asyncrat | 5e3758c19d761560431f8fd8302aa6d2061568cbed3dc0a20ad3d4f5da93a956

Analysis

max time kernel
1046s
max time network
1051s
platform
windows10-2004_x64
resource
win10v2004-20240709-en
resource tags

arch:x64arch:x86image:win10v2004-20240709-enlocale:en-usos:windows10-2004-x64system
submitted
10-07-2024 23:54

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General

Target

Client.exe
Size

114KB
MD5

29e928f1f16131ca36a3aae3467141de
SHA1

9b586f0d13236c3280e5b7b3b592309b296d7fff
SHA256

5e3758c19d761560431f8fd8302aa6d2061568cbed3dc0a20ad3d4f5da93a956
SHA512

3f4ab2b645ec82c9899061973edb92bc4ef4ef3663603dea0de3a37447b8b94577e1357f398bef02f1ce94260f53f25387de72d872a055d7a9482b1f1b256314
SSDEEP

3072:QUVcxhzVCiPMVSe9VdQsH1bf7ADzQL4KvYMC29TwaGwYSOeBY:QtCiPMVSaesVbUzaFzC2yK

Score

10^/10

asyncrat default rat

Malware Config

Extracted

Family

asyncrat

Version

Venom RAT + HVNC + Stealer + Grabber v6.0.3

Botnet

Default

127.0.0.1:4449

127.0.0.1:6703

147.185.221.21:4449

147.185.221.21:6703

Mutex

uiagdedifgkrgllefg

Attributes

delay
1
install
true
install_file
dllhost.dat.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/0x000a0000000234ad-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-1-5-21-464762018-485119342-1613148473-1000\Control Panel\International\Geo\Nation	Client.exe

Executes dropped EXE 1 IoCs

pid	Process
3984	dllhost.dat.exe

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
1732	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
4384	schtasks.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
3668	Client.exe
3668	Client.exe
3668	Client.exe
3668	Client.exe
3668	Client.exe
3668	Client.exe
3668	Client.exe
3668	Client.exe
3668	Client.exe
3668	Client.exe
3668	Client.exe
3668	Client.exe
3668	Client.exe
3668	Client.exe
3668	Client.exe
3668	Client.exe
3668	Client.exe
3668	Client.exe
3668	Client.exe
3668	Client.exe
3668	Client.exe
3984	dllhost.dat.exe
3984	dllhost.dat.exe
3984	dllhost.dat.exe
3984	dllhost.dat.exe
3984	dllhost.dat.exe
3984	dllhost.dat.exe
3984	dllhost.dat.exe
3984	dllhost.dat.exe
3984	dllhost.dat.exe
3984	dllhost.dat.exe
3984	dllhost.dat.exe
3984	dllhost.dat.exe
3984	dllhost.dat.exe
3984	dllhost.dat.exe
3984	dllhost.dat.exe
3984	dllhost.dat.exe
3984	dllhost.dat.exe
3984	dllhost.dat.exe
3984	dllhost.dat.exe
3984	dllhost.dat.exe
3984	dllhost.dat.exe
3984	dllhost.dat.exe
3984	dllhost.dat.exe
3984	dllhost.dat.exe
3984	dllhost.dat.exe
3984	dllhost.dat.exe
3984	dllhost.dat.exe
3984	dllhost.dat.exe
3984	dllhost.dat.exe
3984	dllhost.dat.exe
3984	dllhost.dat.exe
3984	dllhost.dat.exe
3984	dllhost.dat.exe
3984	dllhost.dat.exe
3984	dllhost.dat.exe
3984	dllhost.dat.exe
3984	dllhost.dat.exe
3984	dllhost.dat.exe
3984	dllhost.dat.exe
3984	dllhost.dat.exe
3984	dllhost.dat.exe
3984	dllhost.dat.exe
3984	dllhost.dat.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3668	Client.exe
Token: SeDebugPrivilege	3984	dllhost.dat.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3984	dllhost.dat.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 3668 wrote to memory of 2888	3668	Client.exe	86
PID 3668 wrote to memory of 2888	3668	Client.exe	86
PID 3668 wrote to memory of 3140	3668	Client.exe	88
PID 3668 wrote to memory of 3140	3668	Client.exe	88
PID 2888 wrote to memory of 4384	2888	cmd.exe	90
PID 2888 wrote to memory of 4384	2888	cmd.exe	90
PID 3140 wrote to memory of 1732	3140	cmd.exe	91
PID 3140 wrote to memory of 1732	3140	cmd.exe	91
PID 3140 wrote to memory of 3984	3140	cmd.exe	93
PID 3140 wrote to memory of 3984	3140	cmd.exe	93

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\Client.exe
"C:\Users\Admin\AppData\Local\Temp\Client.exe"
1⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3668
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "dllhost.dat" /tr '"C:\Users\Admin\AppData\Roaming\dllhost.dat.exe"' & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2888
- - C:\Windows\system32\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "dllhost.dat" /tr '"C:\Users\Admin\AppData\Roaming\dllhost.dat.exe"'
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4384
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpC1E8.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3140
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:1732
- - C:\Users\Admin\AppData\Roaming\dllhost.dat.exe
    "C:\Users\Admin\AppData\Roaming\dllhost.dat.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    PID:3984

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmpC1E8.tmp.bat

Filesize
155B

MD5
03cc4809e9519cbe08851a4ef7a1c5c5

SHA1
2b13799e4350f2faa3a896ddac04b835abca87a2

SHA256
bca51fb4b2576cf06636e824f1a280bb7feef419405ce9b46f5a7b9b5d2049f0

SHA512
02c42f2fdf36b93250701a2d6d3fff65058d266164622f53b470390b4399e92ce1c26bf4530a27fbefc8c7488b2b9ce055b3c564c3e8efd4816bc2fbcb71357d

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\dllhost.dat.exe

Filesize
114KB

MD5
29e928f1f16131ca36a3aae3467141de

SHA1
9b586f0d13236c3280e5b7b3b592309b296d7fff

SHA256
5e3758c19d761560431f8fd8302aa6d2061568cbed3dc0a20ad3d4f5da93a956

SHA512
3f4ab2b645ec82c9899061973edb92bc4ef4ef3663603dea0de3a37447b8b94577e1357f398bef02f1ce94260f53f25387de72d872a055d7a9482b1f1b256314

Download Submit
memory/3668-0-0x00007FFCE44B3000-0x00007FFCE44B5000-memory.dmp

Filesize
8KB

Download
memory/3668-1-0x0000000000CD0000-0x0000000000CF2000-memory.dmp

Filesize
136KB

Download
memory/3668-3-0x00007FFCE44B0000-0x00007FFCE4F71000-memory.dmp

Filesize
10.8MB

Download
memory/3668-8-0x00007FFCE44B0000-0x00007FFCE4F71000-memory.dmp

Filesize
10.8MB

Download
memory/3668-9-0x00007FFCE44B0000-0x00007FFCE4F71000-memory.dmp

Filesize
10.8MB

Download