Analysis Overview
SHA256
2feff6f4c4076cf3938109607fe65dd5f0de893aad9ea2e732a2a37f3aa55f35
Threat Level: Known bad
The file AsyncClient.exe was found to be: Known bad.
Malicious Activity Summary
Async RAT payload
AsyncRat
Asyncrat family
Async RAT payload
Checks computer location settings
Executes dropped EXE
Unsigned PE
Enumerates physical storage devices
Suspicious use of WriteProcessMemory
Suspicious use of AdjustPrivilegeToken
Creates scheduled task(s)
Suspicious behavior: EnumeratesProcesses
Delays execution with timeout.exe
MITRE ATT&CK
Enterprise Matrix V6
Analysis: static1
Detonation Overview
Reported
2023-04-27 05:31
Signatures
Async RAT payload
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Asyncrat family
Unsigned PE
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Analysis: behavioral1
Detonation Overview
Submitted
2023-04-27 05:31
Reported
2023-04-27 05:34
Platform
win10v2004-20230220-en
Max time kernel
65s
Max time network
153s
Command Line
Signatures
AsyncRat
Async RAT payload
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
| N/A | N/A | N/A | N/A |
| N/A | N/A | N/A | N/A |
Checks computer location settings
| Description | Indicator | Process | Target |
| Key value queried | \REGISTRY\USER\S-1-5-21-4238149048-355649189-894321705-1000\Control Panel\International\Geo\Nation | C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe | N/A |
Executes dropped EXE
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\Microsoft Update.exe | N/A |
Enumerates physical storage devices
Creates scheduled task(s)
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SysWOW64\schtasks.exe | N/A |
Delays execution with timeout.exe
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SysWOW64\timeout.exe | N/A |
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
| Description | Indicator | Process | Target |
| Token: SeDebugPrivilege | N/A | C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe | N/A |
| Token: SeDebugPrivilege | N/A | C:\Users\Admin\AppData\Roaming\Microsoft Update.exe | N/A |
Suspicious use of WriteProcessMemory
Processes
C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe
"C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe"
C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "Microsoft Update" /tr '"C:\Users\Admin\AppData\Roaming\Microsoft Update.exe"' & exit
C:\Windows\SysWOW64\cmd.exe
C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp14A1.tmp.bat""
C:\Windows\SysWOW64\schtasks.exe
schtasks /create /f /sc onlogon /rl highest /tn "Microsoft Update" /tr '"C:\Users\Admin\AppData\Roaming\Microsoft Update.exe"'
C:\Windows\SysWOW64\timeout.exe
timeout 3
C:\Users\Admin\AppData\Roaming\Microsoft Update.exe
"C:\Users\Admin\AppData\Roaming\Microsoft Update.exe"
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | 133.211.185.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 133.17.126.40.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 108.211.229.192.in-addr.arpa | udp |
| IE | 20.50.80.210:443 | tcp | |
| US | 8.8.8.8:53 | 154.239.44.20.in-addr.arpa | udp |
| N/A | 127.0.0.1:61288 | tcp | |
| N/A | 127.0.0.1:61288 | tcp | |
| N/A | 127.0.0.1:61288 | tcp | |
| NL | 8.238.179.126:80 | tcp | |
| NL | 173.223.113.164:443 | tcp | |
| US | 146.70.165.10:61288 | tcp | |
| US | 8.8.8.8:53 | 10.165.70.146.in-addr.arpa | udp |
| US | 146.70.165.10:61288 | tcp | |
| US | 8.8.8.8:53 | 86.8.109.52.in-addr.arpa | udp |
| NL | 8.238.179.126:80 | tcp |
Files
memory/4164-133-0x0000000000450000-0x0000000000462000-memory.dmp
memory/4164-134-0x0000000004EC0000-0x0000000004ED0000-memory.dmp
memory/4164-135-0x0000000004F70000-0x000000000500C000-memory.dmp
C:\Users\Admin\AppData\Local\Temp\tmp14A1.tmp.bat
| MD5 | 37865e9459775c3ef1631b199545b835 |
| SHA1 | 1001e6bcdfd3036e6e8c06361f824035a985fbd4 |
| SHA256 | f0fb23cd2de16411075f6c84cc7646d59692b1b0ad6ff180ac69629b679c5024 |
| SHA512 | 7446f703a60c804cc2abe0c70e71d045be2017862df4a75e1fa55854f539ea10bfb0e9b4c609494ec36bbd37bf83896afa426accbfb01773721fb592ac8a75f0 |
C:\Users\Admin\AppData\Roaming\Microsoft Update.exe
| MD5 | f543c4cf51fb25b1bacb1bd54b9d8bc1 |
| SHA1 | 13b1846a380f4a4840cce067d274d1d0eaf4076e |
| SHA256 | 2feff6f4c4076cf3938109607fe65dd5f0de893aad9ea2e732a2a37f3aa55f35 |
| SHA512 | d3c7fcc79a69cdd87dbc873a237dcb963d8f14d80a63674384070538fafbde9230056c487a0833903608b71551104db7ef07ef3644b4ece4811de64bce8bdeb0 |
C:\Users\Admin\AppData\Roaming\Microsoft Update.exe
| MD5 | f543c4cf51fb25b1bacb1bd54b9d8bc1 |
| SHA1 | 13b1846a380f4a4840cce067d274d1d0eaf4076e |
| SHA256 | 2feff6f4c4076cf3938109607fe65dd5f0de893aad9ea2e732a2a37f3aa55f35 |
| SHA512 | d3c7fcc79a69cdd87dbc873a237dcb963d8f14d80a63674384070538fafbde9230056c487a0833903608b71551104db7ef07ef3644b4ece4811de64bce8bdeb0 |
memory/4540-144-0x0000000005880000-0x0000000005890000-memory.dmp
memory/4540-145-0x0000000005880000-0x0000000005890000-memory.dmp
memory/4540-146-0x0000000006120000-0x00000000066C4000-memory.dmp
memory/4540-147-0x0000000005B70000-0x0000000005BD6000-memory.dmp