asyncrat | eff8afa8be9672b440160bced9d105022d8f9297731ca0545bfc863d704ca7ba

General

Target
eff8afa8be9672b440160bced9d105022d8f9297731ca0545bfc863d704ca7ba.exe
Size 45KB
Sample260722-wtjtqaae49
SHA256 eff8afa8be9672b440160bced9d105022d8f9297731ca0545bfc863d704ca7ba
MD5 993460086a4c9fab0f890846b148e2d9
SHA1 600af4b49b4a26ce72ddea8d9b53d862ccc43a6b
SHA512 4395a9c272f5fb6cfac1a9802b9da45cb51edefd710bd60fd3f6bd2f28e64e4e194cbf3e86afe3e760b9c510a724f4803882d77990f3714ee49b71a47a798c39
SSDEEP 768:QuflpT8AkKuWUch7wmo2q9a9YikqHztOPIUzjbKgB3iE9u+joBBDZTx:QuflpT8Hv2nalK3U3bdBSCu+jWdTx
TLSH
T176233A003BE8C12BF2BE5F7899F26145857AF2633603D64A1CC452DB5613FC68A526FE
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

flimora.top:80
flimora.top:22
flimora.top:8080
flimora.top:8880
flimora.top:2052
flimora.top:2082
flimora.top:2086
flimora.top:2095
flimora.top:443
flimora.top:2053
flimora.top:2083
flimora.top:2087
flimora.top:2096
flimora.top:8443
www.flimora.top:80
www.flimora.top:22
www.flimora.top:8080
www.flimora.top:8880
www.flimora.top:2052
www.flimora.top:2082
www.flimora.top:2086
www.flimora.top:2095
www.flimora.top:443
www.flimora.top:2053
www.flimora.top:2083
www.flimora.top:2087
www.flimora.top:2096
www.flimora.top:8443
locky.flimora.top:80
locky.flimora.top:22
locky.flimora.top:8080
locky.flimora.top:8880
locky.flimora.top:2052
locky.flimora.top:2082
locky.flimora.top:2086
locky.flimora.top:2095
locky.flimora.top:443
locky.flimora.top:2053
locky.flimora.top:2083
locky.flimora.top:2087
locky.flimora.top:2096
locky.flimora.top:8443
klez.flimora.top:80
klez.flimora.top:22
klez.flimora.top:8080
klez.flimora.top:8880
klez.flimora.top:2052
klez.flimora.top:2082
klez.flimora.top:2086
klez.flimora.top:2095
klez.flimora.top:443
klez.flimora.top:2053
klez.flimora.top:2083
klez.flimora.top:2087
klez.flimora.top:2096
klez.flimora.top:8443

Mutex

AQWkOGof9igk

Attributes

delay
0
install
true
install_file
yfl24ih.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 2 IoCs

rat

resource	yara_rule
behavioral1/files/0x000300000001e68e-8.dat	family_asyncrat
behavioral1/memory/412-10-0x0000000004D20000-0x0000000004D30000-memory.dmp	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-1-5-21-1074038928-2032447174-945360078-1000\Control Panel\International\Geo\Nation	eff8afa8be9672b440160bced9d105022d8f9297731ca0545bfc863d704ca7ba.exe

Executes dropped EXE 2 IoCs

pid	Process
412	yfl24ih.exe
3360	yfl24ih.exe

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

System Information Discovery
T1082

Executes a command shell one-liner 1 TTPs 2 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
4008	cmd.exe
3680	cmd.exe

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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
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	yfl24ih.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	yfl24ih.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	eff8afa8be9672b440160bced9d105022d8f9297731ca0545bfc863d704ca7ba.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
3988	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
3192	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
5016	eff8afa8be9672b440160bced9d105022d8f9297731ca0545bfc863d704ca7ba.exe
5016	eff8afa8be9672b440160bced9d105022d8f9297731ca0545bfc863d704ca7ba.exe
5016	eff8afa8be9672b440160bced9d105022d8f9297731ca0545bfc863d704ca7ba.exe
5016	eff8afa8be9672b440160bced9d105022d8f9297731ca0545bfc863d704ca7ba.exe
5016	eff8afa8be9672b440160bced9d105022d8f9297731ca0545bfc863d704ca7ba.exe
5016	eff8afa8be9672b440160bced9d105022d8f9297731ca0545bfc863d704ca7ba.exe
5016	eff8afa8be9672b440160bced9d105022d8f9297731ca0545bfc863d704ca7ba.exe
5016	eff8afa8be9672b440160bced9d105022d8f9297731ca0545bfc863d704ca7ba.exe
5016	eff8afa8be9672b440160bced9d105022d8f9297731ca0545bfc863d704ca7ba.exe
5016	eff8afa8be9672b440160bced9d105022d8f9297731ca0545bfc863d704ca7ba.exe
5016	eff8afa8be9672b440160bced9d105022d8f9297731ca0545bfc863d704ca7ba.exe
5016	eff8afa8be9672b440160bced9d105022d8f9297731ca0545bfc863d704ca7ba.exe
5016	eff8afa8be9672b440160bced9d105022d8f9297731ca0545bfc863d704ca7ba.exe
5016	eff8afa8be9672b440160bced9d105022d8f9297731ca0545bfc863d704ca7ba.exe
5016	eff8afa8be9672b440160bced9d105022d8f9297731ca0545bfc863d704ca7ba.exe
5016	eff8afa8be9672b440160bced9d105022d8f9297731ca0545bfc863d704ca7ba.exe
5016	eff8afa8be9672b440160bced9d105022d8f9297731ca0545bfc863d704ca7ba.exe
5016	eff8afa8be9672b440160bced9d105022d8f9297731ca0545bfc863d704ca7ba.exe
5016	eff8afa8be9672b440160bced9d105022d8f9297731ca0545bfc863d704ca7ba.exe
5016	eff8afa8be9672b440160bced9d105022d8f9297731ca0545bfc863d704ca7ba.exe
5016	eff8afa8be9672b440160bced9d105022d8f9297731ca0545bfc863d704ca7ba.exe
5016	eff8afa8be9672b440160bced9d105022d8f9297731ca0545bfc863d704ca7ba.exe
5016	eff8afa8be9672b440160bced9d105022d8f9297731ca0545bfc863d704ca7ba.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	5016	eff8afa8be9672b440160bced9d105022d8f9297731ca0545bfc863d704ca7ba.exe
Token: SeDebugPrivilege	412	yfl24ih.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 5016 wrote to memory of 4008	5016	eff8afa8be9672b440160bced9d105022d8f9297731ca0545bfc863d704ca7ba.exe	85
PID 5016 wrote to memory of 3680	5016	eff8afa8be9672b440160bced9d105022d8f9297731ca0545bfc863d704ca7ba.exe	87
PID 3680 wrote to memory of 3988	3680	cmd.exe	89
PID 4008 wrote to memory of 3192	4008	cmd.exe	90
PID 3680 wrote to memory of 3360	3680	cmd.exe	97

C:\Users\Admin\AppData\Local\Temp\eff8afa8be9672b440160bced9d105022d8f9297731ca0545bfc863d704ca7ba.exe
"C:\Users\Admin\AppData\Local\Temp\eff8afa8be9672b440160bced9d105022d8f9297731ca0545bfc863d704ca7ba.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5016
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "yfl24ih" /tr '"C:\Users\Admin\AppData\Roaming\yfl24ih.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4008
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "yfl24ih" /tr '"C:\Users\Admin\AppData\Roaming\yfl24ih.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:3192
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp8548.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3680
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:3988
- - C:\Users\Admin\AppData\Roaming\yfl24ih.exe
    "C:\Users\Admin\AppData\Roaming\yfl24ih.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:3360

C:\Users\Admin\AppData\Roaming\yfl24ih.exe
"C:\Users\Admin\AppData\Roaming\yfl24ih.exe"
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:412

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Windows Command Shell

1

T1059.003

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

Replay Monitor

Loading Replay Monitor...

Downloads

tmp8548.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp8548.tmp.bat
Size 151B
SHA256 3caefe9779f94696a354da23ea2e5cbeeebc721b0e624b355d5df154fe5e5de2
MD5 2b345232fa6d633dcce4925310cfd835
SHA1 2d9abcf24dc9d8df5e36267f4754f453f0746d3b
SHA512 c008bc7f46489d9dde2454364f93a08cbc7e2af67bf61d696cfc1b13c46a5b221010e8698eaebf6c21498703047e7c0373709dd87fc5d98b8a68de9dadaf4bbd
TLSH
T13BC08C4271C9AA0E2905A86303BAA48C9166AD993E84AB908344400A2280848E099341
MD5 SHA1 SHA512 TLSH

Submit Download

yfl24ih.exe

Path C:\Users\Admin\AppData\Roaming\yfl24ih.exe
Size 45KB
SHA256 eff8afa8be9672b440160bced9d105022d8f9297731ca0545bfc863d704ca7ba
MD5 993460086a4c9fab0f890846b148e2d9
SHA1 600af4b49b4a26ce72ddea8d9b53d862ccc43a6b
SHA512 4395a9c272f5fb6cfac1a9802b9da45cb51edefd710bd60fd3f6bd2f28e64e4e194cbf3e86afe3e760b9c510a724f4803882d77990f3714ee49b71a47a798c39
SSDEEP 768:QuflpT8AkKuWUch7wmo2q9a9YikqHztOPIUzjbKgB3iE9u+joBBDZTx:QuflpT8Hv2nalK3U3bdBSCu+jWdTx
TLSH
T176233A003BE8C12BF2BE5F7899F26145857AF2633603D64A1CC452DB5613FC68A526FE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/412-10-0x0000000004D20000-0x0000000004D30000-memory.dmp

Download

memory/412-13-0x0000000004D20000-0x0000000004D30000-memory.dmp

Download

memory/5016-0-0x0000000000360000-0x0000000000372000-memory.dmp

Download

memory/5016-1-0x0000000004E50000-0x0000000004E60000-memory.dmp

Download

memory/5016-2-0x0000000004D10000-0x0000000004DAC000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads