asyncrat | 727704989958642937c6bd8a84903b74a1fc1841e791c239a055573b0fe628c4

General

Target

client.exe
Size

47KB
MD5

c8d7a1fbf24efd3a9ef031b81a4fbdcb
SHA1

1147ff4e42c33ce3795422d3309f83e3460dba6b
SHA256

727704989958642937c6bd8a84903b74a1fc1841e791c239a055573b0fe628c4
SHA512

b6c5415e31aef5acd04ccb969916f2184232bcbcca9a5f691eb4cb79e9f40cba8e3ca53d55cba072e34165b1e8ad55564f2121540d178a76165d866a8279bd6a
SSDEEP

768:YuW01Towx/9WU9mp+Xmo2qzQh+JRVLiCPIsAKjILU0bu0kv/TRTXfuO6fcIuyvBQ:YuW01ToqEO2MLliLsAKjEbu0a/TRbWOt

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

127.0.0.1:4444

70.104.186.131:6606

70.104.186.131:7707

70.104.186.131:8808

70.104.186.131:4444

Mutex

P7nH82MyXxoq

Attributes

delay
3
install
true
install_file
windowsappsec.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
behavioral2/files/0x000b000000023b65-12.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-1-5-21-3227495264-2217614367-4027411560-1000\Control Panel\International\Geo\Nation	client.exe

Executes dropped EXE 1 IoCs

pid	Process
3436	windowsappsec.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	client.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	windowsappsec.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
4024	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
3908	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
4376	client.exe
4376	client.exe
4376	client.exe
4376	client.exe
4376	client.exe
4376	client.exe
4376	client.exe
4376	client.exe
4376	client.exe
4376	client.exe
4376	client.exe
4376	client.exe
4376	client.exe
4376	client.exe
4376	client.exe
4376	client.exe
4376	client.exe
4376	client.exe
4376	client.exe
4376	client.exe
4376	client.exe
4376	client.exe
4376	client.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	4376	client.exe
Token: SeDebugPrivilege	3436	windowsappsec.exe
Token: SeDebugPrivilege	3436	windowsappsec.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4376 wrote to memory of 4616	4376	client.exe	83
PID 4376 wrote to memory of 4616	4376	client.exe	83
PID 4376 wrote to memory of 4616	4376	client.exe	83
PID 4376 wrote to memory of 1416	4376	client.exe	85
PID 4376 wrote to memory of 1416	4376	client.exe	85
PID 4376 wrote to memory of 1416	4376	client.exe	85
PID 1416 wrote to memory of 4024	1416	cmd.exe	87
PID 1416 wrote to memory of 4024	1416	cmd.exe	87
PID 1416 wrote to memory of 4024	1416	cmd.exe	87
PID 4616 wrote to memory of 3908	4616	cmd.exe	88
PID 4616 wrote to memory of 3908	4616	cmd.exe	88
PID 4616 wrote to memory of 3908	4616	cmd.exe	88
PID 1416 wrote to memory of 3436	1416	cmd.exe	89
PID 1416 wrote to memory of 3436	1416	cmd.exe	89
PID 1416 wrote to memory of 3436	1416	cmd.exe	89

C:\Users\Admin\AppData\Local\Temp\client.exe
"C:\Users\Admin\AppData\Local\Temp\client.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4376
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "windowsappsec" /tr '"C:\Users\Admin\AppData\Roaming\windowsappsec.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4616
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "windowsappsec" /tr '"C:\Users\Admin\AppData\Roaming\windowsappsec.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:3908
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpB2F4.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1416
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:4024
- - C:\Users\Admin\AppData\Roaming\windowsappsec.exe
    "C:\Users\Admin\AppData\Roaming\windowsappsec.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:3436

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

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmpB2F4.tmp.bat

Filesize
157B

MD5
72e4ef2f1e275978399699c9bfc80b9c

SHA1
b81d5f3bf9475c78c80db0055e930a805a8059e0

SHA256
f789e4531ea9da83bce75c2a9e5f253718f39fdbc4a0345f6b41547ceb3af589

SHA512
2a3fc010887273a0d9f758ee6ff8b6427e5d6dbfd4ec2353ab82de73c9c288a67b3c599fd3e7069fdc0de117a06b654e20b470aefebc7acdcf4ab73da4433f06

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

Filesize
47KB

MD5
c8d7a1fbf24efd3a9ef031b81a4fbdcb

SHA1
1147ff4e42c33ce3795422d3309f83e3460dba6b

SHA256
727704989958642937c6bd8a84903b74a1fc1841e791c239a055573b0fe628c4

SHA512
b6c5415e31aef5acd04ccb969916f2184232bcbcca9a5f691eb4cb79e9f40cba8e3ca53d55cba072e34165b1e8ad55564f2121540d178a76165d866a8279bd6a

Download Submit
memory/3436-14-0x00000000752C0000-0x0000000075A70000-memory.dmp

Filesize
7.7MB

Download
memory/3436-15-0x00000000752C0000-0x0000000075A70000-memory.dmp

Filesize
7.7MB

Download
memory/4376-0-0x000000007537E000-0x000000007537F000-memory.dmp

Filesize
4KB

Download
memory/4376-1-0x0000000000670000-0x0000000000682000-memory.dmp

Filesize
72KB

Download
memory/4376-2-0x0000000075370000-0x0000000075B20000-memory.dmp

Filesize
7.7MB

Download
memory/4376-3-0x0000000004FF0000-0x0000000005056000-memory.dmp

Filesize
408KB

Download
memory/4376-4-0x0000000005500000-0x000000000559C000-memory.dmp

Filesize
624KB

Download
memory/4376-9-0x0000000075370000-0x0000000075B20000-memory.dmp

Filesize
7.7MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads