asyncrat | bcdba212508eecd7fd3128014c50bdb9466a6db4e471e7781ffe8f56b4249a76

General

Target
bcdba212508eecd7fd3128014c50bdb9466a6db4e471e7781ffe8f56b4249a76.exe
Size 45KB
Sample260804-v62dvsar4y
SHA256 bcdba212508eecd7fd3128014c50bdb9466a6db4e471e7781ffe8f56b4249a76
MD5 898cff95a0b46cc3b04afa28ba382164
SHA1 3efd0189d2fbb7617704044c78e15cded10036cc
SHA512 4647c7449c8f2bf650c3adc0c8c54cbe5ef96d9e98b434aec88db92123e8917b2f228c514071f86846d7b559d22ea43bb9379fc175097921fed3ee886006bc90
SSDEEP 768:MuLAZTnAkuSWUYzG8mo2qFo3xY6AZOOPILzjbggz3iI+zKL4z7tBDZEx:MuLAZTnbg2RulO3L3bHzSgEzndEx
TLSH
T173232A003BE8812BF2BE4F78ACF26145467AF6A77603D58A1CC451D75613FC68A426FE
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

xcavengon.click:80
xcavengon.click:22
xcavengon.click:8080
xcavengon.click:8880
xcavengon.click:2052
xcavengon.click:2082
xcavengon.click:2086
xcavengon.click:2095
xcavengon.click:443
xcavengon.click:2053
xcavengon.click:2083
xcavengon.click:2087
xcavengon.click:2096
xcavengon.click:8443
www.xcavengon.click:80
www.xcavengon.click:22
www.xcavengon.click:8080
www.xcavengon.click:8880
www.xcavengon.click:2052
www.xcavengon.click:2082
www.xcavengon.click:2086
www.xcavengon.click:2095
www.xcavengon.click:443
www.xcavengon.click:2053
www.xcavengon.click:2083
www.xcavengon.click:2087
www.xcavengon.click:2096
www.xcavengon.click:8443
mirai.xcavengon.click:80
mirai.xcavengon.click:22
mirai.xcavengon.click:8080
mirai.xcavengon.click:8880
mirai.xcavengon.click:2052
mirai.xcavengon.click:2082
mirai.xcavengon.click:2086
mirai.xcavengon.click:2095
mirai.xcavengon.click:443
mirai.xcavengon.click:2053
mirai.xcavengon.click:2083
mirai.xcavengon.click:2087
mirai.xcavengon.click:2096
mirai.xcavengon.click:8443
blacklotus.xcavengon.click:80
blacklotus.xcavengon.click:22
blacklotus.xcavengon.click:8080
blacklotus.xcavengon.click:8880
blacklotus.xcavengon.click:2052
blacklotus.xcavengon.click:2082
blacklotus.xcavengon.click:2086
blacklotus.xcavengon.click:2095
blacklotus.xcavengon.click:443
blacklotus.xcavengon.click:2053
blacklotus.xcavengon.click:2083
blacklotus.xcavengon.click:2087
blacklotus.xcavengon.click:2096
blacklotus.xcavengon.click:8443
malware.xcavengon.click:80
malware.xcavengon.click:22
malware.xcavengon.click:8080
malware.xcavengon.click:8880
malware.xcavengon.click:2052
malware.xcavengon.click:2082
malware.xcavengon.click:2086
malware.xcavengon.click:2095
malware.xcavengon.click:443
malware.xcavengon.click:2053
malware.xcavengon.click:2083
malware.xcavengon.click:2087
malware.xcavengon.click:2096
malware.xcavengon.click:8443

Mutex

17cb7XIYVDUJ

Attributes

delay
0
install
true
install_file
uug6k.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/0x0008000000024479-8.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-1-5-21-540052884-2969440504-464782435-1000\Control Panel\International\Geo\Nation	bcdba212508eecd7fd3128014c50bdb9466a6db4e471e7781ffe8f56b4249a76.exe

Executes dropped EXE 2 IoCs

pid	Process
4548	uug6k.exe
3604	uug6k.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
1504	cmd.exe
1132	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	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	uug6k.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	uug6k.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	bcdba212508eecd7fd3128014c50bdb9466a6db4e471e7781ffe8f56b4249a76.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

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
3784	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
392	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
3620	bcdba212508eecd7fd3128014c50bdb9466a6db4e471e7781ffe8f56b4249a76.exe
3620	bcdba212508eecd7fd3128014c50bdb9466a6db4e471e7781ffe8f56b4249a76.exe
3620	bcdba212508eecd7fd3128014c50bdb9466a6db4e471e7781ffe8f56b4249a76.exe
3620	bcdba212508eecd7fd3128014c50bdb9466a6db4e471e7781ffe8f56b4249a76.exe
3620	bcdba212508eecd7fd3128014c50bdb9466a6db4e471e7781ffe8f56b4249a76.exe
3620	bcdba212508eecd7fd3128014c50bdb9466a6db4e471e7781ffe8f56b4249a76.exe
3620	bcdba212508eecd7fd3128014c50bdb9466a6db4e471e7781ffe8f56b4249a76.exe
3620	bcdba212508eecd7fd3128014c50bdb9466a6db4e471e7781ffe8f56b4249a76.exe
3620	bcdba212508eecd7fd3128014c50bdb9466a6db4e471e7781ffe8f56b4249a76.exe
3620	bcdba212508eecd7fd3128014c50bdb9466a6db4e471e7781ffe8f56b4249a76.exe
3620	bcdba212508eecd7fd3128014c50bdb9466a6db4e471e7781ffe8f56b4249a76.exe
3620	bcdba212508eecd7fd3128014c50bdb9466a6db4e471e7781ffe8f56b4249a76.exe
3620	bcdba212508eecd7fd3128014c50bdb9466a6db4e471e7781ffe8f56b4249a76.exe
3620	bcdba212508eecd7fd3128014c50bdb9466a6db4e471e7781ffe8f56b4249a76.exe
3620	bcdba212508eecd7fd3128014c50bdb9466a6db4e471e7781ffe8f56b4249a76.exe
3620	bcdba212508eecd7fd3128014c50bdb9466a6db4e471e7781ffe8f56b4249a76.exe
3620	bcdba212508eecd7fd3128014c50bdb9466a6db4e471e7781ffe8f56b4249a76.exe
3620	bcdba212508eecd7fd3128014c50bdb9466a6db4e471e7781ffe8f56b4249a76.exe
3620	bcdba212508eecd7fd3128014c50bdb9466a6db4e471e7781ffe8f56b4249a76.exe
3620	bcdba212508eecd7fd3128014c50bdb9466a6db4e471e7781ffe8f56b4249a76.exe
3620	bcdba212508eecd7fd3128014c50bdb9466a6db4e471e7781ffe8f56b4249a76.exe
3620	bcdba212508eecd7fd3128014c50bdb9466a6db4e471e7781ffe8f56b4249a76.exe
3620	bcdba212508eecd7fd3128014c50bdb9466a6db4e471e7781ffe8f56b4249a76.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3620	bcdba212508eecd7fd3128014c50bdb9466a6db4e471e7781ffe8f56b4249a76.exe
Token: SeDebugPrivilege	4548	uug6k.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 3620 wrote to memory of 1132	3620	bcdba212508eecd7fd3128014c50bdb9466a6db4e471e7781ffe8f56b4249a76.exe	83
PID 3620 wrote to memory of 1504	3620	bcdba212508eecd7fd3128014c50bdb9466a6db4e471e7781ffe8f56b4249a76.exe	85
PID 1504 wrote to memory of 3784	1504	cmd.exe	87
PID 1132 wrote to memory of 392	1132	cmd.exe	88
PID 1504 wrote to memory of 3604	1504	cmd.exe	93

C:\Users\Admin\AppData\Local\Temp\bcdba212508eecd7fd3128014c50bdb9466a6db4e471e7781ffe8f56b4249a76.exe
"C:\Users\Admin\AppData\Local\Temp\bcdba212508eecd7fd3128014c50bdb9466a6db4e471e7781ffe8f56b4249a76.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3620
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "uug6k" /tr '"C:\Users\Admin\AppData\Roaming\uug6k.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1132
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "uug6k" /tr '"C:\Users\Admin\AppData\Roaming\uug6k.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:392
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp19AD.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1504
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:3784
- - C:\Users\Admin\AppData\Roaming\uug6k.exe
    "C:\Users\Admin\AppData\Roaming\uug6k.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:3604

C:\Users\Admin\AppData\Roaming\uug6k.exe
"C:\Users\Admin\AppData\Roaming\uug6k.exe"
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:4548

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

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

tmp19AD.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp19AD.tmp.bat
Size 149B
SHA256 90bdd5f872310ca972d16e49bb870e9f0c334fa0ef6b03cf1f3b1a924d6bf8fe
MD5 ae35032934caf2d8dc36c5479b34f846
SHA1 70205c3beacc0c3c82a15b5e8fc9976d78f228ea
SHA512 299a3e3dcbcaee8e6db1c0dafc371a9cdb4a952d2af9e9d6527c929e95bafbc00f181f20413e7b2f2f51d3219bf9a00accbb39d7b4f10ca96944dec2faa0cc53
TLSH
T1E2C02B4251C9EA0F280D145307FBE48C91777C193F88BB10D704401E6280849F4DD342
MD5 SHA1 SHA512 TLSH

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uug6k.exe

Path C:\Users\Admin\AppData\Roaming\uug6k.exe
Size 45KB
SHA256 bcdba212508eecd7fd3128014c50bdb9466a6db4e471e7781ffe8f56b4249a76
MD5 898cff95a0b46cc3b04afa28ba382164
SHA1 3efd0189d2fbb7617704044c78e15cded10036cc
SHA512 4647c7449c8f2bf650c3adc0c8c54cbe5ef96d9e98b434aec88db92123e8917b2f228c514071f86846d7b559d22ea43bb9379fc175097921fed3ee886006bc90
SSDEEP 768:MuLAZTnAkuSWUYzG8mo2qFo3xY6AZOOPILzjbggz3iI+zKL4z7tBDZEx:MuLAZTnbg2RulO3L3bHzSgEzndEx
TLSH
T173232A003BE8812BF2BE4F78ACF26145467AF6A77603D58A1CC451D75613FC68A426FE
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/3620-0-0x00000000003E0000-0x00000000003F2000-memory.dmp

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memory/3620-1-0x0000000004D80000-0x0000000004D90000-memory.dmp

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memory/3620-2-0x0000000004E30000-0x0000000004ECC000-memory.dmp

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memory/4548-10-0x0000000005620000-0x0000000005630000-memory.dmp

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memory/4548-13-0x0000000005620000-0x0000000005630000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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