silverrat | edc876045d945c73f2746b87e8aa73415026f6771c114320fefdc5e73828faea

General

Target

System.Runtime.exe
Size

134KB
MD5

e7621d95185c721aa9e1002703b82fb1
SHA1

187d8a5a6d5244b981e523cce95081055e59150e
SHA256

edc876045d945c73f2746b87e8aa73415026f6771c114320fefdc5e73828faea
SHA512

f2438061ee21db1fd3d82ffbd4064ca1b6c8574d637441f728c5133918b44948647953b91c25795ad0056f74e6f6e15d6349244b122940c6c977a6946fbf0137
SSDEEP

1536:9gAlZHY+5D5YEtSMxuJyxq7J7BmfRNULyvUrTd0E8pXOAIT/Rk0MEMxNGJVuFjvy:9hXYRI3KBms7dwpXOAoRLEfGnDwcPlgY

Score

10^/10

silverrat defense_evasion discovery 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|-
key
yy6zDjAUmbB09pKvo5Hhug==
key_x509
b0FGeVZNcFRMWVloVHR6Z0VESU5RdlpZUmxZbUFE
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
4512	attrib.exe
4620	attrib.exe

Checks computer location settings 2 TTPs 1 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-1-5-21-1627638211-811279536-2205736159-1000\Control Panel\International\Geo\Nation	System.Runtime.exe

Executes dropped EXE 1 IoCs

pid	Process
1764	System.Runtime.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 1 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	System.Runtime.exe

Suspicious behavior: EnumeratesProcesses 19 IoCs

pid	Process
1764	System.Runtime.exe
1764	System.Runtime.exe
1764	System.Runtime.exe
1764	System.Runtime.exe
1764	System.Runtime.exe
1764	System.Runtime.exe
1764	System.Runtime.exe
1764	System.Runtime.exe
1764	System.Runtime.exe
1764	System.Runtime.exe
1764	System.Runtime.exe
1764	System.Runtime.exe
1764	System.Runtime.exe
1764	System.Runtime.exe
1764	System.Runtime.exe
1764	System.Runtime.exe
1764	System.Runtime.exe
1764	System.Runtime.exe
1764	System.Runtime.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeBackupPrivilege	5608	vssvc.exe
Token: SeRestorePrivilege	5608	vssvc.exe
Token: SeAuditPrivilege	5608	vssvc.exe
Token: SeDebugPrivilege	1764	System.Runtime.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4268 wrote to memory of 1764	4268	System.Runtime.exe	85
PID 4268 wrote to memory of 1764	4268	System.Runtime.exe	85
PID 1764 wrote to memory of 4512	1764	System.Runtime.exe	90
PID 1764 wrote to memory of 4512	1764	System.Runtime.exe	90
PID 1764 wrote to memory of 4620	1764	System.Runtime.exe	92
PID 1764 wrote to memory of 4620	1764	System.Runtime.exe	92

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
4512	attrib.exe
4620	attrib.exe

C:\Users\Admin\AppData\Local\Temp\System.Runtime.exe
"C:\Users\Admin\AppData\Local\Temp\System.Runtime.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4268
- C:\Users\Admin\AppData\Local\Microsoft\Windows\Security\{FEF10DED-355E-4e06-9381-9B24D7F7CC88}.{2559a1f2-21d7-11d4-bdaf-00c04f60b9f0}\System.Runtime.exe
  C:\Users\Admin\AppData\Local\Microsoft\Windows\Security\{FEF10DED-355E-4e06-9381-9B24D7F7CC88}.{2559a1f2-21d7-11d4-bdaf-00c04f60b9f0}\System.Runtime.exe
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1764
- - C:\Windows\System32\attrib.exe
    "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\WinTask"
    3⤵
    - Sets file to hidden
    - Views/modifies file attributes
    PID:4512
- - C:\Windows\System32\attrib.exe
    "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\WinTask\$77Runtime Broker.exe"
    3⤵
    - Sets file to hidden
    - Views/modifies file attributes
    PID:4620

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:5608

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Hide Artifacts

2

T1564

Hidden Files and Directories

2

T1564.001

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\Windows\Security\{FEF10DED-355E-4e06-9381-9B24D7F7CC88}.{2559a1f2-21d7-11d4-bdaf-00c04f60b9f0}\System.Runtime.exe

Filesize
43KB

MD5
3c7e3574e6e56d2e7a2e2c2f78555491

SHA1
cef927a96eeb7055e13d720be16773ac2407038e

SHA256
7a30e605cf7a26c63af96185710452c1ec812849a0366f6a008f0dcde815c156

SHA512
8d729a9853bc88f20902a79ca4cabb3d7f69ce1fd8335e0f82c6fb1ec3f6a3141f308c6d341f785a4b72fe053c6a0d0804b22893c40d6de66236dbdea9a53b4e

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\Security\{FEFl0DED-355E-4e06-93Bl-9B24D7F7CC88}.{2559a1f2-21d7-11d4-bdaf-00c04f60b9f0}\System.Runtime.exe

Filesize
43KB

MD5
eda12f565de784f92e5da5179bee6d26

SHA1
ae24f45b65a858604a9562eb0fcdf244e87744bd

SHA256
535d712f97deb16cbf71dfe80e91890410244bb71e3e48ef33a941eb9f89ae6c

SHA512
a75bf53ad2740fe0230b1c9b50985bd64f72ea3abd5b077dc6d0096dfbee8b2ab95019832826eff0825979ba8a82c433290307c8945e23efb9881f766cafdaba

Download Submit
memory/1764-33-0x00007FFDFB203000-0x00007FFDFB205000-memory.dmp

Filesize
8KB

Download
memory/1764-34-0x0000000000F30000-0x0000000000F42000-memory.dmp

Filesize
72KB

Download
memory/1764-35-0x00007FFDFB200000-0x00007FFDFBCC1000-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