000 wrote to memory of 2508	3000	SilverClient.exe	30
PID 3000 wrote to memory of 2508	3000	SilverClient.exe	30
PID 3000 wrote to memory of 2508	3000	SilverClient.exe	30
PID 3000 wrote to memory of 1920	3000	SilverClient.exe	32
PID 3000 wrote to memory of 1920	3000	SilverClient.exe	32
PID 3000 wrote to memory of 1920	3000	SilverClient.exe	32
PID 3000 wrote to memory of 2240	3000	SilverClient.exe	35
PID 3000 wrote to memory of 2240	3000	SilverClient.exe	35
PID 3000 wrote to memory of 2240	3000	SilverClient.exe	35
PID 2240 wrote to memory of 2632	2240	cmd.exe	37
PID 2240 wrote to memory of 2632	2240	cmd.exe	37
PID 2240 wrote to memory of 2632	2240	cmd.exe	37
PID 2240 wrote to memory of 2624	2240	cmd.exe	38
PID 2240 wrote to memory of 2624	2240	cmd.exe	38
PID 2240 wrote to memory of 2624	2240	cmd.exe	38
PID 2624 wrote to memory of 2600	2624	$77Ponispro.exe	39
PID 2624 wrote to memory of 2600	2624	$77Ponispro.exe	39
PID 2624 wrote to memory of 2600	2624	$77Ponispro.exe	39
PID 2624 wrote to memory of 2640	2624	$77Ponispro.exe	41
PID 2624 wrote to memory of 2640	2624	$77Ponispro.exe	41
PID 2624 wrote to memory of 2640	2624	$77Ponispro.exe	41
PID 2624 wrote to memory of 2084	2624	$77Ponispro.exe	43
PID 2624 wrote to memory of 2084	2624	$77Ponispro.exe	43
PID 2624 wrote to memory of 2084	2624	$77Ponispro.exe	43
PID 2624 wrote to memory of 3052	2624	$77Ponispro.exe	45
PID 2624 wrote to memory of 3052	2624	$77Ponispro.exe	45
PID 2624 wrote to memory of 3052	2624	$77Ponispro.exe	45
PID 2624 wrote to memory of 656	2624	$77Ponispro.exe	47
PID 2624 wrote to memory of 656	2624	$77Ponispro.exe	47
PID 2624 wrote to memory of 656	2624	$77Ponispro.exe	47

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
2508	attrib.exe
1920	attrib.exe

C:\Users\Admin\AppData\Local\Temp\SilverClient.exe
"C:\Users\Admin\AppData\Local\Temp\SilverClient.exe"
1⤵
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3000
- 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:2508
- 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:1920
- C:\Windows\system32\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpFA75.tmp.bat""
  2⤵
  - Loads dropped DLL
  - Suspicious use of WriteProcessMemory
  PID:2240
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:2632
- - C:\Users\Admin\AppData\Roaming\system64\$77Ponispro.exe
    "C:\Users\Admin\AppData\Roaming\system64\$77Ponispro.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:2624
  - - C:\Windows\system32\schtasks.exe
      "schtasks.exe" /query /TN $77Ponispro.exe
      4⤵
      PID:2600
  - - 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:2640
  - - C:\Windows\system32\schtasks.exe
      "schtasks.exe" /query /TN $77Ponispro.exe
      4⤵
      PID:2084
  - - 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:3052
  - - 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:656

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Hide Artifacts

T1564

Hidden Files and Directories

T1564.001

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\Cab1518.tmp

Filesize
70KB

MD5
49aebf8cbd62d92ac215b2923fb1b9f5

SHA1
1723be06719828dda65ad804298d0431f6aff976

SHA256
b33efcb95235b98b48508e019afa4b7655e80cf071defabd8b2123fc8b29307f

SHA512
bf86116b015fb56709516d686e168e7c9c68365136231cc51d0b6542ae95323a71d2c7acec84aad7dcecc2e410843f6d82a0a6d51b9acfc721a9c84fdd877b5b

Download Submit
C:\Users\Admin\AppData\Local\Temp\TarB698.tmp

Filesize
181KB

MD5
4ea6026cf93ec6338144661bf1202cd1

SHA1
a1dec9044f750ad887935a01430bf49322fbdcb7

SHA256
8efbc21559ef8b1bcf526800d8070baad42474ce7198e26fa771dbb41a76b1d8

SHA512
6c7e0980e39aacf4c3689802353f464a08cd17753bd210ee997e5f2a455deb4f287a9ef74d84579dbde49bc96213cd2b8b247723919c412ea980aa6e6bfe218b

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpFA75.tmp.bat

Filesize
164B

MD5
076edfd05752f85438a4028e5d427e5a

SHA1
8c8ae6d6c4ff5f13a23511655030c9b7b2ee39e5

SHA256
efbca1ad5a7badd282996a8399af129db7e8b618632468f512fd154873478c01

SHA512
5061b3cbdb685d0c7ba428d0ec70a8648f9698efcf5d39ae94e8e17cd48ea63b6285e41f3612614d68350169af1dce7563fd7e8b5800c68d0eb42951c825b352

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

Filesize
43KB

MD5
77e52bd69cd31b84f909a737ebcb92cc

SHA1
c2ea68fc905a695f071e242b0782ef2996122a96

SHA256
ac8c2379cef34550f244e79d20d6c5d1b7f1e780712168536a06e64b692b8513

SHA512
6e0062f85604bb310730a2fbb87365d6543c92568561b5666af5f8939b325a464769c554751e149becd412862515c7a1e653ce07591094be1ddf2330d45a6b61

Download Submit
memory/2624-42-0x000000001B150000-0x000000001B170000-memory.dmp

Filesize
128KB

Download
memory/2624-19-0x000000013FAF0000-0x000000013FB00000-memory.dmp

Filesize
64KB

Download
memory/3000-14-0x000007FEF5100000-0x000007FEF5AEC000-memory.dmp

Filesize
9.9MB

Download
memory/3000-0-0x000007FEF5103000-0x000007FEF5104000-memory.dmp

Filesize
4KB

Download
memory/3000-4-0x000007FEF5100000-0x000007FEF5AEC000-memory.dmp

Filesize
9.9MB

Download
memory/3000-3-0x000007FEF5103000-0x000007FEF5104000-memory.dmp

Filesize
4KB

Download
memory/3000-2-0x000007FEF5100000-0x000007FEF5AEC000-memory.dmp

Filesize
9.9MB

Download
memory/3000-1-0x000000013FDC0000-0x000000013FDD0000-memory.dmp

Filesize
64KB

Download
memory/3052-24-0x000000001B740000-0x000000001BA22000-memory.dmp

Filesize
2.9MB

Download
memory/3052-25-0x0000000002770000-0x0000000002778000-memory.dmp

Filesize
32KB

Download