silverrat | 632afc11c1652f563a31015c766ce4d8f0d7ea34a5668511e7c08113e657cd3d

General

Target

SilverClient.exe
Size

43KB
MD5

7ca038b550ee364bc39ba3ebbfc0fb0e
SHA1

45969aca7d7850aa2fd1b1c3c03a65919effb899
SHA256

632afc11c1652f563a31015c766ce4d8f0d7ea34a5668511e7c08113e657cd3d
SHA512

c4d6b8aeb3397245591f2453ec0f4e55fd5333cb14b0c0fc82d0843cca925236a1143d52705cf2988580901e7bf122dc8c197da28c436fde633c244c127624c5
SSDEEP

768:JZiylKt1aCmWgYV6OZi/MiZHFPsxnEsJCSZbYvlGGooooizJjwRUT0v9S9HbExhI:JZigKtFIOZvGFPsxnEFWJjwGAv9KbExy

Score

10^/10

silverrat evasion execution persistence trojan

Malware Config

Extracted

Family

silverrat

Version

1.0.0.0

C2

speed-janet.gl.at.ply.gg:2217

Mutex

SilverMutex_pJwESYkGuV

Attributes

certificate
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
decrypted_key
-|S.S.S|-
key
yy6zDjAUmbB09pKvo5Hhug==
key_x509
UXF3ckpSV0ZzZnhEVFJ3b2FDUkZJSm5UamFDcUVR
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
396	attrib.exe
212	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-1-5-21-2878641211-696417878-3864914810-1000\Control Panel\International\Geo\Nation	SilverClient.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000\Control Panel\International\Geo\Nation	$77SecurityHealthSystray.exe.exe

Executes dropped EXE 1 IoCs

pid	Process
5024	$77SecurityHealthSystray.exe.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\\root\\$77SecurityHealthSystray.exe.exe\""	SilverClient.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
3532	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
5064	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
4176	schtasks.exe
2592	schtasks.exe

Suspicious behavior: EnumeratesProcesses 26 IoCs

pid	Process
2268	SilverClient.exe
2268	SilverClient.exe
2268	SilverClient.exe
2268	SilverClient.exe
2268	SilverClient.exe
2268	SilverClient.exe
2268	SilverClient.exe
2268	SilverClient.exe
2268	SilverClient.exe
2268	SilverClient.exe
2268	SilverClient.exe
2268	SilverClient.exe
2268	SilverClient.exe
2268	SilverClient.exe
2268	SilverClient.exe
2268	SilverClient.exe
2268	SilverClient.exe
2268	SilverClient.exe
2268	SilverClient.exe
2268	SilverClient.exe
2268	SilverClient.exe
2268	SilverClient.exe
2268	SilverClient.exe
5024	$77SecurityHealthSystray.exe.exe
3532	powershell.exe
3532	powershell.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	2268	SilverClient.exe
Token: SeDebugPrivilege	5024	$77SecurityHealthSystray.exe.exe
Token: SeDebugPrivilege	3532	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
5024	$77SecurityHealthSystray.exe.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 2268 wrote to memory of 396	2268	SilverClient.exe	83
PID 2268 wrote to memory of 396	2268	SilverClient.exe	83
PID 2268 wrote to memory of 212	2268	SilverClient.exe	85
PID 2268 wrote to memory of 212	2268	SilverClient.exe	85
PID 2268 wrote to memory of 2284	2268	SilverClient.exe	96
PID 2268 wrote to memory of 2284	2268	SilverClient.exe	96
PID 2284 wrote to memory of 5064	2284	cmd.exe	98
PID 2284 wrote to memory of 5064	2284	cmd.exe	98
PID 2284 wrote to memory of 5024	2284	cmd.exe	103
PID 2284 wrote to memory of 5024	2284	cmd.exe	103
PID 5024 wrote to memory of 2860	5024	$77SecurityHealthSystray.exe.exe	104
PID 5024 wrote to memory of 2860	5024	$77SecurityHealthSystray.exe.exe	104
PID 5024 wrote to memory of 4176	5024	$77SecurityHealthSystray.exe.exe	106
PID 5024 wrote to memory of 4176	5024	$77SecurityHealthSystray.exe.exe	106
PID 5024 wrote to memory of 3120	5024	$77SecurityHealthSystray.exe.exe	108
PID 5024 wrote to memory of 3120	5024	$77SecurityHealthSystray.exe.exe	108
PID 5024 wrote to memory of 3532	5024	$77SecurityHealthSystray.exe.exe	110
PID 5024 wrote to memory of 3532	5024	$77SecurityHealthSystray.exe.exe	110
PID 5024 wrote to memory of 2592	5024	$77SecurityHealthSystray.exe.exe	111
PID 5024 wrote to memory of 2592	5024	$77SecurityHealthSystray.exe.exe	111

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
396	attrib.exe
212	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:2268
- C:\Windows\System32\attrib.exe
  "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\root"
  2⤵
  - Sets file to hidden
  - Views/modifies file attributes
  PID:396
- C:\Windows\System32\attrib.exe
  "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\root\$77SecurityHealthSystray.exe.exe"
  2⤵
  - Sets file to hidden
  - Views/modifies file attributes
  PID:212
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpFBD5.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2284
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:5064
- - C:\Users\Admin\root\$77SecurityHealthSystray.exe.exe
    "C:\Users\Admin\root\$77SecurityHealthSystray.exe.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:5024
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks.exe" /query /TN $77SecurityHealthSystray.exe.exe
      4⤵
      PID:2860
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks.exe" /Create /SC ONCE /TN "$77SecurityHealthSystray.exe.exe" /TR "C:\Users\Admin\root\$77SecurityHealthSystray.exe.exe \"\$77SecurityHealthSystray.exe.exe\" /AsAdmin" /ST 00:01 /IT /F /RL HIGHEST
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:4176
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks.exe" /query /TN $77SecurityHealthSystray.exe.exe
      4⤵
      PID:3120
  - - 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:3532
  - - C:\Windows\System32\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /create /sc hourly /mo 1 /tn "SecurityHealthSystray.exe_Task-HOURLY-01" /tr "%MyFile%" /st 00:00
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:2592

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

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_r3phffty.kbx.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpFBD5.tmp.bat

Filesize
161B

MD5
75cd7b2875428fa3f56e6b96f451f51c

SHA1
d44805e63a03e88c0011e42ec7fc401e6183c5e9

SHA256
64eb4c7b9fdb2e2a5802c69e840fabe7ac23350fb8070ab6ff30239b278390bd

SHA512
1ed6c4bc97d581bd656700f0d9f81a938ffcfd55e8c864fc1490593546c9cfdfd89c09e73b64fccb6a37f3f7176bac72ab8e30992d02263e914095e70fc68895

Download Submit
C:\Users\Admin\root\$77SecurityHealthSystray.exe.exe

Filesize
43KB

MD5
7ca038b550ee364bc39ba3ebbfc0fb0e

SHA1
45969aca7d7850aa2fd1b1c3c03a65919effb899

SHA256
632afc11c1652f563a31015c766ce4d8f0d7ea34a5668511e7c08113e657cd3d

SHA512
c4d6b8aeb3397245591f2453ec0f4e55fd5333cb14b0c0fc82d0843cca925236a1143d52705cf2988580901e7bf122dc8c197da28c436fde633c244c127624c5

Download Submit
memory/2268-1-0x00007FFF75D53000-0x00007FFF75D55000-memory.dmp

Filesize
8KB

Download
memory/2268-0-0x00000000000C0000-0x00000000000D0000-memory.dmp

Filesize
64KB

Download
memory/2268-2-0x00007FFF75D50000-0x00007FFF76811000-memory.dmp

Filesize
10.8MB

Download
memory/2268-3-0x00007FFF75D53000-0x00007FFF75D55000-memory.dmp

Filesize
8KB

Download
memory/2268-4-0x00007FFF75D50000-0x00007FFF76811000-memory.dmp

Filesize
10.8MB

Download
memory/2268-10-0x00007FFF75D50000-0x00007FFF76811000-memory.dmp

Filesize
10.8MB

Download
memory/3532-20-0x00000184F0620000-0x00000184F0642000-memory.dmp

Filesize
136KB

Download
memory/5024-14-0x00007FFF75D50000-0x00007FFF76811000-memory.dmp

Filesize
10.8MB

Download
memory/5024-27-0x00007FFF75D50000-0x00007FFF76811000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads