asyncrat | cbf37235e35f3823287ffa5adead151873944b9d540ad4c953d29c4f8711d1fd

General

Target

msedge.exe
Size

145KB
MD5

6a4ecf73deebde28f382fcfb5bec6217
SHA1

dd0e386f238500e74d131bda5c206509d5d07687
SHA256

cbf37235e35f3823287ffa5adead151873944b9d540ad4c953d29c4f8711d1fd
SHA512

859e185da74e2f300cc3d7e215c2cc8e3ed56db39a0de28f9589e8743fa8730377ed06d239ea18c10345f7d243b34c5f0f0a468692b2b3f9691a092aa6d38834
SSDEEP

3072:+UOcxHCoeGPMVhYSnu1bhnQIe5BV0WUniyimyJLY:+EeGPMVKiwb9re5v0WURyt

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

Venom RAT + HVNC + Stealer + Grabber v6.0.3

Botnet

Default

C2

147.185.221.20:49485

Mutex

geuttmzzyleqrt

Attributes

delay
3
install
true
install_file
msedge.exe
install_folder
%AppData%

aes.plain

Signatures

AsyncRat
AsyncRAT is designed to remotely monitor and control other computers written in C#.
rat asyncrat

Async RAT payload 1 IoCs

rat

resource	yara_rule
behavioral2/files/0x0008000000016985-12.dat	family_asyncrat

Checks computer location settings 2 TTPs 1 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-1-5-21-1302416131-1437503476-2806442725-1000\Control Panel\International\Geo\Nation	msedge.exe

Executes dropped EXE 1 IoCs

pid	Process
4604	msedge.exe

Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012
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
4888	timeout.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
3520	schtasks.exe

Suspicious behavior: EnumeratesProcesses 24 IoCs

pid	Process
2136	msedge.exe
2136	msedge.exe
2136	msedge.exe
2136	msedge.exe
2136	msedge.exe
2136	msedge.exe
2136	msedge.exe
2136	msedge.exe
2136	msedge.exe
2136	msedge.exe
2136	msedge.exe
2136	msedge.exe
2136	msedge.exe
2136	msedge.exe
2136	msedge.exe
2136	msedge.exe
2136	msedge.exe
2136	msedge.exe
2136	msedge.exe
2136	msedge.exe
2136	msedge.exe
4604	msedge.exe
4604	msedge.exe
4604	msedge.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2136	msedge.exe
Token: SeDebugPrivilege	4604	msedge.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4604	msedge.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 2136 wrote to memory of 1412	2136	msedge.exe	89
PID 2136 wrote to memory of 1412	2136	msedge.exe	89
PID 2136 wrote to memory of 4496	2136	msedge.exe	91
PID 2136 wrote to memory of 4496	2136	msedge.exe	91
PID 1412 wrote to memory of 3520	1412	cmd.exe	93
PID 1412 wrote to memory of 3520	1412	cmd.exe	93
PID 4496 wrote to memory of 4888	4496	cmd.exe	94
PID 4496 wrote to memory of 4888	4496	cmd.exe	94
PID 4496 wrote to memory of 4604	4496	cmd.exe	95
PID 4496 wrote to memory of 4604	4496	cmd.exe	95

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

C:\Users\Admin\AppData\Local\Temp\msedge.exe
"C:\Users\Admin\AppData\Local\Temp\msedge.exe"
1⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2136
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "msedge" /tr '"C:\Users\Admin\AppData\Roaming\msedge.exe"' & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1412
- - C:\Windows\system32\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "msedge" /tr '"C:\Users\Admin\AppData\Roaming\msedge.exe"'
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:3520
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpB45C.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4496
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:4888
- - C:\Users\Admin\AppData\Roaming\msedge.exe
    "C:\Users\Admin\AppData\Roaming\msedge.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    PID:4604

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

3

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\msedge.exe.log

Filesize
1KB

MD5
baf55b95da4a601229647f25dad12878

SHA1
abc16954ebfd213733c4493fc1910164d825cac8

SHA256
ee954c5d8156fd8890e582c716e5758ed9b33721258f10e758bdc31ccbcb1924

SHA512
24f502fedb1a305d0d7b08857ffc1db9b2359ff34e06d5748ecc84e35c985f29a20d9f0a533bea32d234ab37097ec0481620c63b14ac89b280e75e14d19fd545

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpB45C.tmp.bat

Filesize
150B

MD5
6301863d5505d8f4cfe3ab729685318c

SHA1
0da14b5583ad744cc149eae4265f3aed6c2a8047

SHA256
968497b99857b488d7cc15a49346aa322adcb9d408059405426958980ad34aa9

SHA512
e0f9fea91581d8aa4c0d2f90296032f01af6bddc76eaacf48694508ee6688e2bffd758d05b555ce3e2d0ff763afa69f5d6de278ce0da601d3395a6469b7c1bac

Download Submit
C:\Users\Admin\AppData\Roaming\MyData\DataLogs.conf

Filesize
8B

MD5
cf759e4c5f14fe3eec41b87ed756cea8

SHA1
c27c796bb3c2fac929359563676f4ba1ffada1f5

SHA256
c9f9f193409217f73cc976ad078c6f8bf65d3aabcf5fad3e5a47536d47aa6761

SHA512
c7f832aee13a5eb36d145f35d4464374a9e12fa2017f3c2257442d67483b35a55eccae7f7729243350125b37033e075efbc2303839fd86b81b9b4dca3626953b

Download Submit
C:\Users\Admin\AppData\Roaming\msedge.exe

Filesize
145KB

MD5
6a4ecf73deebde28f382fcfb5bec6217

SHA1
dd0e386f238500e74d131bda5c206509d5d07687

SHA256
cbf37235e35f3823287ffa5adead151873944b9d540ad4c953d29c4f8711d1fd

SHA512
859e185da74e2f300cc3d7e215c2cc8e3ed56db39a0de28f9589e8743fa8730377ed06d239ea18c10345f7d243b34c5f0f0a468692b2b3f9691a092aa6d38834

Download Submit
memory/2136-0-0x00007FFA20C73000-0x00007FFA20C75000-memory.dmp

Filesize
8KB

Download
memory/2136-1-0x0000000000A90000-0x0000000000ABA000-memory.dmp

Filesize
168KB

Download
memory/2136-3-0x00007FFA20C70000-0x00007FFA21731000-memory.dmp

Filesize
10.8MB

Download
memory/2136-8-0x00007FFA20C70000-0x00007FFA21731000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads