asyncrat | 0961e5f26a343a68db891eb8809da2a87f63159f255ae7e51d6aeba6b5146fd2

General

Target
aupyua.exe
Size 45KB
Sample260530-c6hmmsdv91
SHA256 0961e5f26a343a68db891eb8809da2a87f63159f255ae7e51d6aeba6b5146fd2
MD5 4366c2d9702f7f9b94be097bc8aed69f
SHA1 29cbac91dd4f40d54dafbcb6b47c2e6d462abc5f
SHA512 198f52af7493593a0ff45706ad2aefe8a837a3aacc7a022e8b28d891aa3d325d81a890bfc2f2e8d66181019f1a4bb2dbbcdd0934ab6e60e4bfe15ee80ea1ab28
SSDEEP 768:puNA/9T85LafWUzvSdmo2qIkZo3TMtPIQKjbdgX3iKa5P7QhPRBDZ7x:puNA/9T8p72oU3QGbKXSKwQhPvd7x
TLSH
T1D5231A003BE8812BF2BE5F7898F26245867AF2633603D54D2CC4519B5613FC69A427FE
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

vnsextop1.com:6606
vnsextop1.com:7707
vnsextop1.com:8808
vnsextop1.com:443
vnsextop1.com:80
malware.vnsextop1.com:6606
malware.vnsextop1.com:7707
malware.vnsextop1.com:8808
malware.vnsextop1.com:443
malware.vnsextop1.com:80
sex.vnsextop1.com:6606
sex.vnsextop1.com:7707
sex.vnsextop1.com:8808
sex.vnsextop1.com:443
sex.vnsextop1.com:80
rat.vnsextop1.com:6606
rat.vnsextop1.com:7707
rat.vnsextop1.com:8808
rat.vnsextop1.com:443
rat.vnsextop1.com:80

Mutex

ABfXQlsykTwq

Attributes

delay
3
install
true
install_file
aupyua.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
behavioral2/files/0x002300000002b3c1-8.dat	family_asyncrat

Executes dropped EXE 2 IoCs

pid	Process
3920	aupyua.exe
3736	aupyua.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	aupyua.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	aupyua.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	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	aupyua.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
2468	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
3232	schtasks.exe

Suspicious behavior: EnumeratesProcesses 19 IoCs

pid	Process
1196	aupyua.exe
1196	aupyua.exe
1196	aupyua.exe
1196	aupyua.exe
1196	aupyua.exe
1196	aupyua.exe
1196	aupyua.exe
1196	aupyua.exe
1196	aupyua.exe
1196	aupyua.exe
1196	aupyua.exe
1196	aupyua.exe
1196	aupyua.exe
1196	aupyua.exe
1196	aupyua.exe
1196	aupyua.exe
1196	aupyua.exe
1196	aupyua.exe
1196	aupyua.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1196	aupyua.exe
Token: SeDebugPrivilege	3920	aupyua.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 1196 wrote to memory of 2700	1196	aupyua.exe	80
PID 1196 wrote to memory of 2436	1196	aupyua.exe	82
PID 2700 wrote to memory of 3232	2700	cmd.exe	84
PID 2436 wrote to memory of 2468	2436	cmd.exe	85
PID 2436 wrote to memory of 3736	2436	cmd.exe	88

C:\Users\Admin\AppData\Local\Temp\aupyua.exe
"C:\Users\Admin\AppData\Local\Temp\aupyua.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1196
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "aupyua" /tr '"C:\Users\Admin\AppData\Roaming\aupyua.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2700
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "aupyua" /tr '"C:\Users\Admin\AppData\Roaming\aupyua.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:3232
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp52BF.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2436
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:2468
- - C:\Users\Admin\AppData\Roaming\aupyua.exe
    "C:\Users\Admin\AppData\Roaming\aupyua.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:3736

C:\Users\Admin\AppData\Roaming\aupyua.exe
"C:\Users\Admin\AppData\Roaming\aupyua.exe"
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:3920

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

System Information Discovery

1

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

aupyua.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\aupyua.exe.log
Size 522B
SHA256 3a8c487575696f7ace931dc220c85a47d33e0ead96aa9e47c705fee5dfac667a
MD5 db9f45365506c49961bfaf3be1475ad2
SHA1 6bd7222f7b7e3e9685207cb285091c92728168e4
SHA512 807028e2aed5b25b2d19ec4f09867746456de4e506c90c73e6730b35303511349a79ca0b9290509664edc0433d47e3fc7f2661534293ebb82185b1494da86a41
TLSH
T10DF09E303231B1D848023F42181C7A8942EF0746B7B8DF2D3650231EDC350176F212E3
MD5 SHA1 SHA512 TLSH

Submit Download

tmp52BF.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp52BF.tmp.bat
Size 150B
SHA256 c81084087927ad08c18b956fda23ec0ed98b4c3602633bea987c7acb9086ae3a
MD5 d87f269ac6ffaa8038f7e181b1cda242
SHA1 f931a9e2fc78b66dc17b3d1fed5e9728f08d6489
SHA512 1f175b973350a5b8c4c90ed95722097d45a25e492d01e5dab8dc3c9ca3fee208ea38034c54da8e47c4889dd323b98d0a298a451e161f88f12b5d858f517e8e47
TLSH
T1AAC02B4256C6FA1E690914D303FADA8C91B26C9E3F40FF00C348405E2281499F0DD349
MD5 SHA1 SHA512 TLSH

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aupyua.exe

Path C:\Users\Admin\AppData\Roaming\aupyua.exe
Size 45KB
SHA256 0961e5f26a343a68db891eb8809da2a87f63159f255ae7e51d6aeba6b5146fd2
MD5 4366c2d9702f7f9b94be097bc8aed69f
SHA1 29cbac91dd4f40d54dafbcb6b47c2e6d462abc5f
SHA512 198f52af7493593a0ff45706ad2aefe8a837a3aacc7a022e8b28d891aa3d325d81a890bfc2f2e8d66181019f1a4bb2dbbcdd0934ab6e60e4bfe15ee80ea1ab28
SSDEEP 768:puNA/9T85LafWUzvSdmo2qIkZo3TMtPIQKjbdgX3iKa5P7QhPRBDZ7x:puNA/9T8p72oU3QGbKXSKwQhPvd7x
TLSH
T1D5231A003BE8812BF2BE5F7898F26245867AF2633603D54D2CC4519B5613FC69A427FE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1196-0-0x0000000000FD0000-0x0000000000FE2000-memory.dmp

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memory/1196-1-0x0000000005A60000-0x0000000005A70000-memory.dmp

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memory/1196-2-0x0000000005A70000-0x0000000005B0C000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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