asyncrat | bfab782f9e1244583b3496c6993c47d25ec07f5f024f000d471650ebcac7d9cf

General

Target
bfab782f9e1244583b3496c6993c47d25ec07f5f024f000d471650ebcac7d9cf.exe
Size 45KB
Sample260804-gftdnssbrh
SHA256 bfab782f9e1244583b3496c6993c47d25ec07f5f024f000d471650ebcac7d9cf
MD5 ab7068458c15a8f2edbfae725979d8c1
SHA1 55b2984b99d23e039174da055c4a4dfc27cb1311
SHA512 41bc79ad4cf1e3e917d97d64d7f8718b5a20e20675c03dd9a4d9978bf49cb14314c50ecec66904b5ca4dc5bcff20a824f61449a263e9d5caee926b5625795c0c
SSDEEP 768:cuR0JTPUYkEWUmjWymo2q1fLiE02FjMdjYkkmPIOzjbogX3i6lWbN7vbQCQ5CMEL:cuR0JTPjY2SL9wQPO3b/XSGYrm4GFdUx
TLSH
T15B232A0037E9812BF2BE4F7869F26245867AF6732603D54D1CC451DB5723BC68A43AFA
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

twosisterstubes.com:80
twosisterstubes.com:22
twosisterstubes.com:8080
twosisterstubes.com:8880
twosisterstubes.com:2052
twosisterstubes.com:2082
twosisterstubes.com:2086
twosisterstubes.com:2095
twosisterstubes.com:443
twosisterstubes.com:2053
twosisterstubes.com:2083
twosisterstubes.com:2087
twosisterstubes.com:2096
twosisterstubes.com:8443
www.twosisterstubes.com:80
www.twosisterstubes.com:22
www.twosisterstubes.com:8080
www.twosisterstubes.com:8880
www.twosisterstubes.com:2052
www.twosisterstubes.com:2082
www.twosisterstubes.com:2086
www.twosisterstubes.com:2095
www.twosisterstubes.com:443
www.twosisterstubes.com:2053
www.twosisterstubes.com:2083
www.twosisterstubes.com:2087
www.twosisterstubes.com:2096
www.twosisterstubes.com:8443
klez.twosisterstubes.com:80
klez.twosisterstubes.com:22
klez.twosisterstubes.com:8080
klez.twosisterstubes.com:8880
klez.twosisterstubes.com:2052
klez.twosisterstubes.com:2082
klez.twosisterstubes.com:2086
klez.twosisterstubes.com:2095
klez.twosisterstubes.com:443
klez.twosisterstubes.com:2053
klez.twosisterstubes.com:2083
klez.twosisterstubes.com:2087
klez.twosisterstubes.com:2096
klez.twosisterstubes.com:8443
hack.twosisterstubes.com:80
hack.twosisterstubes.com:22
hack.twosisterstubes.com:8080
hack.twosisterstubes.com:8880
hack.twosisterstubes.com:2052
hack.twosisterstubes.com:2082
hack.twosisterstubes.com:2086
hack.twosisterstubes.com:2095
hack.twosisterstubes.com:443
hack.twosisterstubes.com:2053
hack.twosisterstubes.com:2083
hack.twosisterstubes.com:2087
hack.twosisterstubes.com:2096
hack.twosisterstubes.com:8443

Mutex

JhfhL9PJRYVl

Attributes

delay
0
install
true
install_file
fqb5.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/0x001100000001e410-8.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-1-5-21-204488895-2999877624-296153668-1000\Control Panel\International\Geo\Nation	bfab782f9e1244583b3496c6993c47d25ec07f5f024f000d471650ebcac7d9cf.exe

Executes dropped EXE 2 IoCs

pid	Process
408	fqb5.exe
3208	fqb5.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	30	172.67.175.110:22	408	fqb5.exe
SSH destination	35	104.21.17.96:22	408	fqb5.exe
SSH destination	7	172.67.175.110:22	408	fqb5.exe
SSH destination	16	104.21.17.96:22	408	fqb5.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
1416	cmd.exe
584	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	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	fqb5.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	fqb5.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	bfab782f9e1244583b3496c6993c47d25ec07f5f024f000d471650ebcac7d9cf.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
4628	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
3844	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
5000	bfab782f9e1244583b3496c6993c47d25ec07f5f024f000d471650ebcac7d9cf.exe
5000	bfab782f9e1244583b3496c6993c47d25ec07f5f024f000d471650ebcac7d9cf.exe
5000	bfab782f9e1244583b3496c6993c47d25ec07f5f024f000d471650ebcac7d9cf.exe
5000	bfab782f9e1244583b3496c6993c47d25ec07f5f024f000d471650ebcac7d9cf.exe
5000	bfab782f9e1244583b3496c6993c47d25ec07f5f024f000d471650ebcac7d9cf.exe
5000	bfab782f9e1244583b3496c6993c47d25ec07f5f024f000d471650ebcac7d9cf.exe
5000	bfab782f9e1244583b3496c6993c47d25ec07f5f024f000d471650ebcac7d9cf.exe
5000	bfab782f9e1244583b3496c6993c47d25ec07f5f024f000d471650ebcac7d9cf.exe
5000	bfab782f9e1244583b3496c6993c47d25ec07f5f024f000d471650ebcac7d9cf.exe
5000	bfab782f9e1244583b3496c6993c47d25ec07f5f024f000d471650ebcac7d9cf.exe
5000	bfab782f9e1244583b3496c6993c47d25ec07f5f024f000d471650ebcac7d9cf.exe
5000	bfab782f9e1244583b3496c6993c47d25ec07f5f024f000d471650ebcac7d9cf.exe
5000	bfab782f9e1244583b3496c6993c47d25ec07f5f024f000d471650ebcac7d9cf.exe
5000	bfab782f9e1244583b3496c6993c47d25ec07f5f024f000d471650ebcac7d9cf.exe
5000	bfab782f9e1244583b3496c6993c47d25ec07f5f024f000d471650ebcac7d9cf.exe
5000	bfab782f9e1244583b3496c6993c47d25ec07f5f024f000d471650ebcac7d9cf.exe
5000	bfab782f9e1244583b3496c6993c47d25ec07f5f024f000d471650ebcac7d9cf.exe
5000	bfab782f9e1244583b3496c6993c47d25ec07f5f024f000d471650ebcac7d9cf.exe
5000	bfab782f9e1244583b3496c6993c47d25ec07f5f024f000d471650ebcac7d9cf.exe
5000	bfab782f9e1244583b3496c6993c47d25ec07f5f024f000d471650ebcac7d9cf.exe
5000	bfab782f9e1244583b3496c6993c47d25ec07f5f024f000d471650ebcac7d9cf.exe
5000	bfab782f9e1244583b3496c6993c47d25ec07f5f024f000d471650ebcac7d9cf.exe
5000	bfab782f9e1244583b3496c6993c47d25ec07f5f024f000d471650ebcac7d9cf.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	5000	bfab782f9e1244583b3496c6993c47d25ec07f5f024f000d471650ebcac7d9cf.exe
Token: SeDebugPrivilege	408	fqb5.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 5000 wrote to memory of 1416	5000	bfab782f9e1244583b3496c6993c47d25ec07f5f024f000d471650ebcac7d9cf.exe	86
PID 5000 wrote to memory of 584	5000	bfab782f9e1244583b3496c6993c47d25ec07f5f024f000d471650ebcac7d9cf.exe	88
PID 584 wrote to memory of 4628	584	cmd.exe	90
PID 1416 wrote to memory of 3844	1416	cmd.exe	91
PID 584 wrote to memory of 3208	584	cmd.exe	98

C:\Users\Admin\AppData\Local\Temp\bfab782f9e1244583b3496c6993c47d25ec07f5f024f000d471650ebcac7d9cf.exe
"C:\Users\Admin\AppData\Local\Temp\bfab782f9e1244583b3496c6993c47d25ec07f5f024f000d471650ebcac7d9cf.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5000
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "fqb5" /tr '"C:\Users\Admin\AppData\Roaming\fqb5.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1416
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "fqb5" /tr '"C:\Users\Admin\AppData\Roaming\fqb5.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:3844
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpC762.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:584
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:4628
- - C:\Users\Admin\AppData\Roaming\fqb5.exe
    "C:\Users\Admin\AppData\Roaming\fqb5.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:3208

C:\Users\Admin\AppData\Roaming\fqb5.exe
"C:\Users\Admin\AppData\Roaming\fqb5.exe"
1⤵
- Executes dropped EXE
- Outbound SSH connection to public host
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:408

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

tmpC762.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmpC762.tmp.bat
Size 148B
SHA256 3641a89a45a4b6b1db2623ad49eeafd54e0350e525176ae6adc5a0c8d0b254de
MD5 b9660bc7d15ac2de05a1acebec7b28e8
SHA1 28b0615f4f6327c70480ed6e280322a325e6e527
SHA512 961c89b5ac931628e2b6c55071e087fe43967512b970cc3ec06374d3ffe98d1ffb91dff2f2439832c445cdafa195de0c018f560461f42b399e0c10f6bda339eb
TLSH
T1ECC02B8391C5EB4E38052C2306FBE68CA176AD6A3F40BB00D708801D1680C98F4DA341
MD5 SHA1 SHA512 TLSH

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fqb5.exe

Path C:\Users\Admin\AppData\Roaming\fqb5.exe
Size 45KB
SHA256 bfab782f9e1244583b3496c6993c47d25ec07f5f024f000d471650ebcac7d9cf
MD5 ab7068458c15a8f2edbfae725979d8c1
SHA1 55b2984b99d23e039174da055c4a4dfc27cb1311
SHA512 41bc79ad4cf1e3e917d97d64d7f8718b5a20e20675c03dd9a4d9978bf49cb14314c50ecec66904b5ca4dc5bcff20a824f61449a263e9d5caee926b5625795c0c
SSDEEP 768:cuR0JTPUYkEWUmjWymo2q1fLiE02FjMdjYkkmPIOzjbogX3i6lWbN7vbQCQ5CMEL:cuR0JTPjY2SL9wQPO3b/XSGYrm4GFdUx
TLSH
T15B232A0037E9812BF2BE4F7869F26245867AF6732603D54D1CC451DB5723BC68A43AFA
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/408-10-0x0000000004E80000-0x0000000004E90000-memory.dmp

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memory/408-13-0x0000000004E80000-0x0000000004E90000-memory.dmp

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memory/5000-0-0x0000000000A30000-0x0000000000A42000-memory.dmp

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memory/5000-1-0x0000000005450000-0x0000000005460000-memory.dmp

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memory/5000-2-0x0000000005310000-0x00000000053AC000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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