asyncrat | 6cf4a579623b42f2218ea16f6db3bfce6da858dac5db1cfda9a814e595d1dc5d

General

Target
6cf4a579623b42f2218ea16f6db3bfce6da858dac5db1cfda9a814e595d1dc5d.exe
Size 45KB
Sample260804-kejdvs1set
SHA256 6cf4a579623b42f2218ea16f6db3bfce6da858dac5db1cfda9a814e595d1dc5d
MD5 92540a7fa5b0a4980d9844cd97e0f95f
SHA1 bf1632a75e0eb0890fab0f94fed73ffaf2968862
SHA512 2b7100bbddfcc4606858cee31d5ab24cef6f58f2f079e43b78576636db23fef9bf716055020da32ece50bfc612beb4b20467eefed4f8134a796acec31c210b70
SSDEEP 768:0uPrpT/LGKeWUszuAmo2q97wz/y3qiPIUzjbtgX3igf2pHMQ9F7aqBDZ8x:0uPrpT/qY2Y0hU3b6XSp5MQG0d8x
TLSH
T1F8231A003BE9812BF2BE4B789DF26145467AF6633A03D6891CC411DB5713BC69A426FE
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

default command_and_control defense_evasion discovery execution asyncrat persistence rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

fimsexvietnam.com:80
fimsexvietnam.com:22
fimsexvietnam.com:8080
fimsexvietnam.com:8880
fimsexvietnam.com:2052
fimsexvietnam.com:2082
fimsexvietnam.com:2086
fimsexvietnam.com:2095
fimsexvietnam.com:443
fimsexvietnam.com:2053
fimsexvietnam.com:2083
fimsexvietnam.com:2087
fimsexvietnam.com:2096
fimsexvietnam.com:8443
www.fimsexvietnam.com:80
www.fimsexvietnam.com:22
www.fimsexvietnam.com:8080
www.fimsexvietnam.com:8880
www.fimsexvietnam.com:2052
www.fimsexvietnam.com:2082
www.fimsexvietnam.com:2086
www.fimsexvietnam.com:2095
www.fimsexvietnam.com:443
www.fimsexvietnam.com:2053
www.fimsexvietnam.com:2083
www.fimsexvietnam.com:2087
www.fimsexvietnam.com:2096
www.fimsexvietnam.com:8443
revil.fimsexvietnam.com:80
revil.fimsexvietnam.com:22
revil.fimsexvietnam.com:8080
revil.fimsexvietnam.com:8880
revil.fimsexvietnam.com:2052
revil.fimsexvietnam.com:2082
revil.fimsexvietnam.com:2086
revil.fimsexvietnam.com:2095
revil.fimsexvietnam.com:443
revil.fimsexvietnam.com:2053
revil.fimsexvietnam.com:2083
revil.fimsexvietnam.com:2087
revil.fimsexvietnam.com:2096
revil.fimsexvietnam.com:8443
nanocore.fimsexvietnam.com:80
nanocore.fimsexvietnam.com:22
nanocore.fimsexvietnam.com:8080
nanocore.fimsexvietnam.com:8880
nanocore.fimsexvietnam.com:2052
nanocore.fimsexvietnam.com:2082
nanocore.fimsexvietnam.com:2086
nanocore.fimsexvietnam.com:2095
nanocore.fimsexvietnam.com:443
nanocore.fimsexvietnam.com:2053
nanocore.fimsexvietnam.com:2083
nanocore.fimsexvietnam.com:2087
nanocore.fimsexvietnam.com:2096
nanocore.fimsexvietnam.com:8443

Mutex

m46eMJIiQXHv

Attributes

delay
0
install
true
install_file
wcb8ed0.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
behavioral1/files/0x000300000001e69b-8.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-1-5-21-2937465464-4167303362-2236413517-1000\Control Panel\International\Geo\Nation	6cf4a579623b42f2218ea16f6db3bfce6da858dac5db1cfda9a814e595d1dc5d.exe

Executes dropped EXE 2 IoCs

pid	Process
5004	wcb8ed0.exe
4088	wcb8ed0.exe

Outbound SSH connection to public host 2 TTPs 4 IoCs

SSH is used for remote access. This may indicate SSH host discovery, encrypted C2 traffic, or data exfiltration.

command_and_control

Protocol Tunneling

T1572

Network Service Discovery

T1046

description	flow	ioc	pid	Process
SSH destination	12	104.21.36.7:22	5004	wcb8ed0.exe
SSH destination	16	172.67.182.173:22	5004	wcb8ed0.exe
SSH destination	22	104.21.36.7:22	5004	wcb8ed0.exe
SSH destination	36	172.67.182.173:22	5004	wcb8ed0.exe

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

System Information Discovery
T1082

Executes a command shell one-liner 1 TTPs 2 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
4076	cmd.exe
4104	cmd.exe

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	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	wcb8ed0.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	wcb8ed0.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	6cf4a579623b42f2218ea16f6db3bfce6da858dac5db1cfda9a814e595d1dc5d.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
556	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
3440	schtasks.exe

Suspicious behavior: EnumeratesProcesses 21 IoCs

pid	Process
784	6cf4a579623b42f2218ea16f6db3bfce6da858dac5db1cfda9a814e595d1dc5d.exe
784	6cf4a579623b42f2218ea16f6db3bfce6da858dac5db1cfda9a814e595d1dc5d.exe
784	6cf4a579623b42f2218ea16f6db3bfce6da858dac5db1cfda9a814e595d1dc5d.exe
784	6cf4a579623b42f2218ea16f6db3bfce6da858dac5db1cfda9a814e595d1dc5d.exe
784	6cf4a579623b42f2218ea16f6db3bfce6da858dac5db1cfda9a814e595d1dc5d.exe
784	6cf4a579623b42f2218ea16f6db3bfce6da858dac5db1cfda9a814e595d1dc5d.exe
784	6cf4a579623b42f2218ea16f6db3bfce6da858dac5db1cfda9a814e595d1dc5d.exe
784	6cf4a579623b42f2218ea16f6db3bfce6da858dac5db1cfda9a814e595d1dc5d.exe
784	6cf4a579623b42f2218ea16f6db3bfce6da858dac5db1cfda9a814e595d1dc5d.exe
784	6cf4a579623b42f2218ea16f6db3bfce6da858dac5db1cfda9a814e595d1dc5d.exe
784	6cf4a579623b42f2218ea16f6db3bfce6da858dac5db1cfda9a814e595d1dc5d.exe
784	6cf4a579623b42f2218ea16f6db3bfce6da858dac5db1cfda9a814e595d1dc5d.exe
784	6cf4a579623b42f2218ea16f6db3bfce6da858dac5db1cfda9a814e595d1dc5d.exe
784	6cf4a579623b42f2218ea16f6db3bfce6da858dac5db1cfda9a814e595d1dc5d.exe
784	6cf4a579623b42f2218ea16f6db3bfce6da858dac5db1cfda9a814e595d1dc5d.exe
784	6cf4a579623b42f2218ea16f6db3bfce6da858dac5db1cfda9a814e595d1dc5d.exe
784	6cf4a579623b42f2218ea16f6db3bfce6da858dac5db1cfda9a814e595d1dc5d.exe
784	6cf4a579623b42f2218ea16f6db3bfce6da858dac5db1cfda9a814e595d1dc5d.exe
784	6cf4a579623b42f2218ea16f6db3bfce6da858dac5db1cfda9a814e595d1dc5d.exe
784	6cf4a579623b42f2218ea16f6db3bfce6da858dac5db1cfda9a814e595d1dc5d.exe
784	6cf4a579623b42f2218ea16f6db3bfce6da858dac5db1cfda9a814e595d1dc5d.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	784	6cf4a579623b42f2218ea16f6db3bfce6da858dac5db1cfda9a814e595d1dc5d.exe
Token: SeDebugPrivilege	5004	wcb8ed0.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 784 wrote to memory of 4076	784	6cf4a579623b42f2218ea16f6db3bfce6da858dac5db1cfda9a814e595d1dc5d.exe	85
PID 784 wrote to memory of 4104	784	6cf4a579623b42f2218ea16f6db3bfce6da858dac5db1cfda9a814e595d1dc5d.exe	87
PID 4076 wrote to memory of 3440	4076	cmd.exe	89
PID 4104 wrote to memory of 556	4104	cmd.exe	90
PID 4104 wrote to memory of 4088	4104	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\6cf4a579623b42f2218ea16f6db3bfce6da858dac5db1cfda9a814e595d1dc5d.exe
"C:\Users\Admin\AppData\Local\Temp\6cf4a579623b42f2218ea16f6db3bfce6da858dac5db1cfda9a814e595d1dc5d.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:784
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "wcb8ed0" /tr '"C:\Users\Admin\AppData\Roaming\wcb8ed0.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4076
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "wcb8ed0" /tr '"C:\Users\Admin\AppData\Roaming\wcb8ed0.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:3440
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpD7B3.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4104
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:556
- - C:\Users\Admin\AppData\Roaming\wcb8ed0.exe
    "C:\Users\Admin\AppData\Roaming\wcb8ed0.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:4088

C:\Users\Admin\AppData\Roaming\wcb8ed0.exe
"C:\Users\Admin\AppData\Roaming\wcb8ed0.exe"
1⤵
- Executes dropped EXE
- Outbound SSH connection to public host
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:5004

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Windows Command Shell

1

T1059.003

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

Network Service Discovery

Query Registry

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Protocol Tunneling

1

T1572

Exfiltration

Impact

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Downloads

tmpD7B3.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmpD7B3.tmp.bat
Size 151B
SHA256 016f686b7d28b00ea18d3b70fc41a1bad5ce8d70cfaec3f462762467297a15f7
MD5 3a3bcd8cb20bd9c2ca7a82c172f2ce99
SHA1 b6d2dc0e8e310cac93bab70df8e00b0672d38909
SHA512 5dee4bd2e115852d0093e421f3ccd456bc396803e99ce7969b82f28071f6862ded0e58d6147887d4bb506af372d9e012312ece691af56397a57f6f07d06cdbf4
TLSH
T1CAC08C5251C5EA1E7805981306BA968EA1A669693E40AB20C30484099280458E49A345
MD5 SHA1 SHA512 TLSH

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wcb8ed0.exe

Path C:\Users\Admin\AppData\Roaming\wcb8ed0.exe
Size 45KB
SHA256 6cf4a579623b42f2218ea16f6db3bfce6da858dac5db1cfda9a814e595d1dc5d
MD5 92540a7fa5b0a4980d9844cd97e0f95f
SHA1 bf1632a75e0eb0890fab0f94fed73ffaf2968862
SHA512 2b7100bbddfcc4606858cee31d5ab24cef6f58f2f079e43b78576636db23fef9bf716055020da32ece50bfc612beb4b20467eefed4f8134a796acec31c210b70
SSDEEP 768:0uPrpT/LGKeWUszuAmo2q97wz/y3qiPIUzjbtgX3igf2pHMQ9F7aqBDZ8x:0uPrpT/qY2Y0hU3b6XSp5MQG0d8x
TLSH
T1F8231A003BE9812BF2BE4B789DF26145467AF6633A03D6891CC411DB5713BC69A426FE
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/784-0-0x0000000000630000-0x0000000000642000-memory.dmp

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memory/784-1-0x0000000004EE0000-0x0000000004EF0000-memory.dmp

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memory/784-2-0x0000000004EF0000-0x0000000004F8C000-memory.dmp

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memory/5004-10-0x0000000002C80000-0x0000000002C90000-memory.dmp

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memory/5004-13-0x0000000002C80000-0x0000000002C90000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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