asyncrat | 71b0da5755ef725aba207067df74b1404486af7e3d54f2d8ceb0847dd00058ee

General

Target
71b0da5755ef725aba207067df74b1404486af7e3d54f2d8ceb0847dd00058ee.exe
Size 45KB
Sample260804-1bs2ws1bnd
SHA256 71b0da5755ef725aba207067df74b1404486af7e3d54f2d8ceb0847dd00058ee
MD5 f3a8ac005bda3e5acb022e5867542d10
SHA1 d53ca23ebcc00d83b9f8cadde8c5fca5ea696014
SHA512 4486db4c21e86445ffc7faf872c987fdc4c0b2b06a0a7dabb2aef8f237aac78cb71d2d3c11a637842e98961953c8032f0a82dbd46bdc4fd2497fb646b17917b6
SSDEEP 768:5uSy6pTpwrSWWUE3/WImo2qNC9YikqHztOPIUzjbEgn3i+21ZA/t1EWBDZ0x:5uSy6pTpoo2valK3U3bLnS5E1E4d0x
TLSH
T147232A003BE9C12BF2BE5F789DF26105867AB2633603D54A1CC4529B5713FC29A526FE
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

xemsexmy.org:80
xemsexmy.org:22
xemsexmy.org:8080
xemsexmy.org:8880
xemsexmy.org:2052
xemsexmy.org:2082
xemsexmy.org:2086
xemsexmy.org:2095
xemsexmy.org:443
xemsexmy.org:2053
xemsexmy.org:2083
xemsexmy.org:2087
xemsexmy.org:2096
xemsexmy.org:8443
www.xemsexmy.org:80
www.xemsexmy.org:22
www.xemsexmy.org:8080
www.xemsexmy.org:8880
www.xemsexmy.org:2052
www.xemsexmy.org:2082
www.xemsexmy.org:2086
www.xemsexmy.org:2095
www.xemsexmy.org:443
www.xemsexmy.org:2053
www.xemsexmy.org:2083
www.xemsexmy.org:2087
www.xemsexmy.org:2096
www.xemsexmy.org:8443
dridex.xemsexmy.org:80
dridex.xemsexmy.org:22
dridex.xemsexmy.org:8080
dridex.xemsexmy.org:8880
dridex.xemsexmy.org:2052
dridex.xemsexmy.org:2082
dridex.xemsexmy.org:2086
dridex.xemsexmy.org:2095
dridex.xemsexmy.org:443
dridex.xemsexmy.org:2053
dridex.xemsexmy.org:2083
dridex.xemsexmy.org:2087
dridex.xemsexmy.org:2096
dridex.xemsexmy.org:8443
mydoom.xemsexmy.org:80
mydoom.xemsexmy.org:22
mydoom.xemsexmy.org:8080
mydoom.xemsexmy.org:8880
mydoom.xemsexmy.org:2052
mydoom.xemsexmy.org:2082
mydoom.xemsexmy.org:2086
mydoom.xemsexmy.org:2095
mydoom.xemsexmy.org:443
mydoom.xemsexmy.org:2053
mydoom.xemsexmy.org:2083
mydoom.xemsexmy.org:2087
mydoom.xemsexmy.org:2096
mydoom.xemsexmy.org:8443

Mutex

b4gAwLFxeNMc

Attributes

delay
0
install
true
install_file
rlke77h.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/0x000e0000000231e4-8.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-1-5-21-3053180483-1881419501-3594244048-1000\Control Panel\International\Geo\Nation	71b0da5755ef725aba207067df74b1404486af7e3d54f2d8ceb0847dd00058ee.exe

Executes dropped EXE 2 IoCs

pid	Process
1268	rlke77h.exe
6052	rlke77h.exe

Outbound SSH connection to public host 2 TTPs 2 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	100	104.21.32.163:22	1268	rlke77h.exe
SSH destination	103	172.67.152.224:22	1268	rlke77h.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
5792	cmd.exe
2032	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	71b0da5755ef725aba207067df74b1404486af7e3d54f2d8ceb0847dd00058ee.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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rlke77h.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rlke77h.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
4500	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
4160	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
2700	71b0da5755ef725aba207067df74b1404486af7e3d54f2d8ceb0847dd00058ee.exe
2700	71b0da5755ef725aba207067df74b1404486af7e3d54f2d8ceb0847dd00058ee.exe
2700	71b0da5755ef725aba207067df74b1404486af7e3d54f2d8ceb0847dd00058ee.exe
2700	71b0da5755ef725aba207067df74b1404486af7e3d54f2d8ceb0847dd00058ee.exe
2700	71b0da5755ef725aba207067df74b1404486af7e3d54f2d8ceb0847dd00058ee.exe
2700	71b0da5755ef725aba207067df74b1404486af7e3d54f2d8ceb0847dd00058ee.exe
2700	71b0da5755ef725aba207067df74b1404486af7e3d54f2d8ceb0847dd00058ee.exe
2700	71b0da5755ef725aba207067df74b1404486af7e3d54f2d8ceb0847dd00058ee.exe
2700	71b0da5755ef725aba207067df74b1404486af7e3d54f2d8ceb0847dd00058ee.exe
2700	71b0da5755ef725aba207067df74b1404486af7e3d54f2d8ceb0847dd00058ee.exe
2700	71b0da5755ef725aba207067df74b1404486af7e3d54f2d8ceb0847dd00058ee.exe
2700	71b0da5755ef725aba207067df74b1404486af7e3d54f2d8ceb0847dd00058ee.exe
2700	71b0da5755ef725aba207067df74b1404486af7e3d54f2d8ceb0847dd00058ee.exe
2700	71b0da5755ef725aba207067df74b1404486af7e3d54f2d8ceb0847dd00058ee.exe
2700	71b0da5755ef725aba207067df74b1404486af7e3d54f2d8ceb0847dd00058ee.exe
2700	71b0da5755ef725aba207067df74b1404486af7e3d54f2d8ceb0847dd00058ee.exe
2700	71b0da5755ef725aba207067df74b1404486af7e3d54f2d8ceb0847dd00058ee.exe
2700	71b0da5755ef725aba207067df74b1404486af7e3d54f2d8ceb0847dd00058ee.exe
2700	71b0da5755ef725aba207067df74b1404486af7e3d54f2d8ceb0847dd00058ee.exe
2700	71b0da5755ef725aba207067df74b1404486af7e3d54f2d8ceb0847dd00058ee.exe
2700	71b0da5755ef725aba207067df74b1404486af7e3d54f2d8ceb0847dd00058ee.exe
2700	71b0da5755ef725aba207067df74b1404486af7e3d54f2d8ceb0847dd00058ee.exe
2700	71b0da5755ef725aba207067df74b1404486af7e3d54f2d8ceb0847dd00058ee.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2700	71b0da5755ef725aba207067df74b1404486af7e3d54f2d8ceb0847dd00058ee.exe
Token: SeDebugPrivilege	1268	rlke77h.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 2700 wrote to memory of 5792	2700	71b0da5755ef725aba207067df74b1404486af7e3d54f2d8ceb0847dd00058ee.exe	86
PID 2700 wrote to memory of 2032	2700	71b0da5755ef725aba207067df74b1404486af7e3d54f2d8ceb0847dd00058ee.exe	88
PID 2032 wrote to memory of 4500	2032	cmd.exe	90
PID 5792 wrote to memory of 4160	5792	cmd.exe	91
PID 2032 wrote to memory of 6052	2032	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\71b0da5755ef725aba207067df74b1404486af7e3d54f2d8ceb0847dd00058ee.exe
"C:\Users\Admin\AppData\Local\Temp\71b0da5755ef725aba207067df74b1404486af7e3d54f2d8ceb0847dd00058ee.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2700
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "rlke77h" /tr '"C:\Users\Admin\AppData\Roaming\rlke77h.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:5792
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "rlke77h" /tr '"C:\Users\Admin\AppData\Roaming\rlke77h.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:4160
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp3EBA.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2032
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:4500
- - C:\Users\Admin\AppData\Roaming\rlke77h.exe
    "C:\Users\Admin\AppData\Roaming\rlke77h.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:6052

C:\Users\Admin\AppData\Roaming\rlke77h.exe
"C:\Users\Admin\AppData\Roaming\rlke77h.exe"
1⤵
- Executes dropped EXE
- Outbound SSH connection to public host
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:1268

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

tmp3EBA.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp3EBA.tmp.bat
Size 151B
SHA256 1b8b7a596edeaa84063ca7572e6636ea4ff03930bb0c4c728c341c82a6268f6e
MD5 2ad4f700bd1e85fd3a8183e77c2788c9
SHA1 594f76ba165403265279480fb605fb4695bcb676
SHA512 3b032550deeaffd91539ece647e254897c5aed80d28abf84fe575cb4502a8b3c8c0c33e0a9dc533a878b9fe28efe65ea1f1c9d813254598c5b88ad0807080d6b
TLSH
T1F0C08C8655C5AA6E2C0A141302BA968D91766D193E84BB00970440893281848E0A9289
MD5 SHA1 SHA512 TLSH

Submit Download

rlke77h.exe

Path C:\Users\Admin\AppData\Roaming\rlke77h.exe
Size 45KB
SHA256 71b0da5755ef725aba207067df74b1404486af7e3d54f2d8ceb0847dd00058ee
MD5 f3a8ac005bda3e5acb022e5867542d10
SHA1 d53ca23ebcc00d83b9f8cadde8c5fca5ea696014
SHA512 4486db4c21e86445ffc7faf872c987fdc4c0b2b06a0a7dabb2aef8f237aac78cb71d2d3c11a637842e98961953c8032f0a82dbd46bdc4fd2497fb646b17917b6
SSDEEP 768:5uSy6pTpwrSWWUE3/WImo2qNC9YikqHztOPIUzjbEgn3i+21ZA/t1EWBDZ0x:5uSy6pTpoo2valK3U3bLnS5E1E4d0x
TLSH
T147232A003BE9C12BF2BE5F789DF26105867AB2633603D54A1CC4529B5713FC29A526FE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1268-10-0x0000000004B50000-0x0000000004B60000-memory.dmp

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memory/1268-13-0x0000000004B50000-0x0000000004B60000-memory.dmp

Download

memory/2700-0-0x0000000000940000-0x0000000000952000-memory.dmp

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memory/2700-1-0x00000000052D0000-0x00000000052E0000-memory.dmp

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memory/2700-2-0x0000000005380000-0x000000000541C000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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