asyncrat | cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84

Analysis

max time kernel
148s
max time network
150s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260709-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260709-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
12/07/2026, 16:39

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General

Target
cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
Size 45KB
Sample260712-t563aaft7w
SHA256 cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84
MD5 070189524bbf188e64192a5e9f938d2a
SHA1 67cd4e4b92ba58117866d96f037078bd664bacc5
SHA512 8fcd04cb2a6c08e41f45098a63f0286bd552c44ecfb755e729a84709d84b7de42b121b5462a984003b9abb3b93ea8d9267abe0d7e78d623922d3d318f0553776
SSDEEP 768:MuLAZTnAkuSWUYzG8mo2qFHBlte40WMOPI0IzjbKgX1ihezQiTjUM+BDZEx:MuLAZTnbg202UM30I3bdXkhaQiTjQdEx
TLSH
T151232B0037E8812BF2BE5FB8A9F26145467AF6737503D58E1CC4429B4623FC696426FD
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

phimsexvn.work:80
phimsexvn.work:22
phimsexvn.work:8080
phimsexvn.work:8880
phimsexvn.work:2052
phimsexvn.work:2082
phimsexvn.work:2086
phimsexvn.work:2095
phimsexvn.work:443
phimsexvn.work:2053
phimsexvn.work:2083
phimsexvn.work:2087
phimsexvn.work:2096
phimsexvn.work:8443
www.phimsexvn.work:80
www.phimsexvn.work:22
www.phimsexvn.work:8080
www.phimsexvn.work:8880
www.phimsexvn.work:2052
www.phimsexvn.work:2082
www.phimsexvn.work:2086
www.phimsexvn.work:2095
www.phimsexvn.work:443
www.phimsexvn.work:2053
www.phimsexvn.work:2083
www.phimsexvn.work:2087
www.phimsexvn.work:2096
www.phimsexvn.work:8443
emotet.phimsexvn.work:80
emotet.phimsexvn.work:22
emotet.phimsexvn.work:8080
emotet.phimsexvn.work:8880
emotet.phimsexvn.work:2052
emotet.phimsexvn.work:2082
emotet.phimsexvn.work:2086
emotet.phimsexvn.work:2095
emotet.phimsexvn.work:443
emotet.phimsexvn.work:2053
emotet.phimsexvn.work:2083
emotet.phimsexvn.work:2087
emotet.phimsexvn.work:2096
emotet.phimsexvn.work:8443
malware.phimsexvn.work:80
malware.phimsexvn.work:22
malware.phimsexvn.work:8080
malware.phimsexvn.work:8880
malware.phimsexvn.work:2052
malware.phimsexvn.work:2082
malware.phimsexvn.work:2086
malware.phimsexvn.work:2095
malware.phimsexvn.work:443
malware.phimsexvn.work:2053
malware.phimsexvn.work:2083
malware.phimsexvn.work:2087
malware.phimsexvn.work:2096
malware.phimsexvn.work:8443
gozi.phimsexvn.work:80
gozi.phimsexvn.work:22
gozi.phimsexvn.work:8080
gozi.phimsexvn.work:8880
gozi.phimsexvn.work:2052
gozi.phimsexvn.work:2082
gozi.phimsexvn.work:2086
gozi.phimsexvn.work:2095
gozi.phimsexvn.work:443
gozi.phimsexvn.work:2053
gozi.phimsexvn.work:2083
gozi.phimsexvn.work:2087
gozi.phimsexvn.work:2096
gozi.phimsexvn.work:8443

Mutex

PzJ2fA7j2P08

Attributes

delay
0
install
true
install_file
fsmyo.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
behavioral2/files/0x000e00000001c532-10.dat	family_asyncrat

Executes dropped EXE 2 IoCs

pid	Process
3856	fsmyo.exe
4116	fsmyo.exe

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

System Information Discovery
T1082

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	fsmyo.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.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	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	fsmyo.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
3988	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
4228	schtasks.exe

Suspicious behavior: EnumeratesProcesses 29 IoCs

pid	Process
5676	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
5676	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
5676	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
5676	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
5676	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
5676	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
5676	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
5676	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
5676	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
5676	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
5676	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
5676	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
5676	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
5676	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
5676	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
5676	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
5676	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
5676	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
5676	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
5676	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
5676	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
5676	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
5676	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
5676	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
5676	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
5676	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
5676	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
5676	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
5676	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	5676	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 5676 wrote to memory of 3272	5676	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe	86
PID 5676 wrote to memory of 6136	5676	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe	88
PID 3272 wrote to memory of 4228	3272	cmd.exe	90
PID 6136 wrote to memory of 3988	6136	cmd.exe	91
PID 6136 wrote to memory of 4116	6136	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
"C:\Users\Admin\AppData\Local\Temp\cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5676
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "fsmyo" /tr '"C:\Users\Admin\AppData\Roaming\fsmyo.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3272
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "fsmyo" /tr '"C:\Users\Admin\AppData\Roaming\fsmyo.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:4228
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpBF4F.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:6136
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:3988
- - C:\Users\Admin\AppData\Roaming\fsmyo.exe
    "C:\Users\Admin\AppData\Roaming\fsmyo.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:4116

C:\Users\Admin\AppData\Roaming\fsmyo.exe
"C:\Users\Admin\AppData\Roaming\fsmyo.exe"
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
PID:3856

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

tmpBF4F.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmpBF4F.tmp.bat
Size 149B
SHA256 d278f21454f57d8ac22f2eb013a1cda1f96902f38fdb0d677c052b208e1ebde8
MD5 30a971eaab95a64cb38ef3fac0256b6d
SHA1 537a5a4e5a48961034acfdc0622b6c934c1836b9
SHA512 3ee00ca61a5d3970084db4efcff698682db8c8c9c2fe6b3372bfa3085ca8c8f763072234ed05dc012767303959057233f6f06b8fc9672550a625fa4a5156123e
TLSH
T168C02B93A1C5EB0F7809283302FBD4CC9172BC593F40BB00C704C48D12C0888F4EA381
MD5 SHA1 SHA512 TLSH

Submit Download

fsmyo.exe

Path C:\Users\Admin\AppData\Roaming\fsmyo.exe
Size 45KB
SHA256 cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84
MD5 070189524bbf188e64192a5e9f938d2a
SHA1 67cd4e4b92ba58117866d96f037078bd664bacc5
SHA512 8fcd04cb2a6c08e41f45098a63f0286bd552c44ecfb755e729a84709d84b7de42b121b5462a984003b9abb3b93ea8d9267abe0d7e78d623922d3d318f0553776
SSDEEP 768:MuLAZTnAkuSWUYzG8mo2qFHBlte40WMOPI0IzjbKgX1ihezQiTjUM+BDZEx:MuLAZTnbg202UM30I3bdXkhaQiTjQdEx
TLSH
T151232B0037E8812BF2BE5FB8A9F26145467AF6737503D58E1CC4429B4623FC696426FD
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3856-12-0x0000000074510000-0x0000000074CCC000-memory.dmp

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memory/3856-14-0x0000000074510000-0x0000000074CCC000-memory.dmp

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memory/5676-0-0x0000000074522000-0x0000000074523000-memory.dmp

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memory/5676-1-0x0000000000270000-0x0000000000282000-memory.dmp

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memory/5676-2-0x0000000074510000-0x0000000074CCC000-memory.dmp

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memory/5676-3-0x0000000004E40000-0x0000000004EDC000-memory.dmp

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memory/5676-8-0x0000000074510000-0x0000000074CCC000-memory.dmp

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