silverrat | c6d5b9c5182ddaf0bd94891685737f05c98aa24450ca6f04510d895ab79d793b

General

Target

UnripSoft.exe
Size

43KB
MD5

6a988e8a2a732be5cc1035faa34c9c35
SHA1

eb17e390a33a14f0f1baa9c9cf0207c36ae1c879
SHA256

c6d5b9c5182ddaf0bd94891685737f05c98aa24450ca6f04510d895ab79d793b
SHA512

749dbbd429658bc5ff91d93fd0de2dfad0162cd2b7b287c845b71dec4369d8238b68a17aaf353e81ce2e1f5c3522a9386f2cd827c8b43ce7a276badb2eed05fb
SSDEEP

768:kWyceSek8A//Ol6IoZmMPHhm7ravCJ8eEPURULQD9PuGrz1QB6SR/lE:kWyceSeKYtqJmdZKUGsD9f/1Qoe/lE

Score

10^/10

silverrat defense_evasion execution persistence trojan

Malware Config

Extracted

Family

silverrat

Version

1.0.0.0

C2

american-designed.gl.at.ply.gg:50767

Mutex

lAxDBRhAFu

Attributes

certificate
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
decrypted_key
-|S.S.S|-
key
yy6zDjAUmbB09pKvo5Hhug==
key_x509
b0FGeVZNcFRMWVloVHR6Z0VESU5RdlpZUmxZbUFE
reconnect_delay
1
server_signature
t9H0tGywaq23QHywsvniYlva2DUEoHwEX4RZOKw6QYOUUUEs6+qPhkwL0ziJc2nYj2yd5E4o3kMJj8NRpRTkpZcyIg/ljsBjIY4uuTgySYNYShSJRrNgQc/XiUXjH546feRdpS3EuZPWH15iNA3U89kmdXU1BOtms28guz5MUZ/jdeGBHbjPJULpyM8EgGGdK3ajqJ+NWQxPHql47XGQFXqJ5PauE0xmpcMKt+LU7fe+NS0Yx11uv+tRwSlMmFhYU9pSYoS8zZ7Lyeaw8rcxs06oecNxLKcmbSH3H5QWo4qYq/Y7HAeBmLEHHB5t8+bCVeDMfccmct8s+aZpljSceGlri2HJsxEjZ7FYmh4+o8bhacTmqQyE99P1kSa4FAWPLn59j5s1nO91Sb/rMvcNUApgatm6ZRZjc+Ninv7rXwFncnT7eRSRvldp7PohX6bsJEJRMnfLT4YxM0TzqV9POSK0hjrRojbiRQWahccxQRKfg3TcVxNnNjCQWMOJ0YzNuQ0ZSTLPO3QA4v/0cwD5nBhPdhowAnMUb4j61HsPdaQnKXvlx377vbMOowWJFqGC1ES1rKn843GMu81HL7FJsfrpqglmmFTddG3IwkeJU7umxj41+anidgCco7Jzbii9D9e4l2DF3EuhYg+qIuiwNw4ACh3olxSGStXl952V/dY=

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
3880	attrib.exe
208	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-1-5-21-2593460650-190333679-3676257533-1000\Control Panel\International\Geo\Nation	UnripSoft.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2593460650-190333679-3676257533-1000\Control Panel\International\Geo\Nation	$77svshost.exe.exe

Executes dropped EXE 1 IoCs

pid	Process
4824	$77svshost.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\\sysreqses\\$77svshost.exe.exe\""	UnripSoft.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
3564	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

defense_evasion

pid	Process
3592	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
4484	schtasks.exe
4296	schtasks.exe

Suspicious behavior: EnumeratesProcesses 27 IoCs

pid	Process
60	UnripSoft.exe
60	UnripSoft.exe
60	UnripSoft.exe
60	UnripSoft.exe
60	UnripSoft.exe
60	UnripSoft.exe
60	UnripSoft.exe
60	UnripSoft.exe
60	UnripSoft.exe
60	UnripSoft.exe
60	UnripSoft.exe
60	UnripSoft.exe
60	UnripSoft.exe
60	UnripSoft.exe
60	UnripSoft.exe
60	UnripSoft.exe
60	UnripSoft.exe
60	UnripSoft.exe
60	UnripSoft.exe
60	UnripSoft.exe
60	UnripSoft.exe
60	UnripSoft.exe
60	UnripSoft.exe
4824	$77svshost.exe.exe
3564	powershell.exe
3564	powershell.exe
3564	powershell.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeBackupPrivilege	5016	vssvc.exe
Token: SeRestorePrivilege	5016	vssvc.exe
Token: SeAuditPrivilege	5016	vssvc.exe
Token: SeDebugPrivilege	60	UnripSoft.exe
Token: SeDebugPrivilege	4824	$77svshost.exe.exe
Token: SeDebugPrivilege	3564	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4824	$77svshost.exe.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 60 wrote to memory of 3880	60	UnripSoft.exe	91
PID 60 wrote to memory of 3880	60	UnripSoft.exe	91
PID 60 wrote to memory of 208	60	UnripSoft.exe	93
PID 60 wrote to memory of 208	60	UnripSoft.exe	93
PID 60 wrote to memory of 2932	60	UnripSoft.exe	102
PID 60 wrote to memory of 2932	60	UnripSoft.exe	102
PID 2932 wrote to memory of 3592	2932	cmd.exe	104
PID 2932 wrote to memory of 3592	2932	cmd.exe	104
PID 2932 wrote to memory of 4824	2932	cmd.exe	105
PID 2932 wrote to memory of 4824	2932	cmd.exe	105
PID 4824 wrote to memory of 4328	4824	$77svshost.exe.exe	107
PID 4824 wrote to memory of 4328	4824	$77svshost.exe.exe	107
PID 4824 wrote to memory of 4296	4824	$77svshost.exe.exe	109
PID 4824 wrote to memory of 4296	4824	$77svshost.exe.exe	109
PID 4824 wrote to memory of 648	4824	$77svshost.exe.exe	111
PID 4824 wrote to memory of 648	4824	$77svshost.exe.exe	111
PID 4824 wrote to memory of 3564	4824	$77svshost.exe.exe	113
PID 4824 wrote to memory of 3564	4824	$77svshost.exe.exe	113
PID 4824 wrote to memory of 4484	4824	$77svshost.exe.exe	114
PID 4824 wrote to memory of 4484	4824	$77svshost.exe.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
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
3880	attrib.exe
208	attrib.exe

C:\Users\Admin\AppData\Local\Temp\UnripSoft.exe
"C:\Users\Admin\AppData\Local\Temp\UnripSoft.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:60
- C:\Windows\System32\attrib.exe
  "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\sysreqses"
  2⤵
  - Sets file to hidden
  - Views/modifies file attributes
  PID:3880
- C:\Windows\System32\attrib.exe
  "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\sysreqses\$77svshost.exe.exe"
  2⤵
  - Sets file to hidden
  - Views/modifies file attributes
  PID:208
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpC4D6.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2932
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:3592
- - C:\Users\Admin\sysreqses\$77svshost.exe.exe
    "C:\Users\Admin\sysreqses\$77svshost.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:4824
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks.exe" /query /TN $77svshost.exe.exe
      4⤵
      PID:4328
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks.exe" /Create /SC ONCE /TN "$77svshost.exe.exe" /TR "C:\Users\Admin\sysreqses\$77svshost.exe.exe \"\$77svshost.exe.exe\" /AsAdmin" /ST 00:01 /IT /F /RL HIGHEST
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:4296
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks.exe" /query /TN $77svshost.exe.exe
      4⤵
      PID:648
  - - 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:3564
  - - C:\Windows\System32\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /create /sc hourly /mo 1 /tn "svshost.exe_Task-HOURLY-01" /tr "%MyFile%" /st 00:00
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:4484

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:5016

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_leb4jtsd.4yo.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpC4D6.tmp.bat

Filesize
152B

MD5
84c8044a920126b16322d02dfeb93e15

SHA1
3bafd6652ed7a945cebb656dd1d4a4c86f537705

SHA256
efb1504d595a32bbe6254f1e8a59176e04614868903db028d1471eb58fa1cea8

SHA512
e7f1264148995c25732eacbe68ba5be239fb69da7938894e11a2d3e0c6dd17f7f08db62ac4a6996b8d5dbb0b66954c324aa808132d555d4e0ecad042455bab7a

Download Submit
C:\Users\Admin\sysreqses\$77svshost.exe.exe

Filesize
43KB

MD5
6a988e8a2a732be5cc1035faa34c9c35

SHA1
eb17e390a33a14f0f1baa9c9cf0207c36ae1c879

SHA256
c6d5b9c5182ddaf0bd94891685737f05c98aa24450ca6f04510d895ab79d793b

SHA512
749dbbd429658bc5ff91d93fd0de2dfad0162cd2b7b287c845b71dec4369d8238b68a17aaf353e81ce2e1f5c3522a9386f2cd827c8b43ce7a276badb2eed05fb

Download Submit
memory/60-0-0x00007FFCFC873000-0x00007FFCFC875000-memory.dmp

Filesize
8KB

Download
memory/60-1-0x00000000008F0000-0x0000000000900000-memory.dmp

Filesize
64KB

Download
memory/60-2-0x00007FFCFC870000-0x00007FFCFD331000-memory.dmp

Filesize
10.8MB

Download
memory/60-3-0x00007FFCFC873000-0x00007FFCFC875000-memory.dmp

Filesize
8KB

Download
memory/60-4-0x00007FFCFC870000-0x00007FFCFD331000-memory.dmp

Filesize
10.8MB

Download
memory/60-10-0x00007FFCFC870000-0x00007FFCFD331000-memory.dmp

Filesize
10.8MB

Download
memory/3564-14-0x0000027CB8C30000-0x0000027CB8C52000-memory.dmp

Filesize
136KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads