asyncrat | fec63e2ee9e830df5298bd72464fe6753a60a5ef14bd3023e9ab99260878b3df

General

Target

MicroStrap.exe
Size

74KB
MD5

9785b81af0d8b024dadd31659a3a2d24
SHA1

14f4539dc755b69ad28f9c1953aeec3620669588
SHA256

fec63e2ee9e830df5298bd72464fe6753a60a5ef14bd3023e9ab99260878b3df
SHA512

002df3d93cde212d4a9678f167201599d5e874defe15f2e46494d72f442692bf62a8fcfa226963f0575335f0b1062a61508ca143b95614eef4a6d7cd563c5120
SSDEEP

1536:OUKkcx9pXCTyPMVEZ8kyIgH1bO/zeoBDQzcOLVclN:OUDcx958yPMVEZ81H1bOLRDQHBY

Score

10^/10

asyncrat venomrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

Venom RAT + HVNC + Stealer + Grabber v6.0.3

Botnet

Default

C2

195.88.218.126:2404

Mutex

rnxgsvfqmra

Attributes

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

aes.plain

Signatures

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

VenomRAT 2 IoCs

Detects VenomRAT.

rat

resource	yara_rule
behavioral2/memory/1656-1-0x00000000002E0000-0x00000000002F8000-memory.dmp	VenomRAT
behavioral2/files/0x000c000000023b78-11.dat	VenomRAT

Venomrat family
venomrat

Async RAT payload 1 IoCs

rat

resource	yara_rule
behavioral2/files/0x000c000000023b78-11.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-1-5-21-4089630652-1596403869-279772308-1000\Control Panel\International\Geo\Nation	MicroStrap.exe

Executes dropped EXE 1 IoCs

pid	Process
4536	svchost.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
3320	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
4780	schtasks.exe

Suspicious behavior: EnumeratesProcesses 28 IoCs

pid	Process
1656	MicroStrap.exe
1656	MicroStrap.exe
1656	MicroStrap.exe
1656	MicroStrap.exe
1656	MicroStrap.exe
1656	MicroStrap.exe
1656	MicroStrap.exe
1656	MicroStrap.exe
1656	MicroStrap.exe
1656	MicroStrap.exe
1656	MicroStrap.exe
1656	MicroStrap.exe
1656	MicroStrap.exe
1656	MicroStrap.exe
1656	MicroStrap.exe
1656	MicroStrap.exe
1656	MicroStrap.exe
1656	MicroStrap.exe
1656	MicroStrap.exe
1656	MicroStrap.exe
1656	MicroStrap.exe
1656	MicroStrap.exe
1656	MicroStrap.exe
4536	svchost.exe
4536	svchost.exe
4536	svchost.exe
4536	svchost.exe
4536	svchost.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1656	MicroStrap.exe
Token: SeDebugPrivilege	4536	svchost.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4536	svchost.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 1656 wrote to memory of 3680	1656	MicroStrap.exe	82
PID 1656 wrote to memory of 3680	1656	MicroStrap.exe	82
PID 1656 wrote to memory of 4152	1656	MicroStrap.exe	83
PID 1656 wrote to memory of 4152	1656	MicroStrap.exe	83
PID 4152 wrote to memory of 3320	4152	cmd.exe	86
PID 4152 wrote to memory of 3320	4152	cmd.exe	86
PID 3680 wrote to memory of 4780	3680	cmd.exe	87
PID 3680 wrote to memory of 4780	3680	cmd.exe	87
PID 4152 wrote to memory of 4536	4152	cmd.exe	88
PID 4152 wrote to memory of 4536	4152	cmd.exe	88

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\MicroStrap.exe
"C:\Users\Admin\AppData\Local\Temp\MicroStrap.exe"
1⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1656
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "svchost" /tr '"C:\Users\Admin\AppData\Roaming\svchost.exe"' & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3680
- - C:\Windows\system32\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "svchost" /tr '"C:\Users\Admin\AppData\Roaming\svchost.exe"'
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4780
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpA49C.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4152
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:3320
- - C:\Users\Admin\AppData\Roaming\svchost.exe
    "C:\Users\Admin\AppData\Roaming\svchost.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    PID:4536

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

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmpA49C.tmp.bat

Filesize
151B

MD5
f71b58c70c3afd344dc05a2c8767309f

SHA1
c870829eb5527cec686fc48e5f3fd556f61d4447

SHA256
db74bf851669782551b168715ad15bcbb6558b39e50c901a3c65cc58d46166f5

SHA512
55d35728d5b0f263160f64fc7218b911135f871e3e893d1369cf2591dee588229128315ad795815681929ba1f12c07a5e084ea6a4ac58b1ce7b41a4c2f17c59f

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\svchost.exe

Filesize
74KB

MD5
9785b81af0d8b024dadd31659a3a2d24

SHA1
14f4539dc755b69ad28f9c1953aeec3620669588

SHA256
fec63e2ee9e830df5298bd72464fe6753a60a5ef14bd3023e9ab99260878b3df

SHA512
002df3d93cde212d4a9678f167201599d5e874defe15f2e46494d72f442692bf62a8fcfa226963f0575335f0b1062a61508ca143b95614eef4a6d7cd563c5120

Download Submit
memory/1656-0-0x00007FF85E3C3000-0x00007FF85E3C5000-memory.dmp

Filesize
8KB

Download
memory/1656-1-0x00000000002E0000-0x00000000002F8000-memory.dmp

Filesize
96KB

Download
memory/1656-3-0x00007FF85E3C0000-0x00007FF85EE81000-memory.dmp

Filesize
10.8MB

Download
memory/1656-8-0x00007FF85E3C0000-0x00007FF85EE81000-memory.dmp

Filesize
10.8MB

Download
memory/4536-16-0x000000001E120000-0x000000001E196000-memory.dmp

Filesize
472KB

Download
memory/4536-17-0x000000001E0A0000-0x000000001E0AE000-memory.dmp

Filesize
56KB

Download
memory/4536-18-0x000000001E0D0000-0x000000001E0EE000-memory.dmp

Filesize
120KB

Download
memory/4536-19-0x000000001E2A0000-0x000000001E2B0000-memory.dmp

Filesize
64KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads