asyncrat | a4d68abab530b30e8060ef2ded1bc57036ca53be7c3b5fbfdf62f65640ef82d9

General

Target

nezur.exe
Size

47KB
MD5

60ea224fad8adf65358117a39a4bd365
SHA1

1eb47f8bc6d41ef26915e1f5292a830b4060dd67
SHA256

a4d68abab530b30e8060ef2ded1bc57036ca53be7c3b5fbfdf62f65640ef82d9
SHA512

2ea92e0abaa49537eca5d6f834275679e02c426d68c29298118f2202a11798209a013ab82caaca1670d6192886945137af31b96ed91e6b654f04849dba9c1800
SSDEEP

768:IuGE1THwoPNWUtHT1MHmo2qz79WjIDfWEs7PIILiU0bMusLmNzg5DhcA5Avfc5nK:IuGE1THbF1m2MXfrILwbDsw05DhDa4nK

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

127.0.0.1:8808

127.0.0.1:55112

147.185.221.23:6606

147.185.221.23:7707

147.185.221.23:8808

147.185.221.23:55112

Mutex

YdG4sJsjPfA4

Attributes

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

aes.plain

Signatures

AsyncRat
AsyncRAT is designed to remotely monitor and control other computers written in C#.
rat asyncrat
Asyncrat family
asyncrat

Async RAT payload 1 IoCs

rat

resource	yara_rule
behavioral1/files/0x00280000000450c9-11.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-1-5-21-1361837696-2276465416-1936241636-1000\Control Panel\International\Geo\Nation	nezur.exe

Executes dropped EXE 1 IoCs

pid	Process
1460	nezur.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	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	nezur.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	nezur.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	cmd.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
1052	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
3580	schtasks.exe

Suspicious behavior: EnumeratesProcesses 21 IoCs

pid	Process
1412	nezur.exe
1412	nezur.exe
1412	nezur.exe
1412	nezur.exe
1412	nezur.exe
1412	nezur.exe
1412	nezur.exe
1412	nezur.exe
1412	nezur.exe
1412	nezur.exe
1412	nezur.exe
1412	nezur.exe
1412	nezur.exe
1412	nezur.exe
1412	nezur.exe
1412	nezur.exe
1412	nezur.exe
1412	nezur.exe
1412	nezur.exe
1412	nezur.exe
1412	nezur.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1412	nezur.exe
Token: SeDebugPrivilege	1460	nezur.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 1412 wrote to memory of 1632	1412	nezur.exe	87
PID 1412 wrote to memory of 1632	1412	nezur.exe	87
PID 1412 wrote to memory of 1632	1412	nezur.exe	87
PID 1412 wrote to memory of 3848	1412	nezur.exe	88
PID 1412 wrote to memory of 3848	1412	nezur.exe	88
PID 1412 wrote to memory of 3848	1412	nezur.exe	88
PID 3848 wrote to memory of 1052	3848	cmd.exe	91
PID 3848 wrote to memory of 1052	3848	cmd.exe	91
PID 3848 wrote to memory of 1052	3848	cmd.exe	91
PID 1632 wrote to memory of 3580	1632	cmd.exe	92
PID 1632 wrote to memory of 3580	1632	cmd.exe	92
PID 1632 wrote to memory of 3580	1632	cmd.exe	92
PID 3848 wrote to memory of 1460	3848	cmd.exe	94
PID 3848 wrote to memory of 1460	3848	cmd.exe	94
PID 3848 wrote to memory of 1460	3848	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\nezur.exe
"C:\Users\Admin\AppData\Local\Temp\nezur.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1412
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "nezur" /tr '"C:\Users\Admin\AppData\Roaming\nezur.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1632
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "nezur" /tr '"C:\Users\Admin\AppData\Roaming\nezur.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:3580
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpCCB6.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3848
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:1052
- - C:\Users\Admin\AppData\Roaming\nezur.exe
    "C:\Users\Admin\AppData\Roaming\nezur.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:1460

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

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\nezur.exe.log

Filesize
522B

MD5
00da7f1e650af65ee27f2c786561d83b

SHA1
071e8622f304964d2350202c1ca9db34d71d29e9

SHA256
706d2dc5cd3f617834859782684b201a324ed5e8edc9bdea38e886341c931776

SHA512
ae22913cafaf59eee00c2775a9c29d110e11b8f9732c9c2ad69acc30f95d59d983ff269d31a5747aff8971bcde31f83fb40dc6a3656ab3d272f35c194bb90b12

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpCCB6.tmp.bat

Filesize
149B

MD5
86982d353bc1c9996b9babd4dc5ad4f8

SHA1
97291e090120e73182143c673f9f240f2dc854ae

SHA256
ed7a6a646ceb7253fc70d66d838abf0fab2e1e4c47cbcefd0314cb11c2b4a459

SHA512
07e21f260a570608b6a1341bda173119db39a7aece9f6e1e0b885cfed136cf8bcda7617911b9e745e26ebb49d43bf6dbde9ec89051efa11bff5414ab9d275735

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

Filesize
47KB

MD5
60ea224fad8adf65358117a39a4bd365

SHA1
1eb47f8bc6d41ef26915e1f5292a830b4060dd67

SHA256
a4d68abab530b30e8060ef2ded1bc57036ca53be7c3b5fbfdf62f65640ef82d9

SHA512
2ea92e0abaa49537eca5d6f834275679e02c426d68c29298118f2202a11798209a013ab82caaca1670d6192886945137af31b96ed91e6b654f04849dba9c1800

Download Submit
memory/1412-0-0x0000000074D3E000-0x0000000074D3F000-memory.dmp

Filesize
4KB

Download
memory/1412-1-0x0000000000DC0000-0x0000000000DD2000-memory.dmp

Filesize
72KB

Download
memory/1412-2-0x0000000074D30000-0x00000000754E1000-memory.dmp

Filesize
7.7MB

Download
memory/1412-3-0x00000000057E0000-0x000000000587C000-memory.dmp

Filesize
624KB

Download
memory/1412-8-0x0000000074D30000-0x00000000754E1000-memory.dmp

Filesize
7.7MB

Download
memory/1460-14-0x0000000074D30000-0x00000000754E1000-memory.dmp

Filesize
7.7MB

Download
memory/1460-15-0x0000000074D30000-0x00000000754E1000-memory.dmp

Filesize
7.7MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads