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
behavioral1/files/0x000800000001ab44-12.dat	family_asyncrat

Executes dropped EXE 1 IoCs

pid	Process
4084	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
4576	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
2976	schtasks.exe

Suspicious behavior: EnumeratesProcesses 16 IoCs

pid	Process
4928	msedge.exe
4928	msedge.exe
4928	msedge.exe
4928	msedge.exe
4928	msedge.exe
4928	msedge.exe
4928	msedge.exe
4928	msedge.exe
4928	msedge.exe
4928	msedge.exe
4928	msedge.exe
4928	msedge.exe
4928	msedge.exe
4084	msedge.exe
4084	msedge.exe
4084	msedge.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4928	msedge.exe
Token: SeDebugPrivilege	4084	msedge.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4084	msedge.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 4928 wrote to memory of 3684	4928	msedge.exe	71
PID 4928 wrote to memory of 3684	4928	msedge.exe	71
PID 4928 wrote to memory of 1752	4928	msedge.exe	73
PID 4928 wrote to memory of 1752	4928	msedge.exe	73
PID 1752 wrote to memory of 4576	1752	cmd.exe	76
PID 1752 wrote to memory of 4576	1752	cmd.exe	76
PID 3684 wrote to memory of 2976	3684	cmd.exe	75
PID 3684 wrote to memory of 2976	3684	cmd.exe	75
PID 1752 wrote to memory of 4084	1752	cmd.exe	77
PID 1752 wrote to memory of 4084	1752	cmd.exe	77

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⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4928
- 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:3684
- - 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:2976
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp3A.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1752
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:4576
- - 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:4084

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

2

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
1KB

MD5
d63ff49d7c92016feb39812e4db10419

SHA1
2307d5e35ca9864ffefc93acf8573ea995ba189b

SHA256
375076241775962f3edc08a8c72832a00920b427a4f3332528d91d21e909fa12

SHA512
00f8c8d0336d6575b956876183199624d6f4d2056f2c0aa633a6f17c516f22ee648062d9bc419254d84c459323e9424f0da8aed9dd4e16c2926e5ba30e797d8a

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp3A.tmp.bat

Filesize
148B

MD5
9905e5f8e8a9d720d60cc95f1c0cc81e

SHA1
e0706219622bea93d8baf48bc2b14d6ef7482275

SHA256
e036338480c04a6ee772dd3cad1885c41d814b36cbb7e7d9665d2a2450695af8

SHA512
80a8885ed1691af87d124d050b40b6414eb73017a131949104f5341a666614da68de3990d982e6ccd570aa6347790454e3a545c05a282073fbdbd56ae48da8fe

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/4928-1-0x00000000005F0000-0x000000000061A000-memory.dmp

Filesize
168KB

Download
memory/4928-0-0x00007FFD1F893000-0x00007FFD1F894000-memory.dmp

Filesize
4KB

Download
memory/4928-3-0x00007FFD1F890000-0x00007FFD2027C000-memory.dmp

Filesize
9.9MB

Download
memory/4928-4-0x00007FFD1F890000-0x00007FFD2027C000-memory.dmp

Filesize
9.9MB

Download
memory/4928-10-0x00007FFD1F890000-0x00007FFD2027C000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads