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| File name: | AsyncClient.exe |
| Full analysis: | https://app.any.run/tasks/bdbf2b5e-dd3b-42c4-bf56-244455148348 |
| 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 15, 2022, 02:14:00 |
| 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: | 3F4E6AFB3B29986554D4F9C210A9FF49 |
| SHA1: | 58455E46AC4E6B21CA7D83EA6110D6F4D66E0D04 |
| SHA256: | A5E0384D26B7B9BC63DAB77558175E8BBBF89D14BDE3819770A63857A339BF62 |
| SSDEEP: | 768:Wu1a21T3EiJfWUzuydmo2qzs+ICmLl4qPI+uldB570bA6lXMQH5l7qSgJbC1E4B8:Wu1a21T3xN2/GT+uIbA6lXF/7YJCdYxX |
MALICIOUS
Changes the autorun value in the registry
- AsyncClient.exe (PID: 2216)
ASYNCRAT was detected
- Update.exe (PID: 2740)
SUSPICIOUS
Checks supported languages
- AsyncClient.exe (PID: 2216)
- cmd.exe (PID: 1160)
- Update.exe (PID: 2740)
Reads the computer name
- AsyncClient.exe (PID: 2216)
- Update.exe (PID: 2740)
Executable content was dropped or overwritten
- AsyncClient.exe (PID: 2216)
Creates files in the user directory
- AsyncClient.exe (PID: 2216)
Starts CMD.EXE for commands execution
- AsyncClient.exe (PID: 2216)
Reads Environment values
- Update.exe (PID: 2740)
INFO
Checks supported languages
- timeout.exe (PID: 3984)
Reads settings of System Certificates
- Update.exe (PID: 2740)
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
| MachineType: | Intel 386 or later, and compatibles |
|---|---|
| TimeStamp: | 2020:05:10 07:24:51+02:00 |
| PEType: | PE32 |
| LinkerVersion: | 8 |
| CodeSize: | 45568 |
| InitializedDataSize: | 2560 |
| UninitializedDataSize: | - |
| EntryPoint: | 0xd08e |
| OSVersion: | 4 |
| ImageVersion: | - |
| SubsystemVersion: | 4 |
| Subsystem: | Windows GUI |
| FileVersionNumber: | 1.0.0.0 |
| ProductVersionNumber: | 1.0.0.0 |
| FileFlagsMask: | 0x003f |
| FileFlags: | (none) |
| FileOS: | Win32 |
| ObjectFileType: | Executable application |
| FileSubtype: | - |
| LanguageCode: | Neutral |
| CharacterSet: | Unicode |
| Comments: | - |
| CompanyName: | - |
| FileDescription: | - |
| FileVersion: | 1.0.0.0 |
| InternalName: | Stub.exe |
| LegalCopyright: | - |
| LegalTrademarks: | - |
| OriginalFileName: | Stub.exe |
| ProductName: | - |
| ProductVersion: | 1.0.0.0 |
| AssemblyVersion: | 1.0.0.0 |
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 | 0x0000B094 | 0x0000B200 | IMAGE_SCN_CNT_CODE, IMAGE_SCN_MEM_EXECUTE, IMAGE_SCN_MEM_READ | 5.62076 |
.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
1
Suspicious processes
1
Behavior graph
Click at the process to see the details
Process information
PID | CMD | Path | Indicators | Parent process |
|---|---|---|---|---|
| 2216 | "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 | ||||
| 1160 | C:\Windows\system32\cmd.exe /c ""C:\Users\admin\AppData\Local\Temp\tmp3BBE.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) | ||||
| 3984 | 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) | ||||
| 2740 | "C:\Users\admin\AppData\Roaming\Update.exe" | C:\Users\admin\AppData\Roaming\Update.exe | cmd.exe | |
User: admin Integrity Level: MEDIUM Version: 1.0.0.0 | ||||
Total events
4 701
Read events
4 672
Write events
29
Delete events
0
Modification events
| (PID) Process: | (2216) AsyncClient.exe | Key: | HKEY_CLASSES_ROOT\Local Settings\MuiCache\16C\52C64B7E |
| Operation: | write | Name: | LanguageList |
Value: en-US | |||
| (PID) Process: | (2216) AsyncClient.exe | Key: | HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run |
| Operation: | write | Name: | Update |
Value: "C:\Users\admin\AppData\Roaming\Update.exe" | |||
| (PID) Process: | (2740) Update.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 | |
|---|---|---|---|---|
| 2216 | AsyncClient.exe | C:\Users\admin\AppData\Local\Temp\tmp3BBE.tmp.bat | text | |
MD5:B7A4F3F621962DF8AC0FF06167D836FD | SHA256:7C53F3FCFD988E63536B63AD5F0C74EDD77A68C69404CC1DD6CF93CB21BCD9CB | |||
| 2740 | Update.exe | C:\Users\admin\AppData\Local\Temp\Tar5CC4.tmp | cat | |
MD5:D99661D0893A52A0700B8AE68457351A | SHA256:BDD5111162A6FA25682E18FA74E37E676D49CAFCB5B7207E98E5256D1EF0D003 | |||
| 2740 | Update.exe | C:\Users\admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\77EC63BDA74BD0D0E0426DC8F8008506 | binary | |
MD5:0CDBDC5E0B263E281F005FD0DB0639CE | SHA256:23BEC99866427879EEBA0175EB7341429C5AF84BA39FB35F32FD016717FCCA1E | |||
| 2216 | AsyncClient.exe | C:\Users\admin\AppData\Roaming\Update.exe | executable | |
MD5:3F4E6AFB3B29986554D4F9C210A9FF49 | SHA256:A5E0384D26B7B9BC63DAB77558175E8BBBF89D14BDE3819770A63857A339BF62 | |||
| 2740 | Update.exe | C:\Users\admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\77EC63BDA74BD0D0E0426DC8F8008506 | compressed | |
MD5:ACAEDA60C79C6BCAC925EEB3653F45E0 | SHA256:6B0CECCF0103AFD89844761417C1D23ACC41F8AEBF3B7230765209B61EEE5658 | |||
| 2740 | Update.exe | C:\Users\admin\AppData\Local\Temp\Cab5CC3.tmp | compressed | |
MD5:ACAEDA60C79C6BCAC925EEB3653F45E0 | SHA256:6B0CECCF0103AFD89844761417C1D23ACC41F8AEBF3B7230765209B61EEE5658 | |||
Download PCAP, analyze network streams, HTTP content and a lot more at the full report
HTTP(S) requests
1
TCP/UDP connections
3
DNS requests
2
Threats
0
HTTP requests
PID | Process | Method | HTTP Code | IP | URL | CN | Type | Size | Reputation |
|---|---|---|---|---|---|---|---|---|---|
2740 | Update.exe | GET | 200 | 67.26.75.254:80 | http://ctldl.windowsupdate.com/msdownload/update/v3/static/trustedr/en/authrootstl.cab?756723c48013f99a | 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 |
|---|---|---|---|---|---|---|
2740 | Update.exe | 67.26.75.254:80 | ctldl.windowsupdate.com | Level 3 Communications, Inc. | US | suspicious |
2740 | Update.exe | 198.54.133.72:54893 | 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 |
2740 | Update.exe | A Network Trojan was detected | ET TROJAN Observed Malicious SSL Cert (AsyncRAT Server) |
1 ETPRO signatures available at the full report