silverrat | 6ccf17da9d1511886987f459d7524af6c195e853dff405ec211d9ae89163469c

General

Target

Silver.exe
Size

40KB
MD5

c99c7d1673abd0499e508de4c2445523
SHA1

e7333eb204147ac867cc06b597fb858fd29db2cc
SHA256

6ccf17da9d1511886987f459d7524af6c195e853dff405ec211d9ae89163469c
SHA512

62db95fe4f8ecb2da45afea01241886e6f97b3e9ad3b56ac5b1d8c0eea335a4dbf1c32d584ef844fb38e259625b330cde1a6cb63cf6b98c26098f9dcae97a3d1
SSDEEP

768:00sNbahnB/yoF3Yvz/DZM4snnnn71A+RUbB489ZYzb8hdB6Sc4xO:07RPL+Gt9ZYXooB4xO

Score

10^/10

silverrat evasion persistence trojan

Malware Config

Extracted

Family

silverrat

Version

1.0.0.0

C2

haffasdqa.duckdns.org:6070

Mutex

SilverMutex_ZAISHXAYQR

Attributes

certificate
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
decrypted_key
-|S.S.S|-
key
yy6zDjAUmbB09pKvo5Hhug==
key_x509
WmZhaWZHSlJEU1NHQ2lSQUdFck95dGxpQVVOd0lE
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
5008	attrib.exe
3620	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-1-5-21-2437139445-1151884604-3026847218-1000\Control Panel\International\Geo\Nation	Silver.exe

Executes dropped EXE 1 IoCs

pid	Process
1540	$77silver.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\\.cache\\$77silver.exe\""	Silver.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
1908	timeout.exe

Suspicious behavior: EnumeratesProcesses 24 IoCs

pid	Process
3528	Silver.exe
3528	Silver.exe
3528	Silver.exe
3528	Silver.exe
3528	Silver.exe
3528	Silver.exe
3528	Silver.exe
3528	Silver.exe
3528	Silver.exe
3528	Silver.exe
3528	Silver.exe
3528	Silver.exe
3528	Silver.exe
3528	Silver.exe
3528	Silver.exe
3528	Silver.exe
3528	Silver.exe
3528	Silver.exe
3528	Silver.exe
3528	Silver.exe
3528	Silver.exe
3528	Silver.exe
3528	Silver.exe
1540	$77silver.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3528	Silver.exe
Token: SeDebugPrivilege	1540	$77silver.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1540	$77silver.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 3528 wrote to memory of 5008	3528	Silver.exe	83
PID 3528 wrote to memory of 5008	3528	Silver.exe	83
PID 3528 wrote to memory of 3620	3528	Silver.exe	85
PID 3528 wrote to memory of 3620	3528	Silver.exe	85
PID 3528 wrote to memory of 4072	3528	Silver.exe	99
PID 3528 wrote to memory of 4072	3528	Silver.exe	99
PID 4072 wrote to memory of 1908	4072	cmd.exe	101
PID 4072 wrote to memory of 1908	4072	cmd.exe	101
PID 4072 wrote to memory of 1540	4072	cmd.exe	102
PID 4072 wrote to memory of 1540	4072	cmd.exe	102

Views/modifies file attributes 1 TTPs 2 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
5008	attrib.exe
3620	attrib.exe

C:\Users\Admin\AppData\Local\Temp\Silver.exe
"C:\Users\Admin\AppData\Local\Temp\Silver.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3528
- C:\Windows\System32\attrib.exe
  "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\AppData\Roaming\.cache"
  2⤵
  - Sets file to hidden
  - Views/modifies file attributes
  PID:5008
- C:\Windows\System32\attrib.exe
  "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\AppData\Roaming\.cache\$77silver.exe"
  2⤵
  - Sets file to hidden
  - Views/modifies file attributes
  PID:3620
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpC89F.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4072
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:1908
- - C:\Users\Admin\AppData\Roaming\.cache\$77silver.exe
    "C:\Users\Admin\AppData\Roaming\.cache\$77silver.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    PID:1540

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Hide Artifacts

2

T1564

Hidden Files and Directories

Modify Registry

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Temp\tmpC89F.tmp.bat

Filesize
160B

MD5
4a673ac50f04b11d312b16eceb6daa36

SHA1
2437621ad795e175f8a1e197a581dca0032c8261

SHA256
31dd7610ddfe57f59096c7f6d2bdbec17e955274a1d187ea66ed8a0ac444e4d0

SHA512
56b248516e8007a400ddd9c4d8dd4d7f444b2024599a9e28ee981c47fbc0d02a1b21ed95b2834ce5b666e802ca95533106395616171c1725190a52652814d014

Download Submit
C:\Users\Admin\AppData\Roaming\.cache\$77silver.exe

Filesize
40KB

MD5
c99c7d1673abd0499e508de4c2445523

SHA1
e7333eb204147ac867cc06b597fb858fd29db2cc

SHA256
6ccf17da9d1511886987f459d7524af6c195e853dff405ec211d9ae89163469c

SHA512
62db95fe4f8ecb2da45afea01241886e6f97b3e9ad3b56ac5b1d8c0eea335a4dbf1c32d584ef844fb38e259625b330cde1a6cb63cf6b98c26098f9dcae97a3d1

Download Submit
memory/1540-12-0x00007FFE10CB0000-0x00007FFE11771000-memory.dmp

Filesize
10.8MB

Download
memory/3528-0-0x00007FFE10CB3000-0x00007FFE10CB5000-memory.dmp

Filesize
8KB

Download
memory/3528-1-0x0000000000270000-0x000000000027E000-memory.dmp

Filesize
56KB

Download
memory/3528-2-0x00007FFE10CB0000-0x00007FFE11771000-memory.dmp

Filesize
10.8MB

Download
memory/3528-4-0x00007FFE10CB3000-0x00007FFE10CB5000-memory.dmp

Filesize
8KB

Download
memory/3528-5-0x00007FFE10CB0000-0x00007FFE11771000-memory.dmp

Filesize
10.8MB

Download
memory/3528-10-0x00007FFE10CB0000-0x00007FFE11771000-memory.dmp

Filesize
10.8MB

Download

Resubmissions

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads