asyncrat | cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84

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

C2

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
behavioral1/files/0x0008000000024554-8.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-1-5-21-1074038928-2032447174-945360078-1000\Control Panel\International\Geo\Nation	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe

Executes dropped EXE 2 IoCs

pid	Process
3440	fsmyo.exe
624	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	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	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	fsmyo.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	fsmyo.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
4028	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
4744	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
772	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
772	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
772	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
772	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
772	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
772	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
772	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
772	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
772	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
772	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
772	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
772	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
772	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
772	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
772	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
772	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
772	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
772	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
772	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
772	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
772	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
772	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
772	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	772	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
Token: SeDebugPrivilege	3440	fsmyo.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 772 wrote to memory of 3884	772	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe	87
PID 772 wrote to memory of 4944	772	cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe	89
PID 4944 wrote to memory of 4028	4944	cmd.exe	91
PID 3884 wrote to memory of 4744	3884	cmd.exe	92
PID 4944 wrote to memory of 624	4944	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe
"C:\Users\Admin\AppData\Local\Temp\cf2b2ac8f6513ee9ae8857a9617460ec6285297cb442fff993f4ae58eeb62a84.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:772
- 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:3884
- - 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:4744
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp4ADF.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4944
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:4028
- - 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:624

C:\Users\Admin\AppData\Roaming\fsmyo.exe
"C:\Users\Admin\AppData\Roaming\fsmyo.exe"
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:3440

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

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

tmp4ADF.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp4ADF.tmp.bat
Size 149B
SHA256 4291461e9e0cef7a14c5c3ac10cdf95dcc04bee682ff7673d8d5e747a3009676
MD5 1de6a9d9e3eff1f170e634309f812c8d
SHA1 205dbcfdbff908eff748136ce64f337bf46946d1
SHA512 3bc230471f3c120f956be75b095082b9a0d4505449c7f9cf13aba20e6e96b88c65866ddd0a63a40ed16eeead3b8006d8baf12af324fb7b7fea04daee779200b0
TLSH
T16EC02B9391C5EB5E781BB82303FAD4DCD172BC193F40BB04C705448E1280848F8EA342
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/772-0-0x00000000000B0000-0x00000000000C2000-memory.dmp

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memory/772-1-0x0000000004B50000-0x0000000004B60000-memory.dmp

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memory/772-2-0x0000000004A80000-0x0000000004B1C000-memory.dmp

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memory/3440-10-0x0000000005330000-0x0000000005340000-memory.dmp

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memory/3440-13-0x0000000005330000-0x0000000005340000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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