asyncrat | 23eac34d8e359b2527ed4de7b51a1332fbb6887a6ffff30940af7ccda731de31

General

Target

svchost.exe
Size

64KB
MD5

f97fa46ef53c32b3d35e7eb702cf15ce
SHA1

92fcc3d3eea33cf659d0140079364f972867aca2
SHA256

23eac34d8e359b2527ed4de7b51a1332fbb6887a6ffff30940af7ccda731de31
SHA512

183b5498f946a9ee1c6f3c2b6d70d75b4e1415842c6f54fd427adf8a5579c1b8f803f7bc5f893e28eb16cdc2259aee92df78c15bc8023b078143d4918a5a5477
SSDEEP

1536:7/G2Wz1soi1sXsautYViUXObhnE9iqEvjUqT3WIx:7/G2Wz1soi10s/tYV3+bhERk3Vx

Score

10^/10

asyncrat new rat spyware stealer

Malware Config

Extracted

Family

asyncrat

Version

AsyncRAT

Botnet

New

C2

websites.vpndns.net:112

Mutex

AsyncMutex_5552

Attributes

delay
3
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

Async RAT payload 3 IoCs

rat

resource	yara_rule
behavioral2/memory/5000-133-0x00000000003D0000-0x00000000003E6000-memory.dmp	asyncrat
behavioral2/files/0x000300000000072d-141.dat	asyncrat
behavioral2/files/0x000300000000072d-142.dat	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-1-5-21-4238149048-355649189-894321705-1000\Control Panel\International\Geo\Nation	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
1904	svchost.exe

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

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

T1053

pid	Process
3184	schtasks.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
3204	timeout.exe

Suspicious behavior: EnumeratesProcesses 24 IoCs

pid	Process
5000	svchost.exe
5000	svchost.exe
5000	svchost.exe
5000	svchost.exe
5000	svchost.exe
5000	svchost.exe
5000	svchost.exe
5000	svchost.exe
5000	svchost.exe
5000	svchost.exe
5000	svchost.exe
5000	svchost.exe
5000	svchost.exe
5000	svchost.exe
5000	svchost.exe
5000	svchost.exe
5000	svchost.exe
5000	svchost.exe
5000	svchost.exe
5000	svchost.exe
5000	svchost.exe
5000	svchost.exe
5000	svchost.exe
1904	svchost.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	5000	svchost.exe
Token: SeDebugPrivilege	1904	svchost.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1904	svchost.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 5000 wrote to memory of 4840	5000	svchost.exe	84
PID 5000 wrote to memory of 4840	5000	svchost.exe	84
PID 5000 wrote to memory of 4840	5000	svchost.exe	84
PID 5000 wrote to memory of 368	5000	svchost.exe	86
PID 5000 wrote to memory of 368	5000	svchost.exe	86
PID 5000 wrote to memory of 368	5000	svchost.exe	86
PID 368 wrote to memory of 3204	368	cmd.exe	88
PID 368 wrote to memory of 3204	368	cmd.exe	88
PID 368 wrote to memory of 3204	368	cmd.exe	88
PID 4840 wrote to memory of 3184	4840	cmd.exe	89
PID 4840 wrote to memory of 3184	4840	cmd.exe	89
PID 4840 wrote to memory of 3184	4840	cmd.exe	89
PID 368 wrote to memory of 1904	368	cmd.exe	90
PID 368 wrote to memory of 1904	368	cmd.exe	90
PID 368 wrote to memory of 1904	368	cmd.exe	90

C:\Users\Admin\AppData\Local\Temp\svchost.exe
"C:\Users\Admin\AppData\Local\Temp\svchost.exe"
1⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5000
- C:\Windows\SysWOW64\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:4840
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "svchost" /tr '"C:\Users\Admin\AppData\Roaming\svchost.exe"'
    3⤵
    - Creates scheduled task(s)
    PID:3184
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpCC4D.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:368
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:3204
- - 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:1904

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

1

T1053

Persistence

Scheduled Task

1

T1053

Privilege Escalation

Scheduled Task

1

T1053

Defense Evasion

Credential Access

Credentials in Files

1

T1081

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Data from Local System

1

T1005

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\svchost.exe.log

Filesize
522B

MD5
acc9090417037dfa2a55b46ed86e32b8

SHA1
53fa6fb25fb3e88c24d2027aca6ae492b2800a4d

SHA256
2412679218bb0a7d05ceee32869bbb223619bde9966c4c460a68304a3367724b

SHA512
d51f7085ec147c708f446b9fb6923cd2fb64596d354ed929e125b30ace57c8cb3217589447a36960e5d3aea87a4e48aaa82c7509eced6d6c2cecd71fcfe3697b

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpCC4D.tmp.bat

Filesize
151B

MD5
46f92e556dd8e5f945ba46b00621e256

SHA1
4f6ff53d999bd412ff4655b8a85af3d964e4635c

SHA256
9c4ab824031b99410538b19fcdaef215ab438f289a50e08aa3a81970f4df89c9

SHA512
8a796c1ecb33fd1f74c455edf67d21b2c5118268e1437a3018455baf2ab776ddd0f1b227e3f64cbf0800c1a5c4d5545da35437571a3e22c2a0a7211b2d5da9f7

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

Filesize
64KB

MD5
f97fa46ef53c32b3d35e7eb702cf15ce

SHA1
92fcc3d3eea33cf659d0140079364f972867aca2

SHA256
23eac34d8e359b2527ed4de7b51a1332fbb6887a6ffff30940af7ccda731de31

SHA512
183b5498f946a9ee1c6f3c2b6d70d75b4e1415842c6f54fd427adf8a5579c1b8f803f7bc5f893e28eb16cdc2259aee92df78c15bc8023b078143d4918a5a5477

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

Filesize
64KB

MD5
f97fa46ef53c32b3d35e7eb702cf15ce

SHA1
92fcc3d3eea33cf659d0140079364f972867aca2

SHA256
23eac34d8e359b2527ed4de7b51a1332fbb6887a6ffff30940af7ccda731de31

SHA512
183b5498f946a9ee1c6f3c2b6d70d75b4e1415842c6f54fd427adf8a5579c1b8f803f7bc5f893e28eb16cdc2259aee92df78c15bc8023b078143d4918a5a5477

Download Submit
memory/1904-144-0x0000000005C50000-0x00000000061F4000-memory.dmp

Filesize
5.6MB

Download
memory/1904-145-0x0000000005740000-0x00000000057D2000-memory.dmp

Filesize
584KB

Download
memory/1904-146-0x0000000005710000-0x000000000571A000-memory.dmp

Filesize
40KB

Download
memory/1904-147-0x0000000005BB0000-0x0000000005C16000-memory.dmp

Filesize
408KB

Download
memory/5000-133-0x00000000003D0000-0x00000000003E6000-memory.dmp

Filesize
88KB

Download
memory/5000-134-0x00000000054A0000-0x000000000553C000-memory.dmp

Filesize
624KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads