asyncrat | b89c64e6cb8ac56910849b3340322f3ed1aa77be3aee2a9e081ff08819ce43bd

General

Target

AsyncClient.exe
Size

47KB
MD5

678c7b99496c1e045a6f8a7072f41902
SHA1

fbc4bf034a1d4b0b7f0777da3dbf63ba2ea7d5de
SHA256

b89c64e6cb8ac56910849b3340322f3ed1aa77be3aee2a9e081ff08819ce43bd
SHA512

ac152cb621f2503178f82dfca62816cb13c91551c3f0c181c245117b3a1e2d9dbe022dce109f8e192d74e31c251a857770974f03c5f2b528017fe66e79195fc6
SSDEEP

768:QuYH9T3kH1jWUvTqRmo2qbcrFgnNyGzYk5PIqPESVOs0bXbva5XPfG1tRulaADVg:QuYH9T34y2nFg7X2qPJEbDatPfG1tRue

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

Mutex

juGfnQMxS4Ze

Attributes

delay
3
install
true
install_file
Sync.exe
install_folder
%AppData%
pastebin_config
https://pastebin.com/raw/s14cUU5G

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

Processes:

resource	yara_rule
\Users\Admin\AppData\Roaming\Sync.exe	family_asyncrat

Executes dropped EXE 1 IoCs

Processes:

Sync.exe

pid process

2796 Sync.exe
Loads dropped DLL 1 IoCs

Processes:

cmd.exe

pid process

2356 cmd.exe
Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service
T1102

Processes:

flow ioc

4 pastebin.com
5 pastebin.com
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

pid	process
2796	Sync.exe

pid	process
2356	cmd.exe

flow	ioc
4	pastebin.com
5	pastebin.com

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

Processes:

timeout.exeSync.exeAsyncClient.execmd.execmd.exeschtasks.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Sync.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	AsyncClient.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

Delays execution with timeout.exe 1 IoCs
evasion

Processes:

timeout.exe

pid process

2780 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

Processes:

schtasks.exe

pid process

2884 schtasks.exe
Suspicious behavior: EnumeratesProcesses 3 IoCs

Processes:

AsyncClient.exe

pid process

2568 AsyncClient.exe
2568 AsyncClient.exe
2568 AsyncClient.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

AsyncClient.exeSync.exe

description pid process

Token: SeDebugPrivilege 2568 AsyncClient.exe
Token: SeDebugPrivilege 2796 Sync.exe

pid	process
2780	timeout.exe

pid	process
2884	schtasks.exe

pid	process
2568	AsyncClient.exe
2568	AsyncClient.exe
2568	AsyncClient.exe

description	pid	process
Token: SeDebugPrivilege	2568	AsyncClient.exe
Token: SeDebugPrivilege	2796	Sync.exe

Suspicious use of WriteProcessMemory 20 IoCs

Processes:

AsyncClient.execmd.execmd.exe

description	pid	process	target process
PID 2568 wrote to memory of 1704	2568	AsyncClient.exe	cmd.exe
PID 2568 wrote to memory of 1704	2568	AsyncClient.exe	cmd.exe
PID 2568 wrote to memory of 1704	2568	AsyncClient.exe	cmd.exe
PID 2568 wrote to memory of 1704	2568	AsyncClient.exe	cmd.exe
PID 2568 wrote to memory of 2356	2568	AsyncClient.exe	cmd.exe
PID 2568 wrote to memory of 2356	2568	AsyncClient.exe	cmd.exe
PID 2568 wrote to memory of 2356	2568	AsyncClient.exe	cmd.exe
PID 2568 wrote to memory of 2356	2568	AsyncClient.exe	cmd.exe
PID 1704 wrote to memory of 2884	1704	cmd.exe	schtasks.exe
PID 1704 wrote to memory of 2884	1704	cmd.exe	schtasks.exe
PID 1704 wrote to memory of 2884	1704	cmd.exe	schtasks.exe
PID 1704 wrote to memory of 2884	1704	cmd.exe	schtasks.exe
PID 2356 wrote to memory of 2780	2356	cmd.exe	timeout.exe
PID 2356 wrote to memory of 2780	2356	cmd.exe	timeout.exe
PID 2356 wrote to memory of 2780	2356	cmd.exe	timeout.exe
PID 2356 wrote to memory of 2780	2356	cmd.exe	timeout.exe
PID 2356 wrote to memory of 2796	2356	cmd.exe	Sync.exe
PID 2356 wrote to memory of 2796	2356	cmd.exe	Sync.exe
PID 2356 wrote to memory of 2796	2356	cmd.exe	Sync.exe
PID 2356 wrote to memory of 2796	2356	cmd.exe	Sync.exe

C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe
"C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2568
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "Sync" /tr '"C:\Users\Admin\AppData\Roaming\Sync.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1704
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "Sync" /tr '"C:\Users\Admin\AppData\Roaming\Sync.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:2884
- C:\Windows\SysWOW64\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpC17B.tmp.bat""
  2⤵
  - Loads dropped DLL
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2356
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:2780
- - C:\Users\Admin\AppData\Roaming\Sync.exe
    "C:\Users\Admin\AppData\Roaming\Sync.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:2796

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

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Web Service

1

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmpC17B.tmp.bat

Filesize
148B

MD5
0d5a2d1cd74fb74bef0cdb8864a95eef

SHA1
5823f637e0102fd8ed334fe8855cbc0db3e85dca

SHA256
6e52962c986ae08791fb8f51ba759f9602fbca05e07cad18a0d7cdfcc054c65e

SHA512
c55415b06d75b57c0e4218b4a971f39602ce468b27148413705035b5176e9aa47c47ca857ee87dbfef8fcc51b690df10ed65567761363f51f4163c6c75b749a5

Download Submit
\Users\Admin\AppData\Roaming\Sync.exe

Filesize
47KB

MD5
678c7b99496c1e045a6f8a7072f41902

SHA1
fbc4bf034a1d4b0b7f0777da3dbf63ba2ea7d5de

SHA256
b89c64e6cb8ac56910849b3340322f3ed1aa77be3aee2a9e081ff08819ce43bd

SHA512
ac152cb621f2503178f82dfca62816cb13c91551c3f0c181c245117b3a1e2d9dbe022dce109f8e192d74e31c251a857770974f03c5f2b528017fe66e79195fc6

Download Submit
memory/2568-0-0x00000000747EE000-0x00000000747EF000-memory.dmp

Filesize
4KB

Download
memory/2568-1-0x0000000001360000-0x0000000001372000-memory.dmp

Filesize
72KB

Download
memory/2568-2-0x00000000747E0000-0x0000000074ECE000-memory.dmp

Filesize
6.9MB

Download
memory/2568-11-0x00000000747E0000-0x0000000074ECE000-memory.dmp

Filesize
6.9MB

Download
memory/2796-16-0x0000000001300000-0x0000000001312000-memory.dmp

Filesize
72KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads