asyncrat | 1fdf689dc739de5f0ee3bbf33c175c57970ddb1c17fb9f126a31f6ca2846e7be

General

Target
1fdf689dc739de5f0ee3bbf33c175c57970ddb1c17fb9f126a31f6ca2846e7be.exe
Size 45KB
Sample260905-psrdvavckd
SHA256 1fdf689dc739de5f0ee3bbf33c175c57970ddb1c17fb9f126a31f6ca2846e7be
MD5 0f7bac01654cf5d9be8a72d42b10d4d7
SHA1 b7632082caaf05abbf884ecd8cdf5ff0f28df092
SHA512 296ea70ee99d928de3fdbed7d3d0a8891e38a80196def287879669499b52370682724db9e99766f68aafbfd0dbad336dd69c4feb59bc22a5da2abf3a589192eb
SSDEEP 768:suJdpTP3tcsWUODmqmo2qVs+GtCVnJtHuPI+zjbYgX3i2DY/nGuVJrBDZkx:suJdpTPdI2n+TB3+3bPXS2k/Gu79dkx
TLSH
T11F232A003BD8C22BF2BE4F7898F26145867AF6637603D64D2CC452DB5613FC69A426ED
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

phimsexhaymoa.com:80
phimsexhaymoa.com:22
phimsexhaymoa.com:8080
phimsexhaymoa.com:8880
phimsexhaymoa.com:2052
phimsexhaymoa.com:2082
phimsexhaymoa.com:2086
phimsexhaymoa.com:2095
phimsexhaymoa.com:443
phimsexhaymoa.com:2053
phimsexhaymoa.com:2083
phimsexhaymoa.com:2087
phimsexhaymoa.com:2096
phimsexhaymoa.com:8443
www.phimsexhaymoa.com:80
www.phimsexhaymoa.com:22
www.phimsexhaymoa.com:8080
www.phimsexhaymoa.com:8880
www.phimsexhaymoa.com:2052
www.phimsexhaymoa.com:2082
www.phimsexhaymoa.com:2086
www.phimsexhaymoa.com:2095
www.phimsexhaymoa.com:443
www.phimsexhaymoa.com:2053
www.phimsexhaymoa.com:2083
www.phimsexhaymoa.com:2087
www.phimsexhaymoa.com:2096
www.phimsexhaymoa.com:8443
sasser.phimsexhaymoa.com:80
sasser.phimsexhaymoa.com:22
sasser.phimsexhaymoa.com:8080
sasser.phimsexhaymoa.com:8880
sasser.phimsexhaymoa.com:2052
sasser.phimsexhaymoa.com:2082
sasser.phimsexhaymoa.com:2086
sasser.phimsexhaymoa.com:2095
sasser.phimsexhaymoa.com:443
sasser.phimsexhaymoa.com:2053
sasser.phimsexhaymoa.com:2083
sasser.phimsexhaymoa.com:2087
sasser.phimsexhaymoa.com:2096
sasser.phimsexhaymoa.com:8443
cl0p.phimsexhaymoa.com:80
cl0p.phimsexhaymoa.com:22
cl0p.phimsexhaymoa.com:8080
cl0p.phimsexhaymoa.com:8880
cl0p.phimsexhaymoa.com:2052
cl0p.phimsexhaymoa.com:2082
cl0p.phimsexhaymoa.com:2086
cl0p.phimsexhaymoa.com:2095
cl0p.phimsexhaymoa.com:443
cl0p.phimsexhaymoa.com:2053
cl0p.phimsexhaymoa.com:2083
cl0p.phimsexhaymoa.com:2087
cl0p.phimsexhaymoa.com:2096
cl0p.phimsexhaymoa.com:8443

Mutex

UwUGG4vmNGjQ

Attributes

delay
0
install
true
install_file
fonrvs3g.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 2 IoCs

rat

resource	yara_rule
behavioral1/files/0x000c0000000242ac-8.dat	family_asyncrat
behavioral1/memory/2316-10-0x0000000005360000-0x0000000005370000-memory.dmp	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-1-5-21-876885714-46325919-1482798410-1000\Control Panel\International\Geo\Nation	1fdf689dc739de5f0ee3bbf33c175c57970ddb1c17fb9f126a31f6ca2846e7be.exe

Executes dropped EXE 2 IoCs

pid	Process
2316	fonrvs3g.exe
408	fonrvs3g.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	18	172.67.200.200:22	2316	fonrvs3g.exe
SSH destination	33	104.21.44.146:22	2316	fonrvs3g.exe
SSH destination	52	172.67.200.200:22	2316	fonrvs3g.exe
SSH destination	63	104.21.44.146:22	2316	fonrvs3g.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
3968	cmd.exe
3536	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	1fdf689dc739de5f0ee3bbf33c175c57970ddb1c17fb9f126a31f6ca2846e7be.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	fonrvs3g.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	fonrvs3g.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
2132	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
3796	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
2284	1fdf689dc739de5f0ee3bbf33c175c57970ddb1c17fb9f126a31f6ca2846e7be.exe
2284	1fdf689dc739de5f0ee3bbf33c175c57970ddb1c17fb9f126a31f6ca2846e7be.exe
2284	1fdf689dc739de5f0ee3bbf33c175c57970ddb1c17fb9f126a31f6ca2846e7be.exe
2284	1fdf689dc739de5f0ee3bbf33c175c57970ddb1c17fb9f126a31f6ca2846e7be.exe
2284	1fdf689dc739de5f0ee3bbf33c175c57970ddb1c17fb9f126a31f6ca2846e7be.exe
2284	1fdf689dc739de5f0ee3bbf33c175c57970ddb1c17fb9f126a31f6ca2846e7be.exe
2284	1fdf689dc739de5f0ee3bbf33c175c57970ddb1c17fb9f126a31f6ca2846e7be.exe
2284	1fdf689dc739de5f0ee3bbf33c175c57970ddb1c17fb9f126a31f6ca2846e7be.exe
2284	1fdf689dc739de5f0ee3bbf33c175c57970ddb1c17fb9f126a31f6ca2846e7be.exe
2284	1fdf689dc739de5f0ee3bbf33c175c57970ddb1c17fb9f126a31f6ca2846e7be.exe
2284	1fdf689dc739de5f0ee3bbf33c175c57970ddb1c17fb9f126a31f6ca2846e7be.exe
2284	1fdf689dc739de5f0ee3bbf33c175c57970ddb1c17fb9f126a31f6ca2846e7be.exe
2284	1fdf689dc739de5f0ee3bbf33c175c57970ddb1c17fb9f126a31f6ca2846e7be.exe
2284	1fdf689dc739de5f0ee3bbf33c175c57970ddb1c17fb9f126a31f6ca2846e7be.exe
2284	1fdf689dc739de5f0ee3bbf33c175c57970ddb1c17fb9f126a31f6ca2846e7be.exe
2284	1fdf689dc739de5f0ee3bbf33c175c57970ddb1c17fb9f126a31f6ca2846e7be.exe
2284	1fdf689dc739de5f0ee3bbf33c175c57970ddb1c17fb9f126a31f6ca2846e7be.exe
2284	1fdf689dc739de5f0ee3bbf33c175c57970ddb1c17fb9f126a31f6ca2846e7be.exe
2284	1fdf689dc739de5f0ee3bbf33c175c57970ddb1c17fb9f126a31f6ca2846e7be.exe
2284	1fdf689dc739de5f0ee3bbf33c175c57970ddb1c17fb9f126a31f6ca2846e7be.exe
2284	1fdf689dc739de5f0ee3bbf33c175c57970ddb1c17fb9f126a31f6ca2846e7be.exe
2284	1fdf689dc739de5f0ee3bbf33c175c57970ddb1c17fb9f126a31f6ca2846e7be.exe
2284	1fdf689dc739de5f0ee3bbf33c175c57970ddb1c17fb9f126a31f6ca2846e7be.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2284	1fdf689dc739de5f0ee3bbf33c175c57970ddb1c17fb9f126a31f6ca2846e7be.exe
Token: SeDebugPrivilege	2316	fonrvs3g.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 2284 wrote to memory of 3968	2284	1fdf689dc739de5f0ee3bbf33c175c57970ddb1c17fb9f126a31f6ca2846e7be.exe	88
PID 2284 wrote to memory of 3536	2284	1fdf689dc739de5f0ee3bbf33c175c57970ddb1c17fb9f126a31f6ca2846e7be.exe	90
PID 3536 wrote to memory of 2132	3536	cmd.exe	92
PID 3968 wrote to memory of 3796	3968	cmd.exe	93
PID 3536 wrote to memory of 408	3536	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\1fdf689dc739de5f0ee3bbf33c175c57970ddb1c17fb9f126a31f6ca2846e7be.exe
"C:\Users\Admin\AppData\Local\Temp\1fdf689dc739de5f0ee3bbf33c175c57970ddb1c17fb9f126a31f6ca2846e7be.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2284
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "fonrvs3g" /tr '"C:\Users\Admin\AppData\Roaming\fonrvs3g.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3968
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "fonrvs3g" /tr '"C:\Users\Admin\AppData\Roaming\fonrvs3g.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:3796
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp7114.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3536
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:2132
- - C:\Users\Admin\AppData\Roaming\fonrvs3g.exe
    "C:\Users\Admin\AppData\Roaming\fonrvs3g.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:408

C:\Users\Admin\AppData\Roaming\fonrvs3g.exe
"C:\Users\Admin\AppData\Roaming\fonrvs3g.exe"
1⤵
- Executes dropped EXE
- Outbound SSH connection to public host
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:2316

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

Replay Monitor

Loading Replay Monitor...

Downloads

tmp7114.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp7114.tmp.bat
Size 152B
SHA256 d62047d6d2c2300863304855f86ac3b66b66457963ae31b026f3dd8c93326c06
MD5 2f099cd8d92b8a887f32433a48ef43d4
SHA1 ee8ee08562d6ede14589065894d8ea8d18bac951
SHA512 81e131edc1785387741f0892dfc62bc9292bac1bf964575d0728a403b75d20f8a57cbcbcbac811042fcf197de276cde7c9ff01eaf293eea5be5c475d7cb9e110
TLSH
T1FBC02B5756CAEB5E2805E81302FED99CA172BD5E3F44FB00C748404E6380448F4DD741
MD5 SHA1 SHA512 TLSH

Submit Download

fonrvs3g.exe

Path C:\Users\Admin\AppData\Roaming\fonrvs3g.exe
Size 45KB
SHA256 1fdf689dc739de5f0ee3bbf33c175c57970ddb1c17fb9f126a31f6ca2846e7be
MD5 0f7bac01654cf5d9be8a72d42b10d4d7
SHA1 b7632082caaf05abbf884ecd8cdf5ff0f28df092
SHA512 296ea70ee99d928de3fdbed7d3d0a8891e38a80196def287879669499b52370682724db9e99766f68aafbfd0dbad336dd69c4feb59bc22a5da2abf3a589192eb
SSDEEP 768:suJdpTP3tcsWUODmqmo2qVs+GtCVnJtHuPI+zjbYgX3i2DY/nGuVJrBDZkx:suJdpTPdI2n+TB3+3bPXS2k/Gu79dkx
TLSH
T11F232A003BD8C22BF2BE4F7898F26145867AF6637603D64D2CC452DB5613FC69A426ED
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2284-0-0x0000000000950000-0x0000000000962000-memory.dmp

Download

memory/2284-1-0x00000000052D0000-0x00000000052E0000-memory.dmp

Download

memory/2284-2-0x0000000005380000-0x000000000541C000-memory.dmp

Download

memory/2316-10-0x0000000005360000-0x0000000005370000-memory.dmp

Download

memory/2316-13-0x0000000005360000-0x0000000005370000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads