silverrat | ac8c2379cef34550f244e79d20d6c5d1b7f1e780712168536a06e64b692b8513

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

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
3260	attrib.exe
3544	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-1-5-21-940901362-3608833189-1915618603-1000\Control Panel\International\Geo\Nation	SilverClient.exe
Key value queried	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\Control Panel\International\Geo\Nation	$77Ponispro.exe

Executes dropped EXE 1 IoCs

pid	Process
1964	$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
4952	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
3464	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
4832	schtasks.exe
4192	schtasks.exe

Suspicious behavior: EnumeratesProcesses 26 IoCs

pid	Process
820	SilverClient.exe
820	SilverClient.exe
820	SilverClient.exe
820	SilverClient.exe
820	SilverClient.exe
820	SilverClient.exe
820	SilverClient.exe
820	SilverClient.exe
820	SilverClient.exe
820	SilverClient.exe
820	SilverClient.exe
820	SilverClient.exe
820	SilverClient.exe
820	SilverClient.exe
820	SilverClient.exe
820	SilverClient.exe
820	SilverClient.exe
820	SilverClient.exe
820	SilverClient.exe
820	SilverClient.exe
820	SilverClient.exe
820	SilverClient.exe
820	SilverClient.exe
1964	$77Ponispro.exe
4952	powershell.exe
4952	powershell.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	820	SilverClient.exe
Token: SeDebugPrivilege	1964	$77Ponispro.exe
Token: SeDebugPrivilege	4952	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1964	$77Ponispro.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 820 wrote to memory of 3260	820	SilverClient.exe	84
PID 820 wrote to memory of 3260	820	SilverClient.exe	84
PID 820 wrote to memory of 3544	820	SilverClient.exe	86
PID 820 wrote to memory of 3544	820	SilverClient.exe	86
PID 820 wrote to memory of 672	820	SilverClient.exe	101
PID 820 wrote to memory of 672	820	SilverClient.exe	101
PID 672 wrote to memory of 3464	672	cmd.exe	103
PID 672 wrote to memory of 3464	672	cmd.exe	103
PID 672 wrote to memory of 1964	672	cmd.exe	104
PID 672 wrote to memory of 1964	672	cmd.exe	104
PID 1964 wrote to memory of 4000	1964	$77Ponispro.exe	107
PID 1964 wrote to memory of 4000	1964	$77Ponispro.exe	107
PID 1964 wrote to memory of 4832	1964	$77Ponispro.exe	109
PID 1964 wrote to memory of 4832	1964	$77Ponispro.exe	109
PID 1964 wrote to memory of 4428	1964	$77Ponispro.exe	111
PID 1964 wrote to memory of 4428	1964	$77Ponispro.exe	111
PID 1964 wrote to memory of 4952	1964	$77Ponispro.exe	113
PID 1964 wrote to memory of 4952	1964	$77Ponispro.exe	113
PID 1964 wrote to memory of 4192	1964	$77Ponispro.exe	114
PID 1964 wrote to memory of 4192	1964	$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
3260	attrib.exe
3544	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:820
- 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:3260
- 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:3544
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpF86A.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:672
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:3464
- - 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:1964
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks.exe" /query /TN $77Ponispro.exe
      4⤵
      PID:4000
  - - 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:4832
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks.exe" /query /TN $77Ponispro.exe
      4⤵
      PID:4428
  - - 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:4952
  - - 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:4192

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_obtv0skv.ekd.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpF86A.tmp.bat

Filesize
164B

MD5
2fa9eaaedcb7e627497227b51d1bc689

SHA1
c5b451c293911ce71da985803b5b88d62cdafe8e

SHA256
3a5030ec1f2e28f11afff7421ad297769efc52334b481a10934f10f1d3ee2194

SHA512
50bc383efd3cb78041669df72bc7b3777feec24410f86ee92cf8b0cd35678232ef4234b570376314bc943acad3782729f2ef67b9671b688aac6c61c138a0477a

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

Filesize
43KB

MD5
77e52bd69cd31b84f909a737ebcb92cc

SHA1
c2ea68fc905a695f071e242b0782ef2996122a96

SHA256
ac8c2379cef34550f244e79d20d6c5d1b7f1e780712168536a06e64b692b8513

SHA512
6e0062f85604bb310730a2fbb87365d6543c92568561b5666af5f8939b325a464769c554751e149becd412862515c7a1e653ce07591094be1ddf2330d45a6b61

Download Submit
memory/820-10-0x00007FFFADF90000-0x00007FFFAEA51000-memory.dmp

Filesize
10.8MB

Download
memory/820-4-0x00007FFFADF90000-0x00007FFFAEA51000-memory.dmp

Filesize
10.8MB

Download
memory/820-3-0x00007FFFADF93000-0x00007FFFADF95000-memory.dmp

Filesize
8KB

Download
memory/820-0-0x00007FFFADF93000-0x00007FFFADF95000-memory.dmp

Filesize
8KB

Download
memory/820-2-0x00007FFFADF90000-0x00007FFFAEA51000-memory.dmp

Filesize
10.8MB

Download
memory/820-1-0x0000000000240000-0x0000000000250000-memory.dmp

Filesize
64KB

Download
memory/1964-14-0x00007FFFADF90000-0x00007FFFAEA51000-memory.dmp

Filesize
10.8MB

Download
memory/1964-29-0x00007FFFADF90000-0x00007FFFAEA51000-memory.dmp

Filesize
10.8MB

Download
memory/1964-30-0x000000001F570000-0x000000001F590000-memory.dmp

Filesize
128KB

Download
memory/1964-32-0x00007FFFADF90000-0x00007FFFAEA51000-memory.dmp

Filesize
10.8MB

Download
memory/4952-15-0x00000181649E0000-0x0000018164A02000-memory.dmp

Filesize
136KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads