asyncrat | 2ba22889419f774476c31aa575e720606e9aa1c826992932a66cefacfb909af2

General

Target

bootstrap.exe
Size

45KB
MD5

25ab471d602be90115bdd6841ecbc7ab
SHA1

ac8cabe33a562d931d8829a363cc0b719885177a
SHA256

2ba22889419f774476c31aa575e720606e9aa1c826992932a66cefacfb909af2
SHA512

ddd9603f8c7a53b2056b9cbd4630a9e63db8768d7480d701ab0eb5f98289e7116b4cdfc05c073610f2d7bea1e9a79f10e11aa083437f1ad6bdbe048efbf04d11
SSDEEP

768:BuQSNTvEEaBrWUXFd5mo2qmi8KjPGaG6PIyzjbFgX3iV6lNwYoCXBDZ3x:BuQSNT8572xvKTkDy3bCXSElNwqd3x

Score

10^/10

asyncrat latentbot default discovery rat trojan

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

baltekbezmajtek.zapto.org:6606

baltekbezmajtek.zapto.org:7707

baltekbezmajtek.zapto.org:8808

Mutex

vBItBvMTrx8n

Attributes

delay
3
install
true
install_file
cached_files.exe
install_folder
%AppData%

aes.plain

Extracted

Family

latentbot

C2

baltekbezmajtek.zapto.org

Signatures

AsyncRat
AsyncRAT is designed to remotely monitor and control other computers written in C#.
rat asyncrat
LatentBot
Modular trojan written in Delphi which has been in-the-wild since 2013.
trojan latentbot

Async RAT payload 1 IoCs

rat

resource	yara_rule
behavioral2/files/0x000b00000002335b-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-1-5-21-2412658365-3084825385-3340777666-1000\Control Panel\International\Geo\Nation	bootstrap.exe

Executes dropped EXE 1 IoCs

pid	Process
2796	cached_files.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 6 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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cached_files.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	bootstrap.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
1096	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
1804	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
4220	bootstrap.exe
4220	bootstrap.exe
4220	bootstrap.exe
4220	bootstrap.exe
4220	bootstrap.exe
4220	bootstrap.exe
4220	bootstrap.exe
4220	bootstrap.exe
4220	bootstrap.exe
4220	bootstrap.exe
4220	bootstrap.exe
4220	bootstrap.exe
4220	bootstrap.exe
4220	bootstrap.exe
4220	bootstrap.exe
4220	bootstrap.exe
4220	bootstrap.exe
4220	bootstrap.exe
4220	bootstrap.exe
4220	bootstrap.exe
4220	bootstrap.exe
4220	bootstrap.exe
4220	bootstrap.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4220	bootstrap.exe
Token: SeDebugPrivilege	2796	cached_files.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4220 wrote to memory of 3916	4220	bootstrap.exe	92
PID 4220 wrote to memory of 3916	4220	bootstrap.exe	92
PID 4220 wrote to memory of 3916	4220	bootstrap.exe	92
PID 4220 wrote to memory of 2956	4220	bootstrap.exe	94
PID 4220 wrote to memory of 2956	4220	bootstrap.exe	94
PID 4220 wrote to memory of 2956	4220	bootstrap.exe	94
PID 3916 wrote to memory of 1804	3916	cmd.exe	96
PID 3916 wrote to memory of 1804	3916	cmd.exe	96
PID 3916 wrote to memory of 1804	3916	cmd.exe	96
PID 2956 wrote to memory of 1096	2956	cmd.exe	97
PID 2956 wrote to memory of 1096	2956	cmd.exe	97
PID 2956 wrote to memory of 1096	2956	cmd.exe	97
PID 2956 wrote to memory of 2796	2956	cmd.exe	100
PID 2956 wrote to memory of 2796	2956	cmd.exe	100
PID 2956 wrote to memory of 2796	2956	cmd.exe	100

C:\Users\Admin\AppData\Local\Temp\bootstrap.exe
"C:\Users\Admin\AppData\Local\Temp\bootstrap.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4220
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "cached_files" /tr '"C:\Users\Admin\AppData\Roaming\cached_files.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3916
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "cached_files" /tr '"C:\Users\Admin\AppData\Roaming\cached_files.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:1804
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp80D8.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2956
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:1096
- - C:\Users\Admin\AppData\Roaming\cached_files.exe
    "C:\Users\Admin\AppData\Roaming\cached_files.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:2796

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

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

C:\Users\Admin\AppData\Local\Temp\tmp80D8.tmp.bat

Filesize
156B

MD5
10cba6f01a78d5cbf14db433d9697b7f

SHA1
e328dbe4230e7397d97c12c84edd8e6bd1558c71

SHA256
e924cbc0d7d1aaec1cabf589a37a7d84a07fca3a13cf8c8de02720eb6ec76a40

SHA512
cee38dcf0737263a7eb7d91792ebdbc3dc652a6c445d4906bbdec6172efb90563dbcf3d03f8e67fa9e68b4727cfbf057b3d5780f993a6c7f1f671e9afff4439a

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

Filesize
45KB

MD5
25ab471d602be90115bdd6841ecbc7ab

SHA1
ac8cabe33a562d931d8829a363cc0b719885177a

SHA256
2ba22889419f774476c31aa575e720606e9aa1c826992932a66cefacfb909af2

SHA512
ddd9603f8c7a53b2056b9cbd4630a9e63db8768d7480d701ab0eb5f98289e7116b4cdfc05c073610f2d7bea1e9a79f10e11aa083437f1ad6bdbe048efbf04d11

Download Submit
memory/2796-13-0x0000000074DA0000-0x0000000075550000-memory.dmp

Filesize
7.7MB

Download
memory/2796-14-0x0000000074DA0000-0x0000000075550000-memory.dmp

Filesize
7.7MB

Download
memory/4220-0-0x0000000074E3E000-0x0000000074E3F000-memory.dmp

Filesize
4KB

Download
memory/4220-1-0x0000000000C50000-0x0000000000C62000-memory.dmp

Filesize
72KB

Download
memory/4220-2-0x0000000074E30000-0x00000000755E0000-memory.dmp

Filesize
7.7MB

Download
memory/4220-3-0x00000000054D0000-0x000000000556C000-memory.dmp

Filesize
624KB

Download
memory/4220-8-0x0000000074E30000-0x00000000755E0000-memory.dmp

Filesize
7.7MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads