asyncrat | b0f42cd37d2b43303ff4c3650b08874091e5befee8c8df1146ca938940d7c924

General

Target

HomeBrewXSS.exe
Size

47KB
MD5

0d1a0f08224bb93658a44a322f8ba885
SHA1

918b7e6b2ac0f955f72a868cec8090535313a0d8
SHA256

b0f42cd37d2b43303ff4c3650b08874091e5befee8c8df1146ca938940d7c924
SHA512

7b99f32f2b83fa626448292628e1a166838113d3695bf41761d943409ba5374fcdf565eea4691819084e30a5864e54d36af096f4a7152545559d98c96a31687d
SSDEEP

768:CuACNTHkvSbWUnwKJmo2q7U+Nc2ILoPIsZmUkNO00bagzXayuwlYjmkmiEBDZkx:CuACNTHge2kILNsZmUkNO3bagDap6uyU

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.7B

Botnet

Default

C2

127.0.0.1:6606

127.0.0.1:7707

127.0.0.1:8808

Mutex

AsyncMutex_6SI8OkPnk

Attributes

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

aes.plain

Signatures

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

Async RAT payload 1 IoCs

rat

Processes:

resource	yara_rule
C:\Users\Admin\AppData\Roaming\HomeBrewX_ServerSide.exe	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

Processes:

HomeBrewXSS.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-945322488-2060912225-3527527000-1000\Control Panel\International\Geo\Nation	HomeBrewXSS.exe

Executes dropped EXE 1 IoCs

Processes:

HomeBrewX_ServerSide.exe

pid process

4588 HomeBrewX_ServerSide.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

pid	process
4588	HomeBrewX_ServerSide.exe

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:

cmd.execmd.exeschtasks.exetimeout.exeHomeBrewX_ServerSide.exeHomeBrewXSS.exe

description	ioc	process
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	HomeBrewX_ServerSide.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	HomeBrewXSS.exe

Delays execution with timeout.exe 1 IoCs
evasion

Processes:

timeout.exe

pid process

768 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

2724 schtasks.exe

pid	process
768	timeout.exe

pid	process
2724	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

Processes:

HomeBrewXSS.exe

pid	process
4420	HomeBrewXSS.exe
4420	HomeBrewXSS.exe
4420	HomeBrewXSS.exe
4420	HomeBrewXSS.exe
4420	HomeBrewXSS.exe
4420	HomeBrewXSS.exe
4420	HomeBrewXSS.exe
4420	HomeBrewXSS.exe
4420	HomeBrewXSS.exe
4420	HomeBrewXSS.exe
4420	HomeBrewXSS.exe
4420	HomeBrewXSS.exe
4420	HomeBrewXSS.exe
4420	HomeBrewXSS.exe
4420	HomeBrewXSS.exe
4420	HomeBrewXSS.exe
4420	HomeBrewXSS.exe
4420	HomeBrewXSS.exe
4420	HomeBrewXSS.exe
4420	HomeBrewXSS.exe
4420	HomeBrewXSS.exe
4420	HomeBrewXSS.exe
4420	HomeBrewXSS.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

HomeBrewXSS.exeHomeBrewX_ServerSide.exe

description	pid	process
Token: SeDebugPrivilege	4420	HomeBrewXSS.exe
Token: SeDebugPrivilege	4588	HomeBrewX_ServerSide.exe
Token: SeDebugPrivilege	4588	HomeBrewX_ServerSide.exe

Suspicious use of WriteProcessMemory 15 IoCs

Processes:

HomeBrewXSS.execmd.execmd.exe

description	pid	process	target process
PID 4420 wrote to memory of 2060	4420	HomeBrewXSS.exe	cmd.exe
PID 4420 wrote to memory of 2060	4420	HomeBrewXSS.exe	cmd.exe
PID 4420 wrote to memory of 2060	4420	HomeBrewXSS.exe	cmd.exe
PID 4420 wrote to memory of 2652	4420	HomeBrewXSS.exe	cmd.exe
PID 4420 wrote to memory of 2652	4420	HomeBrewXSS.exe	cmd.exe
PID 4420 wrote to memory of 2652	4420	HomeBrewXSS.exe	cmd.exe
PID 2060 wrote to memory of 2724	2060	cmd.exe	schtasks.exe
PID 2060 wrote to memory of 2724	2060	cmd.exe	schtasks.exe
PID 2060 wrote to memory of 2724	2060	cmd.exe	schtasks.exe
PID 2652 wrote to memory of 768	2652	cmd.exe	timeout.exe
PID 2652 wrote to memory of 768	2652	cmd.exe	timeout.exe
PID 2652 wrote to memory of 768	2652	cmd.exe	timeout.exe
PID 2652 wrote to memory of 4588	2652	cmd.exe	HomeBrewX_ServerSide.exe
PID 2652 wrote to memory of 4588	2652	cmd.exe	HomeBrewX_ServerSide.exe
PID 2652 wrote to memory of 4588	2652	cmd.exe	HomeBrewX_ServerSide.exe

C:\Users\Admin\AppData\Local\Temp\HomeBrewXSS.exe
"C:\Users\Admin\AppData\Local\Temp\HomeBrewXSS.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4420

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "HomeBrewX_ServerSide" /tr '"C:\Users\Admin\AppData\Roaming\HomeBrewX_ServerSide.exe"' & exit
2⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2060

C:\Windows\SysWOW64\schtasks.exe
schtasks /create /f /sc onlogon /rl highest /tn "HomeBrewX_ServerSide" /tr '"C:\Users\Admin\AppData\Roaming\HomeBrewX_ServerSide.exe"'
3⤵
- System Location Discovery: System Language Discovery
- Scheduled Task/Job: Scheduled Task
PID:2724

C:\Windows\SysWOW64\cmd.exe
C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpC7D4.tmp.bat""
2⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2652

C:\Windows\SysWOW64\timeout.exe
timeout 3
3⤵
- System Location Discovery: System Language Discovery
- Delays execution with timeout.exe
PID:768

C:\Users\Admin\AppData\Roaming\HomeBrewX_ServerSide.exe
"C:\Users\Admin\AppData\Roaming\HomeBrewX_ServerSide.exe"
3⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:4588

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\tmpC7D4.tmp.bat

Filesize
164B

MD5
5b704c0b21f10eea5db3bb5317794e5a

SHA1
317e3a6d32cf6caab1c32e4c7a2dd72e7ac2b826

SHA256
f9107c27206785afbc0724dfda77b54b56e88fed128ea4d3b07e81d928851478

SHA512
fd6e5da43a87f33171e8697dec9b1214b142f4d18598170fee4b09f6048d74b8d28d38f4092c6f4e762f3b05ef82ffb2232cfdcb7d54ca27c4d5473eb1c97161

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

Filesize
47KB

MD5
0d1a0f08224bb93658a44a322f8ba885

SHA1
918b7e6b2ac0f955f72a868cec8090535313a0d8

SHA256
b0f42cd37d2b43303ff4c3650b08874091e5befee8c8df1146ca938940d7c924

SHA512
7b99f32f2b83fa626448292628e1a166838113d3695bf41761d943409ba5374fcdf565eea4691819084e30a5864e54d36af096f4a7152545559d98c96a31687d

Download Submit
memory/4420-0-0x000000007517E000-0x000000007517F000-memory.dmp

Filesize
4KB

Download
memory/4420-1-0x0000000000EE0000-0x0000000000EF2000-memory.dmp

Filesize
72KB

Download
memory/4420-2-0x0000000075170000-0x0000000075920000-memory.dmp

Filesize
7.7MB

Download
memory/4420-3-0x00000000058E0000-0x0000000005946000-memory.dmp

Filesize
408KB

Download
memory/4420-4-0x0000000005D30000-0x0000000005DCC000-memory.dmp

Filesize
624KB

Download
memory/4420-9-0x0000000075170000-0x0000000075920000-memory.dmp

Filesize
7.7MB

Download
memory/4588-14-0x00000000750F0000-0x00000000758A0000-memory.dmp

Filesize
7.7MB

Download
memory/4588-15-0x00000000750F0000-0x00000000758A0000-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