| File name: | AsyncClient.exe |
| Full analysis: | https://app.any.run/tasks/8327c0a4-46ef-4dc3-a955-876b5ff81e0f |
| Verdict: | Malicious activity |
| Threats: | AsyncRAT is a RAT that can monitor and remotely control infected systems. This malware was introduced on Github as a legitimate open-source remote administration software, but hackers use it for its many powerful malicious functions. |
| Analysis date: | January 24, 2022, 21:33:40 |
| OS: | Windows 7 Professional Service Pack 1 (build: 7601, 32 bit) |
| Tags: | |
| Indicators: | |
| MIME: | application/x-dosexec |
| File info: | PE32 executable (GUI) Intel 80386 Mono/.Net assembly, for MS Windows |
| MD5: | 326D2DC0B6DF146324A510773D5EAA85 |
| SHA1: | B9AEA0263F6AFF15DB1A35D295C269497F4C5C32 |
| SHA256: | 920F4DDF419FB6EEAA0AD0336ACE2C986E8A523AE8A6776023AB746DC6C4DFD5 |
| SSDEEP: | 768:2uY49T3kH1jWUvmqRmo2qbiZu/8hPIPO0CjMCM0bVjnrpl743RxUHK2TenS48BD0:2uY49T34l2JcBPOl7bVHvs3RxUH7SnSE |
MALICIOUS
Changes the autorun value in the registry
- AsyncClient.exe (PID: 1988)
ASYNCRAT was detected
- svchost.exe (PID: 2148)
SUSPICIOUS
Checks supported languages
- AsyncClient.exe (PID: 1988)
- cmd.exe (PID: 2228)
- svchost.exe (PID: 2148)
Reads the computer name
- AsyncClient.exe (PID: 1988)
- svchost.exe (PID: 2148)
Executable content was dropped or overwritten
- AsyncClient.exe (PID: 1988)
Reads Environment values
- svchost.exe (PID: 2148)
Starts CMD.EXE for commands execution
- AsyncClient.exe (PID: 1988)
Creates executable files which already exist in Windows
- AsyncClient.exe (PID: 1988)
INFO
Checks supported languages
- timeout.exe (PID: 2480)
Reads settings of System Certificates
- svchost.exe (PID: 2148)
Find more information about signature artifacts and mapping to MITRE ATT&CK™ MATRIX at the full report
TRiD
| .exe | | | Generic CIL Executable (.NET, Mono, etc.) (82.9) |
|---|---|---|
| .dll | | | Win32 Dynamic Link Library (generic) (7.4) |
| .exe | | | Win32 Executable (generic) (5.1) |
| .exe | | | Generic Win/DOS Executable (2.2) |
| .exe | | | DOS Executable Generic (2.2) |
EXIF
EXE
| AssemblyVersion: | 1.0.0.0 |
|---|---|
| ProductVersion: | 1.0.0.0 |
| ProductName: | - |
| OriginalFileName: | Stub.exe |
| LegalTrademarks: | - |
| LegalCopyright: | - |
| InternalName: | Stub.exe |
| FileVersion: | 1.0.0.0 |
| FileDescription: | - |
| CompanyName: | - |
| Comments: | - |
| CharacterSet: | Unicode |
| LanguageCode: | Neutral |
| FileSubtype: | - |
| ObjectFileType: | Executable application |
| FileOS: | Win32 |
| FileFlags: | (none) |
| FileFlagsMask: | 0x003f |
| ProductVersionNumber: | 1.0.0.0 |
| FileVersionNumber: | 1.0.0.0 |
| Subsystem: | Windows GUI |
| SubsystemVersion: | 4 |
| ImageVersion: | - |
| OSVersion: | 4 |
| EntryPoint: | 0xd0ae |
| UninitializedDataSize: | - |
| InitializedDataSize: | 2560 |
| CodeSize: | 45568 |
| LinkerVersion: | 8 |
| PEType: | PE32 |
| TimeStamp: | 2020:05:10 07:24:51+02:00 |
| MachineType: | Intel 386 or later, and compatibles |
Summary
| Architecture: | IMAGE_FILE_MACHINE_I386 |
|---|---|
| Subsystem: | IMAGE_SUBSYSTEM_WINDOWS_GUI |
| Compilation Date: | 10-May-2020 05:24:51 |
| Comments: | - |
| CompanyName: | - |
| FileDescription: | - |
| FileVersion: | 1.0.0.0 |
| InternalName: | Stub.exe |
| LegalCopyright: | - |
| LegalTrademarks: | - |
| OriginalFilename: | Stub.exe |
| ProductName: | - |
| ProductVersion: | 1.0.0.0 |
| Assembly Version: | 1.0.0.0 |
DOS Header
| Magic number: | MZ |
|---|---|
| Bytes on last page of file: | 0x0090 |
| Pages in file: | 0x0003 |
| Relocations: | 0x0000 |
| Size of header: | 0x0004 |
| Min extra paragraphs: | 0x0000 |
| Max extra paragraphs: | 0xFFFF |
| Initial SS value: | 0x0000 |
| Initial SP value: | 0x00B8 |
| Checksum: | 0x0000 |
| Initial IP value: | 0x0000 |
| Initial CS value: | 0x0000 |
| Overlay number: | 0x0000 |
| OEM identifier: | 0x0000 |
| OEM information: | 0x0000 |
| Address of NE header: | 0x00000080 |
PE Headers
| Signature: | PE |
|---|---|
| Machine: | IMAGE_FILE_MACHINE_I386 |
| Number of sections: | 3 |
| Time date stamp: | 10-May-2020 05:24:51 |
| Pointer to Symbol Table: | 0x00000000 |
| Number of symbols: | 0 |
| Size of Optional Header: | 0x00E0 |
| Characteristics: |
|
Sections
Name | Virtual Address | Virtual Size | Raw Size | Charateristics | Entropy |
|---|---|---|---|---|---|
.text | 0x00002000 | 0x0000B0B4 | 0x0000B200 | IMAGE_SCN_CNT_CODE, IMAGE_SCN_MEM_EXECUTE, IMAGE_SCN_MEM_READ | 5.62391 |
.rsrc | 0x0000E000 | 0x000007FF | 0x00000800 | IMAGE_SCN_CNT_INITIALIZED_DATA, IMAGE_SCN_MEM_READ | 4.88507 |
.reloc | 0x00010000 | 0x0000000C | 0x00000200 | IMAGE_SCN_CNT_INITIALIZED_DATA, IMAGE_SCN_MEM_DISCARDABLE, IMAGE_SCN_MEM_READ | 0.0815394 |
Resources
Title | Entropy | Size | Codepage | Language | Type |
|---|---|---|---|---|---|
1 | 5.22615 | 1171 | UNKNOWN | UNKNOWN | RT_MANIFEST |
Imports
mscoree.dll |
Total processes
39
Monitored processes
4
Malicious processes
2
Suspicious processes
0
Behavior graph
Click at the process to see the details
Process information
PID | CMD | Path | Indicators | Parent process | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1988 | "C:\Users\admin\AppData\Local\Temp\AsyncClient.exe" | C:\Users\admin\AppData\Local\Temp\AsyncClient.exe | Explorer.EXE | ||||||||||||
User: admin Integrity Level: MEDIUM Exit code: 0 Version: 1.0.0.0 Modules
| |||||||||||||||
| 2148 | "C:\Users\admin\AppData\Local\Temp\svchost.exe" | C:\Users\admin\AppData\Local\Temp\svchost.exe | cmd.exe | ||||||||||||
User: admin Integrity Level: MEDIUM Exit code: 0 Version: 1.0.0.0 Modules
| |||||||||||||||
| 2228 | C:\Windows\system32\cmd.exe /c ""C:\Users\admin\AppData\Local\Temp\tmpFD6E.tmp.bat"" | C:\Windows\system32\cmd.exe | — | AsyncClient.exe | |||||||||||
User: admin Company: Microsoft Corporation Integrity Level: MEDIUM Description: Windows Command Processor Exit code: 1 Version: 6.1.7601.17514 (win7sp1_rtm.101119-1850) Modules
| |||||||||||||||
| 2480 | timeout 3 | C:\Windows\system32\timeout.exe | — | cmd.exe | |||||||||||
User: admin Company: Microsoft Corporation Integrity Level: MEDIUM Description: timeout - pauses command processing Exit code: 0 Version: 6.1.7600.16385 (win7_rtm.090713-1255) Modules
| |||||||||||||||
Total events
4 666
Read events
4 637
Write events
29
Delete events
0
Modification events
| (PID) Process: | (1988) AsyncClient.exe | Key: | HKEY_CLASSES_ROOT\Local Settings\MuiCache\16C\52C64B7E |
| Operation: | write | Name: | LanguageList |
Value: en-US | |||
| (PID) Process: | (1988) AsyncClient.exe | Key: | HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run |
| Operation: | write | Name: | svchost |
Value: "C:\Users\admin\AppData\Local\Temp\svchost.exe" | |||
| (PID) Process: | (2148) svchost.exe | Key: | HKEY_CLASSES_ROOT\Local Settings\MuiCache\16C\52C64B7E |
| Operation: | write | Name: | LanguageList |
Value: en-US | |||
Executable files
1
Suspicious files
3
Text files
1
Unknown types
1
Dropped files
PID | Process | Filename | Type | |
|---|---|---|---|---|
| 1988 | AsyncClient.exe | C:\Users\admin\AppData\Local\Temp\tmpFD6E.tmp.bat | text | |
MD5:— | SHA256:— | |||
| 1988 | AsyncClient.exe | C:\Users\admin\AppData\Local\Temp\svchost.exe | executable | |
MD5:— | SHA256:— | |||
| 2148 | svchost.exe | C:\Users\admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\77EC63BDA74BD0D0E0426DC8F8008506 | binary | |
MD5:— | SHA256:— | |||
| 2148 | svchost.exe | C:\Users\admin\AppData\Local\Temp\Cab1E64.tmp | compressed | |
MD5:ACAEDA60C79C6BCAC925EEB3653F45E0 | SHA256:6B0CECCF0103AFD89844761417C1D23ACC41F8AEBF3B7230765209B61EEE5658 | |||
| 2148 | svchost.exe | C:\Users\admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\77EC63BDA74BD0D0E0426DC8F8008506 | compressed | |
MD5:ACAEDA60C79C6BCAC925EEB3653F45E0 | SHA256:6B0CECCF0103AFD89844761417C1D23ACC41F8AEBF3B7230765209B61EEE5658 | |||
| 2148 | svchost.exe | C:\Users\admin\AppData\Local\Temp\Tar1E65.tmp | cat | |
MD5:D99661D0893A52A0700B8AE68457351A | SHA256:BDD5111162A6FA25682E18FA74E37E676D49CAFCB5B7207E98E5256D1EF0D003 | |||
Download PCAP, analyze network streams, HTTP content and a lot more at the full report
HTTP(S) requests
1
TCP/UDP connections
4
DNS requests
2
Threats
3
HTTP requests
PID | Process | Method | HTTP Code | IP | URL | CN | Type | Size | Reputation |
|---|---|---|---|---|---|---|---|---|---|
2148 | svchost.exe | GET | 200 | 209.197.3.8:80 | http://ctldl.windowsupdate.com/msdownload/update/v3/static/trustedr/en/authrootstl.cab?8a9a5055b6b821a4 | US | compressed | 59.9 Kb | whitelisted |
Download PCAP, analyze network streams, HTTP content and a lot more at the full report
Connections
PID | Process | IP | Domain | ASN | CN | Reputation |
|---|---|---|---|---|---|---|
2148 | svchost.exe | 209.197.3.8:80 | ctldl.windowsupdate.com | Highwinds Network Group, Inc. | US | whitelisted |
2148 | svchost.exe | 198.54.133.73:54893 | momo5050.ddns.net | tzulo, inc. | US | malicious |
DNS requests
Domain | IP | Reputation |
|---|---|---|
momo5050.ddns.net |
| malicious |
ctldl.windowsupdate.com |
| whitelisted |
Threats
PID | Process | Class | Message |
|---|---|---|---|
— | — | Potentially Bad Traffic | ET POLICY DNS Query to DynDNS Domain *.ddns .net |
2148 | svchost.exe | A Network Trojan was detected | ET TROJAN Observed Malicious SSL Cert (AsyncRAT Server) |
1 ETPRO signatures available at the full report