asyncrat | 41b096d69c1eefb59b11c4a86e05c15b5e6e90a06d51ce3ef3d8a83a248a4879

General

Target
vancefrosv3.rar
Size 24KB
Sample260720-yleadaft3s
SHA256 41b096d69c1eefb59b11c4a86e05c15b5e6e90a06d51ce3ef3d8a83a248a4879
MD5 c7fe052b5658f1f344113e51c4bce494
SHA1 69052b61d199034ba404dc38910d256798b9662e
SHA512 b855df7d48e5db06590f363202ab5ead0482758b2b67b294e737cbe7c3de8c3d66be44102a24340bfd00689427e2eb5bf4b6e5fcf53dc0417ef5092ee3662974
SSDEEP 768:2jO/154y2S3gzdlyAIIK1JDaZQDgNt7/u/G5Ow:2jONWyDGdsAg1JaZGg/7/uel
TLSH
T1B5B2E1C22217E3405091D76C0A70C359DC83E8DB013FAA6F4AB1E4AA52F9AF7D2E55DD
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

veiljijaa-54399.portmap.host:8080

Mutex

rPMacS25GfiU

Attributes

delay
3
install
true
install_file
vancefrosv3.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
behavioral1/files/0x000e00000002446f-4.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-1-5-21-1788976790-1541110888-1636651838-1000\Control Panel\International\Geo\Nation	vancefrosv3.exe

Executes dropped EXE 3 IoCs

pid	Process
628	vancefrosv3.exe
3816	vancefrosv3.exe
828	vancefrosv3.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
3516	cmd.exe
856	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	vancefrosv3.exe
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	vancefrosv3.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	vancefrosv3.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
4212	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
2104	schtasks.exe

Suspicious behavior: EnumeratesProcesses 37 IoCs

pid	Process
628	vancefrosv3.exe
628	vancefrosv3.exe
628	vancefrosv3.exe
628	vancefrosv3.exe
628	vancefrosv3.exe
628	vancefrosv3.exe
628	vancefrosv3.exe
628	vancefrosv3.exe
628	vancefrosv3.exe
628	vancefrosv3.exe
628	vancefrosv3.exe
628	vancefrosv3.exe
628	vancefrosv3.exe
628	vancefrosv3.exe
628	vancefrosv3.exe
628	vancefrosv3.exe
628	vancefrosv3.exe
628	vancefrosv3.exe
628	vancefrosv3.exe
628	vancefrosv3.exe
628	vancefrosv3.exe
628	vancefrosv3.exe
628	vancefrosv3.exe
1944	7zFM.exe
1944	7zFM.exe
1944	7zFM.exe
1944	7zFM.exe
1944	7zFM.exe
1944	7zFM.exe
1944	7zFM.exe
1944	7zFM.exe
1944	7zFM.exe
1944	7zFM.exe
1944	7zFM.exe
1944	7zFM.exe
1944	7zFM.exe
1944	7zFM.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeRestorePrivilege	1944	7zFM.exe
Token: 35	1944	7zFM.exe
Token: SeSecurityPrivilege	1944	7zFM.exe
Token: SeDebugPrivilege	628	vancefrosv3.exe
Token: SeDebugPrivilege	3816	vancefrosv3.exe
Token: SeDebugPrivilege	3816	vancefrosv3.exe

Suspicious use of FindShellTrayWindow 2 IoCs

pid	Process
1944	7zFM.exe
1944	7zFM.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1944 wrote to memory of 628	1944	7zFM.exe	87
PID 628 wrote to memory of 3516	628	vancefrosv3.exe	90
PID 628 wrote to memory of 856	628	vancefrosv3.exe	92
PID 856 wrote to memory of 4212	856	cmd.exe	94
PID 3516 wrote to memory of 2104	3516	cmd.exe	95
PID 856 wrote to memory of 828	856	cmd.exe	98

C:\Program Files\7-Zip\7zFM.exe
"C:\Program Files\7-Zip\7zFM.exe" "C:\Users\Admin\AppData\Local\Temp\vancefrosv3.rar"
1⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of WriteProcessMemory
PID:1944
- C:\Users\Admin\AppData\Local\Temp\7zO897C9F28\vancefrosv3.exe
  "C:\Users\Admin\AppData\Local\Temp\7zO897C9F28\vancefrosv3.exe"
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:628
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "vancefrosv3" /tr '"C:\Users\Admin\AppData\Roaming\vancefrosv3.exe"' & exit
    3⤵
    - Executes a command shell one-liner
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:3516
  - - C:\Windows\SysWOW64\schtasks.exe
      schtasks /create /f /sc onlogon /rl highest /tn "vancefrosv3" /tr '"C:\Users\Admin\AppData\Roaming\vancefrosv3.exe"'
      4⤵
      System Location Discovery: System Language Discovery
      Scheduled Task/Job: Scheduled Task
      PID:2104
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp9239.tmp.bat""
    3⤵
    - Executes a command shell one-liner
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:856
  - - C:\Windows\SysWOW64\timeout.exe
      timeout 3
      4⤵
      System Location Discovery: System Language Discovery
      Delays execution with timeout.exe
      PID:4212
  - - C:\Users\Admin\AppData\Roaming\vancefrosv3.exe
      "C:\Users\Admin\AppData\Roaming\vancefrosv3.exe"
      4⤵
      Executes dropped EXE
      System Location Discovery: System Language Discovery
      PID:828

C:\Users\Admin\AppData\Roaming\vancefrosv3.exe
"C:\Users\Admin\AppData\Roaming\vancefrosv3.exe"
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:3816

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

vancefrosv3.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\vancefrosv3.exe.log
Size 614B
SHA256 9ed5449a36700939987209c7a2974b9cc669b8b22c7c4e7936f35dda0a4dc359
MD5 54920f388010333559bdff225040761d
SHA1 040972bf1fc83014f10c45832322c094f883ce30
SHA512 e17aa5d1328b3bfd3754d15b3c2eded98653d90c7b326f941522e0b3bd6f557880246a6bc69047facb42eb97d2e0ed6c46148dfe95a98669fc4e1d07c21a285c
TLSH
T109F08B303722E1D88D522F521C2C7A9953EF078AB7A0DF2C7958536EDC26557AB211E3
MD5 SHA1 SHA512 TLSH

Submit Download

vancefrosv3.exe

Path C:\Users\Admin\AppData\Local\Temp\7zO897C9F28\vancefrosv3.exe
Size 47KB
SHA256 17ae97fac8318cb78ca3bd77f97b75bb4c9c8351992bd82dd505083d71e8f29d
MD5 68e4e26da3dd6e88ad765ce6d7f0591c
SHA1 e25844a708f77f81109cb2e9a3b30554fe375c7a
SHA512 b8186950a0db141720883d902172699acc9b739d1d2d854c7729bea2169d64cf43e2c0446e0db71e229be925b699c9f584f6f4c217605548087c4c2d115f2ecc
SSDEEP 768:Muifo9Tg4xr5WUx9tDmo2qr7BvgSuR4cfPIv6Qsc0btF2Q48KrITmtHJnNOJBDZ2:Muqo9Tg+L2wBv6RKv6QsPbtQQqc6H0d2
TLSH
T1A9233C0037E9816BF2BE4F78A9F2614546BBF1677603D54E2CC441D71B23BC29A426FA
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

tmp9239.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp9239.tmp.bat
Size 155B
SHA256 a76589cff4b9934af3ac23e871c09b957320d3d01365efee16eb2d5293782887
MD5 5cf4e7ee1713cce7a190380333313cb1
SHA1 84180745409f251943dd9c2ddae326d785aad31c
SHA512 ec13101ca3bc1d0cac16e7f9b5781bb3e13493e8cf5afe864e757de200301ce8bf6215105796fec6662b78627e0b17b55ccebe5f2d5d28d6ce8ec265f7dc6197
TLSH
T181C02B5356C6EA8E780614A346FAD49EA173AD2D3F44BFA0D704801D1280498F0E9342
MD5 SHA1 SHA512 TLSH

Submit Download

memory/628-12-0x0000000000ED0000-0x0000000000EE2000-memory.dmp

Download

memory/628-13-0x00000000058D0000-0x00000000058E0000-memory.dmp

Download

memory/628-14-0x0000000005860000-0x00000000058C6000-memory.dmp

Download

memory/628-15-0x0000000005D00000-0x0000000005D9C000-memory.dmp

Download

Resubmissions

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads