asyncrat | 255569d7156794ac033567269a847e93acdfc95126dbad54af5b8909bba4c553

General

Target

Client.exe
Size

74KB
MD5

c9e368cb65ed6c541e29b52aeb4c2af4
SHA1

b2fe42b7ee53d11cc6cac3e6a99a92f72ff9cc01
SHA256

255569d7156794ac033567269a847e93acdfc95126dbad54af5b8909bba4c553
SHA512

10ad380013e2efa9f85110e97ebb1187c22fadc2b43f6633af65aedb3b9ffc0355695a70858eef8a6d819423778552f17ebaeeb19ba3b521da2584a9f1e74b81
SSDEEP

1536:2UvNwcxKHXwzCtmPMV2e9VdQuDI6H1bf/OSQzcqLVclN:2UvicxK8WmPMV2e9VdQsH1bffQbBY

Score

10^/10

asyncrat default discovery evasion rat trojan

Malware Config

Extracted

Family

asyncrat

Version

Venom RAT + HVNC + Stealer + Grabber v6.0.3

Botnet

Default

C2

147.185.221.19:38173

Mutex

uuhaiushdishajkdhwuasudh

Attributes

delay
1
install
true
install_file
svhost.exe
install_folder
%AppData%

aes.plain

Signatures

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

UAC bypass 3 TTPs 3 IoCs

evasion trojan

Bypass User Account Control

T1548.002

Disable or Modify Tools

T1562.001

Modify Registry

T1112

Processes:

svhost.exe

description	ioc	process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\consentpromptbehavioradmin = "0"	svhost.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\enablelua = "0"	svhost.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\promptonsecuredesktop = "0"	svhost.exe

Async RAT payload 1 IoCs

rat

Processes:

resource	yara_rule
C:\Users\Admin\AppData\Roaming\svhost.exe	family_asyncrat

Executes dropped EXE 1 IoCs

Processes:

svhost.exe

pid process

2380 svhost.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

pid	process
2380	svhost.exe

Checks whether UAC is enabled 1 TTPs 2 IoCs

evasion trojan

System Information Discovery

T1082

Processes:

svhost.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\enablelua	svhost.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\enablelua = "0"	svhost.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082
Creates scheduled task(s) 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence

Scheduled Task/Job
T1053

Processes:

schtasks.exe

pid process

3184 schtasks.exe
Delays execution with timeout.exe 1 IoCs
evasion

Processes:

timeout.exe

pid process

4976 timeout.exe

pid	process
3184	schtasks.exe

pid	process
4976	timeout.exe

Suspicious behavior: EnumeratesProcesses 20 IoCs

Processes:

Client.exesvhost.exe

pid	process
2932	Client.exe
2932	Client.exe
2932	Client.exe
2932	Client.exe
2932	Client.exe
2932	Client.exe
2932	Client.exe
2932	Client.exe
2932	Client.exe
2932	Client.exe
2932	Client.exe
2932	Client.exe
2932	Client.exe
2932	Client.exe
2932	Client.exe
2932	Client.exe
2932	Client.exe
2380	svhost.exe
2380	svhost.exe
2380	svhost.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Client.exesvhost.exe

description pid process

Token: SeDebugPrivilege 2932 Client.exe
Token: SeDebugPrivilege 2380 svhost.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

svhost.exe

pid process

2380 svhost.exe

description	pid	process
Token: SeDebugPrivilege	2932	Client.exe
Token: SeDebugPrivilege	2380	svhost.exe

pid	process
2380	svhost.exe

Suspicious use of WriteProcessMemory 10 IoCs

Processes:

Client.execmd.execmd.exe

description	pid	process	target process
PID 2932 wrote to memory of 3180	2932	Client.exe	cmd.exe
PID 2932 wrote to memory of 3180	2932	Client.exe	cmd.exe
PID 2932 wrote to memory of 864	2932	Client.exe	cmd.exe
PID 2932 wrote to memory of 864	2932	Client.exe	cmd.exe
PID 3180 wrote to memory of 3184	3180	cmd.exe	schtasks.exe
PID 3180 wrote to memory of 3184	3180	cmd.exe	schtasks.exe
PID 864 wrote to memory of 4976	864	cmd.exe	timeout.exe
PID 864 wrote to memory of 4976	864	cmd.exe	timeout.exe
PID 864 wrote to memory of 2380	864	cmd.exe	svhost.exe
PID 864 wrote to memory of 2380	864	cmd.exe	svhost.exe

System policy modification 1 TTPs 3 IoCs

evasion

Modify Registry

T1112

Processes:

svhost.exe

description	ioc	process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\consentpromptbehavioradmin = "0"	svhost.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\enablelua = "0"	svhost.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\promptonsecuredesktop = "0"	svhost.exe

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⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2932
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "svhost" /tr '"C:\Users\Admin\AppData\Roaming\svhost.exe"' & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3180
- - C:\Windows\system32\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "svhost" /tr '"C:\Users\Admin\AppData\Roaming\svhost.exe"'
    3⤵
    - Creates scheduled task(s)
    PID:3184
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp5890.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:864
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:4976
- - C:\Users\Admin\AppData\Roaming\svhost.exe
    "C:\Users\Admin\AppData\Roaming\svhost.exe"
    3⤵
    - UAC bypass
    - Executes dropped EXE
    - Checks whether UAC is enabled
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    - System policy modification
    PID:2380

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Persistence

Scheduled Task/Job

1

T1053

Privilege Escalation

Abuse Elevation Control Mechanism

1

T1548

Bypass User Account Control

Scheduled Task/Job

Defense Evasion

Abuse Elevation Control Mechanism

1

T1548

Bypass User Account Control

1

T1548.002

Impair Defenses

1

T1562

Disable or Modify Tools

Modify Registry

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmp5890.tmp.bat

Filesize
150B

MD5
f7679c9b58154c966a608df236405355

SHA1
76a3f24a12b89481494b02b99b6cd05d6be8eb1b

SHA256
d7b76fd191fc72fa80f622ca930aae8cde57cf73ac992e5c00e36b16a183cd3a

SHA512
fcb026b890f121dade6115a11bd448c9678df02a8250845e52813e1d2dca2de0a47f1bc061ac531e31f1528148c86b1c887449cbf5c82d98cddac249dc72d443

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\svhost.exe

Filesize
74KB

MD5
c9e368cb65ed6c541e29b52aeb4c2af4

SHA1
b2fe42b7ee53d11cc6cac3e6a99a92f72ff9cc01

SHA256
255569d7156794ac033567269a847e93acdfc95126dbad54af5b8909bba4c553

SHA512
10ad380013e2efa9f85110e97ebb1187c22fadc2b43f6633af65aedb3b9ffc0355695a70858eef8a6d819423778552f17ebaeeb19ba3b521da2584a9f1e74b81

Download Submit
memory/2380-18-0x000000001B600000-0x000000001B60E000-memory.dmp

Filesize
56KB

Download
memory/2380-17-0x000000001CD00000-0x000000001CD76000-memory.dmp

Filesize
472KB

Download
memory/2380-19-0x000000001BB70000-0x000000001BB8E000-memory.dmp

Filesize
120KB

Download
memory/2380-20-0x000000001B610000-0x000000001B632000-memory.dmp

Filesize
136KB

Download
memory/2380-21-0x000000001BB90000-0x000000001BBA0000-memory.dmp

Filesize
64KB

Download
memory/2932-9-0x00007FFD0CE60000-0x00007FFD0D922000-memory.dmp

Filesize
10.8MB

Download
memory/2932-4-0x00007FFD0CE60000-0x00007FFD0D922000-memory.dmp

Filesize
10.8MB

Download
memory/2932-3-0x00007FFD0CE60000-0x00007FFD0D922000-memory.dmp

Filesize
10.8MB

Download
memory/2932-1-0x0000000000AB0000-0x0000000000AC8000-memory.dmp

Filesize
96KB

Download
memory/2932-0-0x00007FFD0CE63000-0x00007FFD0CE65000-memory.dmp

Filesize
8KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads