asyncrat | 5969e616a32e7cb09dd32ddca0c37e989a6131edb5c4a7b4367400c3f0e8527e

General

Target

flemme.exe
Size

112KB
MD5

2dd4a3e79a430fcf80e0c16c059c4c2c
SHA1

b32b851bb2746acfa2035d6765f7827e5880debb
SHA256

5969e616a32e7cb09dd32ddca0c37e989a6131edb5c4a7b4367400c3f0e8527e
SHA512

cae7ef83d8eb0f77d018dae6327b46cbb61e68623d64551492f883b9903a00ff410a9bda7c84f4348497e55b34490b315f855b95288e71710076cb246863a6a4
SSDEEP

3072:IucJTUUk2QGjf93SybKeYOQpiGU0tFsHEx:IucjNrr9CybEOq5

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

127.0.0.1:6606

127.0.0.1:7707

Mutex

zou2AAxxuspP

Attributes

delay
3
install
true
install_file
executorroblox.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 1 IoCs

rat

resource	yara_rule
behavioral2/files/0x000b00000002336d-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-1-5-21-1302416131-1437503476-2806442725-1000\Control Panel\International\Geo\Nation	flemme.exe

Executes dropped EXE 1 IoCs

pid	Process
5000	executorroblox.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	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	executorroblox.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	flemme.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
3924	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
4288	schtasks.exe

Suspicious behavior: EnumeratesProcesses 19 IoCs

pid	Process
988	flemme.exe
988	flemme.exe
988	flemme.exe
988	flemme.exe
988	flemme.exe
988	flemme.exe
988	flemme.exe
988	flemme.exe
988	flemme.exe
988	flemme.exe
988	flemme.exe
988	flemme.exe
988	flemme.exe
988	flemme.exe
988	flemme.exe
988	flemme.exe
988	flemme.exe
988	flemme.exe
988	flemme.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	988	flemme.exe
Token: SeDebugPrivilege	5000	executorroblox.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 988 wrote to memory of 2316	988	flemme.exe	87
PID 988 wrote to memory of 2316	988	flemme.exe	87
PID 988 wrote to memory of 2316	988	flemme.exe	87
PID 988 wrote to memory of 3800	988	flemme.exe	89
PID 988 wrote to memory of 3800	988	flemme.exe	89
PID 988 wrote to memory of 3800	988	flemme.exe	89
PID 2316 wrote to memory of 4288	2316	cmd.exe	91
PID 2316 wrote to memory of 4288	2316	cmd.exe	91
PID 2316 wrote to memory of 4288	2316	cmd.exe	91
PID 3800 wrote to memory of 3924	3800	cmd.exe	92
PID 3800 wrote to memory of 3924	3800	cmd.exe	92
PID 3800 wrote to memory of 3924	3800	cmd.exe	92
PID 3800 wrote to memory of 5000	3800	cmd.exe	93
PID 3800 wrote to memory of 5000	3800	cmd.exe	93
PID 3800 wrote to memory of 5000	3800	cmd.exe	93

C:\Users\Admin\AppData\Local\Temp\flemme.exe
"C:\Users\Admin\AppData\Local\Temp\flemme.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:988
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "executorroblox" /tr '"C:\Users\Admin\AppData\Roaming\executorroblox.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2316
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "executorroblox" /tr '"C:\Users\Admin\AppData\Roaming\executorroblox.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:4288
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpB6DC.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3800
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:3924
- - C:\Users\Admin\AppData\Roaming\executorroblox.exe
    "C:\Users\Admin\AppData\Roaming\executorroblox.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:5000

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\tmpB6DC.tmp.bat

Filesize
158B

MD5
b625d5df6fd74d495433d7ca93364ddb

SHA1
c909de770b3494ad027c7bd766a296bc060fb4b7

SHA256
b64c76e182e1c41ca5d9a43b5498344cfe283d3b98694999e75476c5384011c4

SHA512
22d78cbaf5300393c86e6f112f98bcdf95b29e755f13b31faa10fcdc568a362af0e1442a228cc4a9002141474dacfb945918ea353eaf17e62c39f808a2cc3375

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

Filesize
112KB

MD5
2dd4a3e79a430fcf80e0c16c059c4c2c

SHA1
b32b851bb2746acfa2035d6765f7827e5880debb

SHA256
5969e616a32e7cb09dd32ddca0c37e989a6131edb5c4a7b4367400c3f0e8527e

SHA512
cae7ef83d8eb0f77d018dae6327b46cbb61e68623d64551492f883b9903a00ff410a9bda7c84f4348497e55b34490b315f855b95288e71710076cb246863a6a4

Download Submit
memory/988-0-0x000000007486E000-0x000000007486F000-memory.dmp

Filesize
4KB

Download
memory/988-1-0x0000000000A60000-0x0000000000A82000-memory.dmp

Filesize
136KB

Download
memory/988-2-0x0000000074860000-0x0000000075010000-memory.dmp

Filesize
7.7MB

Download
memory/988-3-0x0000000005430000-0x00000000054CC000-memory.dmp

Filesize
624KB

Download
memory/988-9-0x0000000074860000-0x0000000075010000-memory.dmp

Filesize
7.7MB

Download
memory/5000-13-0x00000000747E0000-0x0000000074F90000-memory.dmp

Filesize
7.7MB

Download
memory/5000-14-0x00000000747E0000-0x0000000074F90000-memory.dmp

Filesize
7.7MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads