asyncrat | fce223eb8d3e1ae81cd4d54f4f74a1a551c42dedd5c8d56554a4a23ade81db3d

General

Target
tmpyzk0c4vx.exe
Size 45KB
Sample260522-x6zw5sf14v
SHA256 fce223eb8d3e1ae81cd4d54f4f74a1a551c42dedd5c8d56554a4a23ade81db3d
MD5 fc5cc90eab47778ddd2ca3eda7f361fe
SHA1 970a9cb0de88205194095259e89ca0f22e6a852e
SHA512 4fd53071ee7ea6218d0f71d77bf07540fc57863a64bbda33530eea47b16768e3e1675392a1b2995a20feefae870ce60e669471fa2e4f6c4292cf60d87faec6e9
SSDEEP 768:wuD/ZTpw7bmaWUg3gSk0mo2qlneeXK5oibbb6TN8/nPI6WzjbtgX3izq4Acvl+pu:wuD/ZTpMZSB2DeEqTNKA6W3b6XSzhZvv
TLSH
T1EB231A103BE8C12BF2BE4F74A9F26145867AF2772603D94E1CC4519B5623FC6CA426ED
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

default defense_evasion discovery execution asyncrat persistence rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

sfrecess.com:443
sfrecess.com:80
sfrecess.com:7797
sfrecess.com:8707
sfrecess.com:6620
www.sfrecess.com:443
www.sfrecess.com:80
www.sfrecess.com:7797
www.sfrecess.com:8707
www.sfrecess.com:6620
remote.sfrecess.com:443
remote.sfrecess.com:80
remote.sfrecess.com:7797
remote.sfrecess.com:8707
remote.sfrecess.com:6620
sasser.sfrecess.com:443
sasser.sfrecess.com:80
sasser.sfrecess.com:7797
sasser.sfrecess.com:8707
sasser.sfrecess.com:6620
iloveyou.sfrecess.com:443
iloveyou.sfrecess.com:80
iloveyou.sfrecess.com:7797
iloveyou.sfrecess.com:8707
iloveyou.sfrecess.com:6620
malware.sfrecess.com:443
malware.sfrecess.com:80
malware.sfrecess.com:7797
malware.sfrecess.com:8707
malware.sfrecess.com:6620

Mutex

3E5LMhaZAwK3

Attributes

delay
0
install
true
install_file
mf18w.exe
install_folder
%AppData%

aes.plain

Signatures

Family: 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/0x0002000000022c5b-8.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-1-5-21-540052884-2969440504-464782435-1000\Control Panel\International\Geo\Nation	tmpyzk0c4vx.exe

Executes dropped EXE 2 IoCs

pid	Process
3952	mf18w.exe
2596	mf18w.exe

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 7 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	mf18w.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	mf18w.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	tmpyzk0c4vx.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
628	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
5052	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
4332	tmpyzk0c4vx.exe
4332	tmpyzk0c4vx.exe
4332	tmpyzk0c4vx.exe
4332	tmpyzk0c4vx.exe
4332	tmpyzk0c4vx.exe
4332	tmpyzk0c4vx.exe
4332	tmpyzk0c4vx.exe
4332	tmpyzk0c4vx.exe
4332	tmpyzk0c4vx.exe
4332	tmpyzk0c4vx.exe
4332	tmpyzk0c4vx.exe
4332	tmpyzk0c4vx.exe
4332	tmpyzk0c4vx.exe
4332	tmpyzk0c4vx.exe
4332	tmpyzk0c4vx.exe
4332	tmpyzk0c4vx.exe
4332	tmpyzk0c4vx.exe
4332	tmpyzk0c4vx.exe
4332	tmpyzk0c4vx.exe
4332	tmpyzk0c4vx.exe
4332	tmpyzk0c4vx.exe
4332	tmpyzk0c4vx.exe
4332	tmpyzk0c4vx.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4332	tmpyzk0c4vx.exe
Token: SeDebugPrivilege	3952	mf18w.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 4332 wrote to memory of 4256	4332	tmpyzk0c4vx.exe	90
PID 4332 wrote to memory of 4200	4332	tmpyzk0c4vx.exe	92
PID 4200 wrote to memory of 628	4200	cmd.exe	94
PID 4256 wrote to memory of 5052	4256	cmd.exe	95
PID 4200 wrote to memory of 2596	4200	cmd.exe	98

C:\Users\Admin\AppData\Local\Temp\tmpyzk0c4vx.exe
"C:\Users\Admin\AppData\Local\Temp\tmpyzk0c4vx.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4332
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "mf18w" /tr '"C:\Users\Admin\AppData\Roaming\mf18w.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4256
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "mf18w" /tr '"C:\Users\Admin\AppData\Roaming\mf18w.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:5052
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpFCBF.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4200
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:628
- - C:\Users\Admin\AppData\Roaming\mf18w.exe
    "C:\Users\Admin\AppData\Roaming\mf18w.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:2596

C:\Users\Admin\AppData\Roaming\mf18w.exe
"C:\Users\Admin\AppData\Roaming\mf18w.exe"
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:3952

Network

MITRE ATT&CK Enterprise v16

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

1

T1012

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

tmpFCBF.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmpFCBF.tmp.bat
Size 149B
SHA256 3d1d8ede90508b8be9d8feb05e22f0ad5e3949ec230242f3e03deb6e40e0a7f4
MD5 a0ced50792858268636e28d8aa9eb562
SHA1 1ca58d8a46eb96db723cf793bd78e0cc1847ab1d
SHA512 8ae80f9220be7cd8b935a31604a80b8f6999631859de1e306057772a5e20abb13a41eec759a3550c496233914ec6dbb9576eda2b7fc07374f0408c9ce4541073
TLSH
T115C02B4351C5FACE390914A306FEE48C9172AD1D3F80FF00C308440E22C0448F5DD386
MD5 SHA1 SHA512 TLSH

Submit Download

mf18w.exe

Path C:\Users\Admin\AppData\Roaming\mf18w.exe
Size 45KB
SHA256 fce223eb8d3e1ae81cd4d54f4f74a1a551c42dedd5c8d56554a4a23ade81db3d
MD5 fc5cc90eab47778ddd2ca3eda7f361fe
SHA1 970a9cb0de88205194095259e89ca0f22e6a852e
SHA512 4fd53071ee7ea6218d0f71d77bf07540fc57863a64bbda33530eea47b16768e3e1675392a1b2995a20feefae870ce60e669471fa2e4f6c4292cf60d87faec6e9
SSDEEP 768:wuD/ZTpw7bmaWUg3gSk0mo2qlneeXK5oibbb6TN8/nPI6WzjbtgX3izq4Acvl+pu:wuD/ZTpMZSB2DeEqTNKA6W3b6XSzhZvv
TLSH
T1EB231A103BE8C12BF2BE4F74A9F26145867AF2772603D94E1CC4519B5623FC6CA426ED
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3952-10-0x0000000005890000-0x00000000058A0000-memory.dmp

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memory/3952-13-0x0000000005890000-0x00000000058A0000-memory.dmp

Download

memory/4332-0-0x0000000000320000-0x0000000000332000-memory.dmp

Download

memory/4332-1-0x0000000002760000-0x0000000002770000-memory.dmp

Download

memory/4332-2-0x0000000004D50000-0x0000000004DEC000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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