asyncrat | 94bdc554c7cef3aef9bf90626f0cb6c0f3480e9f914a7aad93769a2904545ba6

General

Target
tmps91_vgf8.exe
Size 45KB
Sample260522-yaq5ssgs21
SHA256 94bdc554c7cef3aef9bf90626f0cb6c0f3480e9f914a7aad93769a2904545ba6
MD5 4a588256ac941119761162101ce87cb0
SHA1 964cbd3f88057bd2436ed69b6f7831362df11945
SHA512 713aceab420b42bdd6963ffe8c041d819c3a617f54cf0cdafcb23b9d18b32a15742d895c0462117f7427ed02f38b9c782daac710b47cd26ba2957ed234bdade8
SSDEEP 768:5udNpTNctooWUS7C+mo2qtqhkTwJaOPIcozjbfgaimLJ5+90iUG2G51WlBDZ0x:5udNpTNmU2s0w3co3bojO5+KiUswd0x
TLSH
T104232B0037E8822BF2BE5F7898F26145467AF6673603D58E1CC441DB5613FC68A526FE
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

theweekndstore.com:443
theweekndstore.com:80
theweekndstore.com:7797
theweekndstore.com:8707
theweekndstore.com:6620
www.theweekndstore.com:443
www.theweekndstore.com:80
www.theweekndstore.com:7797
www.theweekndstore.com:8707
www.theweekndstore.com:6620
connect.theweekndstore.com:443
connect.theweekndstore.com:80
connect.theweekndstore.com:7797
connect.theweekndstore.com:8707
connect.theweekndstore.com:6620
melissa.theweekndstore.com:443
melissa.theweekndstore.com:80
melissa.theweekndstore.com:7797
melissa.theweekndstore.com:8707
melissa.theweekndstore.com:6620
gootloader.theweekndstore.com:443
gootloader.theweekndstore.com:80
gootloader.theweekndstore.com:7797
gootloader.theweekndstore.com:8707
gootloader.theweekndstore.com:6620

Mutex

PdtH9eiVy3Yv

Attributes

delay
0
install
true
install_file
647tnn.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
behavioral2/files/0x0002000000022cb9-8.dat	family_asyncrat
behavioral2/memory/1148-10-0x0000000005420000-0x0000000005430000-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-1-5-21-3053180483-1881419501-3594244048-1000\Control Panel\International\Geo\Nation	tmps91_vgf8.exe

Executes dropped EXE 2 IoCs

pid	Process
1148	647tnn.exe
5556	647tnn.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	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	647tnn.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	647tnn.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	tmps91_vgf8.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
2484	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
772	schtasks.exe

Suspicious behavior: EnumeratesProcesses 21 IoCs

pid	Process
3084	tmps91_vgf8.exe
3084	tmps91_vgf8.exe
3084	tmps91_vgf8.exe
3084	tmps91_vgf8.exe
3084	tmps91_vgf8.exe
3084	tmps91_vgf8.exe
3084	tmps91_vgf8.exe
3084	tmps91_vgf8.exe
3084	tmps91_vgf8.exe
3084	tmps91_vgf8.exe
3084	tmps91_vgf8.exe
3084	tmps91_vgf8.exe
3084	tmps91_vgf8.exe
3084	tmps91_vgf8.exe
3084	tmps91_vgf8.exe
3084	tmps91_vgf8.exe
3084	tmps91_vgf8.exe
3084	tmps91_vgf8.exe
3084	tmps91_vgf8.exe
3084	tmps91_vgf8.exe
3084	tmps91_vgf8.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3084	tmps91_vgf8.exe
Token: SeDebugPrivilege	1148	647tnn.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 3084 wrote to memory of 4292	3084	tmps91_vgf8.exe	88
PID 3084 wrote to memory of 6088	3084	tmps91_vgf8.exe	90
PID 4292 wrote to memory of 772	4292	cmd.exe	92
PID 6088 wrote to memory of 2484	6088	cmd.exe	93
PID 6088 wrote to memory of 5556	6088	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\tmps91_vgf8.exe
"C:\Users\Admin\AppData\Local\Temp\tmps91_vgf8.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3084
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "647tnn" /tr '"C:\Users\Admin\AppData\Roaming\647tnn.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4292
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "647tnn" /tr '"C:\Users\Admin\AppData\Roaming\647tnn.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:772
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp5C44.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:6088
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:2484
- - C:\Users\Admin\AppData\Roaming\647tnn.exe
    "C:\Users\Admin\AppData\Roaming\647tnn.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:5556

C:\Users\Admin\AppData\Roaming\647tnn.exe
"C:\Users\Admin\AppData\Roaming\647tnn.exe"
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:1148

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

tmp5C44.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp5C44.tmp.bat
Size 150B
SHA256 bd9e373576b2bccdde2abff59d2ac6dcc98687a80aa6b93d1aeaa98a38550872
MD5 2c3407ccc28d9dcbbc4c82b49e5d0930
SHA1 28149972e69c82acffb273d2b6b792d8e1873646
SHA512 9a769f8a1a042f08802fd24c4f41d7d04d81f1b31b81b60cff76ffcc3c24b0a30efd9e16ece1343fe350ab11076ef90b8f496f920a0898028ff6e86f636b6a46
TLSH
T19FC02BA665C5EA4E2A06242306FADAECE17A7C9A3F40BB00C304501F92C0449F0D9381
MD5 SHA1 SHA512 TLSH

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647tnn.exe

Path C:\Users\Admin\AppData\Roaming\647tnn.exe
Size 45KB
SHA256 94bdc554c7cef3aef9bf90626f0cb6c0f3480e9f914a7aad93769a2904545ba6
MD5 4a588256ac941119761162101ce87cb0
SHA1 964cbd3f88057bd2436ed69b6f7831362df11945
SHA512 713aceab420b42bdd6963ffe8c041d819c3a617f54cf0cdafcb23b9d18b32a15742d895c0462117f7427ed02f38b9c782daac710b47cd26ba2957ed234bdade8
SSDEEP 768:5udNpTNctooWUS7C+mo2qtqhkTwJaOPIcozjbfgaimLJ5+90iUG2G51WlBDZ0x:5udNpTNmU2s0w3co3bojO5+KiUswd0x
TLSH
T104232B0037E8822BF2BE5F7898F26145467AF6673603D58E1CC441DB5613FC68A526FE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1148-10-0x0000000005420000-0x0000000005430000-memory.dmp

Download

memory/1148-13-0x0000000005420000-0x0000000005430000-memory.dmp

Download

memory/3084-0-0x0000000000ED0000-0x0000000000EE2000-memory.dmp

Download

memory/3084-1-0x0000000005700000-0x0000000005710000-memory.dmp

Download

memory/3084-2-0x00000000057B0000-0x000000000584C000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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