silverrat | c7c78f431c21c05d2963fb7635b73d969b7dada294252ef1d2b634b030a2375f

General

Target

Silly.exe
Size

45KB
MD5

1cf8d6e0acaa084d9b4201f11a1a04a8
SHA1

7cc576ff7a096e14a6e83836bfd3cd29f7164392
SHA256

c7c78f431c21c05d2963fb7635b73d969b7dada294252ef1d2b634b030a2375f
SHA512

de6889cffba397b9a95b02d3271b14c9abbe543fb2a4415182cb24e9a3cf152bfb1ae5d3237eacac613f411fc278d120191f45c5cb1c4ca5135f393b57c0527a
SSDEEP

768:iqzAMCV2799XtzcyyMjtjRULQD9PpnUz1QB6S9RVvr0/bE:iqzAM8qfzcMjGsD9K1QoyRVA/bE

Score

10^/10

silverrat defense_evasion execution persistence trojan

Malware Config

Extracted

Family

silverrat

Version

1.0.0.0

C2

if-eventually.gl.at.ply.gg:17094

Mutex

lAxDBRhAFu

Attributes

certificate
MIIE4DCCAsigAwIBAgIQAKQYOfZd86J2BfNjhG4CWTANBgkqhkiG9w0BAQ0FADARMQ8wDQYDVQQDDAZTaWx2ZXIwIBcNMjIwODI2MTkwMTA4WhgPOTk5OTEyMzEyMzU5NTlaMBExDzANBgNVBAMMBlNpbHZlcjCCAiIwDQYJKoZIhvcNAQEBBQADggIPADCCAgoCggIBAPbpOWfhZTuOfEaqqImTTe5dNHAAry7/mf00DCoI4lPZfypsc1tYraxSPFeayGu09a3qdhkWKSVIgwnu2n4GLQNOCY9fh/1oyrX4Iir3BIkYeU7pKTWgjhUlAmFAUAaNr0ca23Ku2kN79jrDzRznOgE2DEW4p7OiM4Mb097ma9lzu7MyssHbY4VCteAhj9HZiplqBxaC1vXDmzxqG+gUZ1aLcyG7ssdkOjtWVBgT3gD/gOl7KchRzCFB1egDC/vD9WZCG35U3Ngi+IkTznoXR1R06cq4v0UnGjE37R2vcB21qb0ZYNiZJXZHv5i9+R7xoPeNoLda5PqnfGGbhPvNEdD56mdcOKlzGIuyemLkUo8texdpiBWKbtc3JZf5VsKxjJtHDK3xW6gDGI+PAirzGkFPmwcf8WgsblvzLg8OZpVxVs8rmKWoi6qIrf4CXnyl73J4lgzW+ir7PjANAQXwLNGdNnvdMeLeo/muGQPdeNpr6OczGGnkWA4qniHeL51/Gx0a8A+jP9zKiyu+qHcsP2IotgWDH/KlzJVr7IAum+DV92uV8poTDcUNcHaKvhHA65KmEtsvLbK6lFZcAMC0eWC0VgpW44T1/16rOaaky5mP6rTMc3nSyOl/lU/XgAgGGQPe22bRLWYzd3WVeEpI1WnHYXS+tL9IOe4kJP+pYsWDAgMBAAGjMjAwMB0GA1UdDgQWBBR32TJj2LeUx9L+RcSOvmFV6VJq6TAPBgNVHRMBAf8EBTADAQH/MA0GCSqGSIb3DQEBDQUAA4ICAQA+qucSOi7ov7Q1FmAjMf925KuvKuCNwJiu3Sqo3FDGVAD1fAwAi2FdyuXEO2VIUPZCkalFcBna5rqyrc6tcS4T0IL2TsYLrsuGir7PWP7CAcft1urYS1HpNpHxeH/nixwnQaQs/MuRmdm2TeCj6G21P5BTW55U5y9sMPSYwhbD2N7XLgnSQd5Y+80TR7FUiye/k3D37fI9PRhSQGbfYFRQQTmxj84dPTnY5CVgaY9d8fNiFZkyjaZdf+mibK0xQTf+xLVVj+toDNCkc1F462TdmFhCrHd4PoMo0yLDNv4SC6NLRq4haWDRtORw6gd5GYIoCQ3m3oQvNlNxXhhIjsOyxkxOrkCD0c+57PIc7EmKXieJa/XxnkcIVxO8dvTY/vijuz/VaZYl/lPu9ckuqgJ1wRvvsHl70Trv4Mn4X5uCIqRFFlK/mSOZbLIguGkDN3QIZABvej89vlZMhrVfZOG2oawe23FskHjv7thF/WzOXtWw6RUVC1V+hCwbuxFNUjZmmOTUwdXHnus7I2AuiG6Jz1+y9aYiXBcVTdSljxjHRRmiRaAnY94h58vN8NJ4hKL2GVCo6LxkpuplmcntJN0cKraKTPxSXcCRrqWxX9qoIbfvBcUU4vH1jPJCCLNCuDyD3lgQkpPVvq0EMU1a2HFGgMEQMjpYpb38rcadDhT5ag==
decrypted_key
-|S.S.S|-
discord
https://discord.com/api/webhooks/1335679503938355221/lGcOUDspps04wapqxq013W8uYGPSCcmnxl9Q1xnWdBn45Ul8QBT-Qs2mjsdVNXfOtTCe
key
yy6zDjAUmbB09pKvo5Hhug==
key_x509
b0FGeVZNcFRMWVloVHR6Z0VESU5RdlpZUmxZbUFE
payload_url
https://g.top4top.io/p_2522c7w8u1.png
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.

defense_evasion

Hidden Files and Directories

T1564.001

pid	Process
1060	attrib.exe
1472	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-1-5-21-4089630652-1596403869-279772308-1000\Control Panel\International\Geo\Nation	Silly.exe
Key value queried	\REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000\Control Panel\International\Geo\Nation	$77Runtime Broker.exe

Executes dropped EXE 1 IoCs

pid	Process
3228	$77Runtime Broker.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\\Microsoft\\Windows\\Templates\\WinTask\\$77Runtime Broker.exe\""	Silly.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
972	powershell.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service

T1102

flow	ioc
21	discord.com
22	discord.com

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
3084	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
5040	schtasks.exe
3652	schtasks.exe

Suspicious behavior: EnumeratesProcesses 26 IoCs

pid	Process
3656	Silly.exe
3656	Silly.exe
3656	Silly.exe
3656	Silly.exe
3656	Silly.exe
3656	Silly.exe
3656	Silly.exe
3656	Silly.exe
3656	Silly.exe
3656	Silly.exe
3656	Silly.exe
3656	Silly.exe
3656	Silly.exe
3656	Silly.exe
3656	Silly.exe
3656	Silly.exe
3656	Silly.exe
3656	Silly.exe
3656	Silly.exe
3656	Silly.exe
3656	Silly.exe
3656	Silly.exe
3656	Silly.exe
972	powershell.exe
972	powershell.exe
3228	$77Runtime Broker.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeBackupPrivilege	432	vssvc.exe
Token: SeRestorePrivilege	432	vssvc.exe
Token: SeAuditPrivilege	432	vssvc.exe
Token: SeDebugPrivilege	3656	Silly.exe
Token: SeDebugPrivilege	3228	$77Runtime Broker.exe
Token: SeDebugPrivilege	972	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3228	$77Runtime Broker.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 3656 wrote to memory of 1060	3656	Silly.exe	86
PID 3656 wrote to memory of 1060	3656	Silly.exe	86
PID 3656 wrote to memory of 1472	3656	Silly.exe	88
PID 3656 wrote to memory of 1472	3656	Silly.exe	88
PID 3656 wrote to memory of 1396	3656	Silly.exe	96
PID 3656 wrote to memory of 1396	3656	Silly.exe	96
PID 1396 wrote to memory of 3084	1396	cmd.exe	98
PID 1396 wrote to memory of 3084	1396	cmd.exe	98
PID 1396 wrote to memory of 3228	1396	cmd.exe	99
PID 1396 wrote to memory of 3228	1396	cmd.exe	99
PID 3228 wrote to memory of 412	3228	$77Runtime Broker.exe	101
PID 3228 wrote to memory of 412	3228	$77Runtime Broker.exe	101
PID 3228 wrote to memory of 5040	3228	$77Runtime Broker.exe	103
PID 3228 wrote to memory of 5040	3228	$77Runtime Broker.exe	103
PID 3228 wrote to memory of 4876	3228	$77Runtime Broker.exe	105
PID 3228 wrote to memory of 4876	3228	$77Runtime Broker.exe	105
PID 3228 wrote to memory of 972	3228	$77Runtime Broker.exe	107
PID 3228 wrote to memory of 972	3228	$77Runtime Broker.exe	107
PID 3228 wrote to memory of 3652	3228	$77Runtime Broker.exe	108
PID 3228 wrote to memory of 3652	3228	$77Runtime Broker.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
Uses Volume Shadow Copy service COM API
The Volume Shadow Copy service is used to manage backups/snapshots.
ransomware

Views/modifies file attributes 1 TTPs 2 IoCs

defense_evasion

Hidden Files and Directories

T1564.001

pid	Process
1060	attrib.exe
1472	attrib.exe

C:\Users\Admin\AppData\Local\Temp\Silly.exe
"C:\Users\Admin\AppData\Local\Temp\Silly.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3656
- C:\Windows\System32\attrib.exe
  "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\WinTask"
  2⤵
  - Sets file to hidden
  - Views/modifies file attributes
  PID:1060
- C:\Windows\System32\attrib.exe
  "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\WinTask\$77Runtime Broker.exe"
  2⤵
  - Sets file to hidden
  - Views/modifies file attributes
  PID:1472
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpC5FF.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1396
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:3084
- - C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\WinTask\$77Runtime Broker.exe
    "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\WinTask\$77Runtime Broker.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:3228
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks.exe" /query /TN $77Runtime Broker.exe
      4⤵
      PID:412
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks.exe" /Create /SC ONCE /TN "$77Runtime Broker.exe" /TR "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\WinTask\$77Runtime Broker.exe \"\$77Runtime Broker.exe\" /AsAdmin" /ST 00:01 /IT /F /RL HIGHEST
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:5040
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks.exe" /query /TN $77Runtime Broker.exe
      4⤵
      PID:4876
  - - 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:972
  - - C:\Windows\System32\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /create /sc hourly /mo 1 /tn "Runtime Broker_Task-HOURLY-01" /tr "%MyFile%" /st 00:00
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:3652

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:432

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

Web Service

1

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_t5yovtwb.kol.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpC5FF.tmp.bat

Filesize
197B

MD5
729e3fedb2fc99c699e4586d09bc9dfc

SHA1
7058a1f0f3722c817f6ac45929c3d7bfed139c1e

SHA256
bee34b76990fc2574cc1df36ccd375283b714f705214f9392880f24aba9ebe16

SHA512
02140b22e838aa0cf5d74fe41586745e485c1237223a5b9d831dfcf79efab53dd693cc2b0c04647bd2c241b974dd6791d42a6604425d5c8fdee0654749a8edcb

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\WinTask\$77Runtime Broker.exe

Filesize
45KB

MD5
1cf8d6e0acaa084d9b4201f11a1a04a8

SHA1
7cc576ff7a096e14a6e83836bfd3cd29f7164392

SHA256
c7c78f431c21c05d2963fb7635b73d969b7dada294252ef1d2b634b030a2375f

SHA512
de6889cffba397b9a95b02d3271b14c9abbe543fb2a4415182cb24e9a3cf152bfb1ae5d3237eacac613f411fc278d120191f45c5cb1c4ca5135f393b57c0527a

Download Submit
memory/972-23-0x0000020EA3070000-0x0000020EA3092000-memory.dmp

Filesize
136KB

Download
memory/3656-0-0x00007FFF48353000-0x00007FFF48355000-memory.dmp

Filesize
8KB

Download
memory/3656-1-0x0000000000250000-0x0000000000260000-memory.dmp

Filesize
64KB

Download
memory/3656-2-0x00007FFF48350000-0x00007FFF48E11000-memory.dmp

Filesize
10.8MB

Download
memory/3656-3-0x00007FFF48353000-0x00007FFF48355000-memory.dmp

Filesize
8KB

Download
memory/3656-4-0x00007FFF48350000-0x00007FFF48E11000-memory.dmp

Filesize
10.8MB

Download
memory/3656-10-0x00007FFF48350000-0x00007FFF48E11000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads