asyncrat | a97e5481d76b90e271c62a1c62f1faa83ef2327cd639c4adfaef61f9661a9fef

General

Target

FedexTrackingClearanceInformation_PDF.exe
Size

2.1MB
MD5

49ed9fd1bfe4e4d685f014084d3b11b4
SHA1

ad9aa4dedddcd8de2d2fab04344d8f26c165537d
SHA256

f3de338bdde024a21dc1e987f41930a1b8ff9799adbab67f2345e8e648e81663
SHA512

b3ec6eae21e84345c98162c79cdd5527b14524855e1d0b8f95e599ab49f47c51aca34965446d4b6a8c93217739a7bf7fa7de19e077ad117747ab29d030bf0466

Score

10^/10

asyncrat grace overflow persistence rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.7B

Botnet

GRACE OVERFLOW

Mutex

AsyncMutex_6SI8OkPnk

Attributes

delay
3
install
false
install_folder
%AppData%
pastebin_config
https://pastebin.com/raw/Q3bqVVf9

aes.plain

Signatures

AsyncRat
AsyncRAT is designed to remotely monitor and control other computers.
rat asyncrat

Async RAT payload 11 IoCs

rat

Processes:

resource	yara_rule
behavioral1/memory/1928-54-0x0000000000E60000-0x0000000001082000-memory.dmp	asyncrat
\Users\Admin\AppData\Roaming\lfrbuild.exe	asyncrat
C:\Users\Admin\AppData\Roaming\lfrbuild.exe	asyncrat
C:\Users\Admin\AppData\Roaming\lfrbuild.exe	asyncrat
behavioral1/memory/2024-63-0x0000000000FB0000-0x00000000011D2000-memory.dmp	asyncrat
behavioral1/memory/824-71-0x0000000000400000-0x0000000000412000-memory.dmp	asyncrat
behavioral1/memory/824-72-0x0000000000400000-0x0000000000412000-memory.dmp	asyncrat
behavioral1/memory/824-73-0x0000000000400000-0x0000000000412000-memory.dmp	asyncrat
behavioral1/memory/824-74-0x000000000040C75E-mapping.dmp	asyncrat
behavioral1/memory/824-77-0x0000000000400000-0x0000000000412000-memory.dmp	asyncrat
behavioral1/memory/824-79-0x0000000000400000-0x0000000000412000-memory.dmp	asyncrat

Executes dropped EXE 2 IoCs

Processes:

lfrbuild.exeAddInProcess32.exe

pid process

2024 lfrbuild.exe
824 AddInProcess32.exe
Loads dropped DLL 2 IoCs

Processes:

FedexTrackingClearanceInformation_PDF.exelfrbuild.exe

pid process

1928 FedexTrackingClearanceInformation_PDF.exe
2024 lfrbuild.exe

pid	process
2024	lfrbuild.exe
824	AddInProcess32.exe

pid	process
1928	FedexTrackingClearanceInformation_PDF.exe
2024	lfrbuild.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

reg.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-1819626980-2277161760-1023733287-1000\Software\Microsoft\Windows\CurrentVersion\Run	reg.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1819626980-2277161760-1023733287-1000\Software\Microsoft\Windows\CurrentVersion\Run\rflbuild = "C:\\Windows\\system32\\pcalua.exe -a C:\\Users\\Admin\\AppData\\Roaming\\lfrbuild.exe"	reg.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs

Web Service
T1102
Suspicious use of SetThreadContext 1 IoCs

Processes:

lfrbuild.exe

description pid process target process

PID 2024 set thread context of 824 2024 lfrbuild.exe AddInProcess32.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082
Suspicious behavior: EnumeratesProcesses 5 IoCs

Processes:

FedexTrackingClearanceInformation_PDF.exelfrbuild.exe

pid process

1928 FedexTrackingClearanceInformation_PDF.exe
1928 FedexTrackingClearanceInformation_PDF.exe
2024 lfrbuild.exe
2024 lfrbuild.exe
2024 lfrbuild.exe

description	pid	process	target process
PID 2024 set thread context of 824	2024	lfrbuild.exe	AddInProcess32.exe

pid	process
1928	FedexTrackingClearanceInformation_PDF.exe
1928	FedexTrackingClearanceInformation_PDF.exe
2024	lfrbuild.exe
2024	lfrbuild.exe
2024	lfrbuild.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

FedexTrackingClearanceInformation_PDF.exelfrbuild.exeAddInProcess32.exe

description	pid	process
Token: SeDebugPrivilege	1928	FedexTrackingClearanceInformation_PDF.exe
Token: SeDebugPrivilege	2024	lfrbuild.exe
Token: SeDebugPrivilege	824	AddInProcess32.exe

Suspicious use of WriteProcessMemory 21 IoCs

Processes:

FedexTrackingClearanceInformation_PDF.execmd.exelfrbuild.exe

description	pid	process	target process
PID 1928 wrote to memory of 1728	1928	FedexTrackingClearanceInformation_PDF.exe	cmd.exe
PID 1928 wrote to memory of 1728	1928	FedexTrackingClearanceInformation_PDF.exe	cmd.exe
PID 1928 wrote to memory of 1728	1928	FedexTrackingClearanceInformation_PDF.exe	cmd.exe
PID 1928 wrote to memory of 1728	1928	FedexTrackingClearanceInformation_PDF.exe	cmd.exe
PID 1728 wrote to memory of 1544	1728	cmd.exe	reg.exe
PID 1728 wrote to memory of 1544	1728	cmd.exe	reg.exe
PID 1728 wrote to memory of 1544	1728	cmd.exe	reg.exe
PID 1728 wrote to memory of 1544	1728	cmd.exe	reg.exe
PID 1928 wrote to memory of 2024	1928	FedexTrackingClearanceInformation_PDF.exe	lfrbuild.exe
PID 1928 wrote to memory of 2024	1928	FedexTrackingClearanceInformation_PDF.exe	lfrbuild.exe
PID 1928 wrote to memory of 2024	1928	FedexTrackingClearanceInformation_PDF.exe	lfrbuild.exe
PID 1928 wrote to memory of 2024	1928	FedexTrackingClearanceInformation_PDF.exe	lfrbuild.exe
PID 2024 wrote to memory of 824	2024	lfrbuild.exe	AddInProcess32.exe
PID 2024 wrote to memory of 824	2024	lfrbuild.exe	AddInProcess32.exe
PID 2024 wrote to memory of 824	2024	lfrbuild.exe	AddInProcess32.exe
PID 2024 wrote to memory of 824	2024	lfrbuild.exe	AddInProcess32.exe
PID 2024 wrote to memory of 824	2024	lfrbuild.exe	AddInProcess32.exe
PID 2024 wrote to memory of 824	2024	lfrbuild.exe	AddInProcess32.exe
PID 2024 wrote to memory of 824	2024	lfrbuild.exe	AddInProcess32.exe
PID 2024 wrote to memory of 824	2024	lfrbuild.exe	AddInProcess32.exe
PID 2024 wrote to memory of 824	2024	lfrbuild.exe	AddInProcess32.exe

C:\Users\Admin\AppData\Local\Temp\FedexTrackingClearanceInformation_PDF.exe
"C:\Users\Admin\AppData\Local\Temp\FedexTrackingClearanceInformation_PDF.exe"
1⤵
- Loads dropped DLL
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1928

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c REG ADD HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run /f /v rflbuild /t REG_SZ /d C:\Windows\system32\pcalua.exe" -a C:\Users\Admin\AppData\Roaming\lfrbuild.exe"
2⤵
- Suspicious use of WriteProcessMemory
PID:1728

C:\Windows\SysWOW64\reg.exe
REG ADD HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run /f /v rflbuild /t REG_SZ /d C:\Windows\system32\pcalua.exe" -a C:\Users\Admin\AppData\Roaming\lfrbuild.exe"
3⤵
- Adds Run key to start application
PID:1544

C:\Users\Admin\AppData\Roaming\lfrbuild.exe
"C:\Users\Admin\AppData\Roaming\lfrbuild.exe"
2⤵
- Executes dropped EXE
- Loads dropped DLL
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2024

C:\Users\Admin\AppData\Local\Temp\AddInProcess32.exe
"C:\Users\Admin\AppData\Local\Temp\AddInProcess32.exe"
3⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:824

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Web Service

1

T1102

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\AddInProcess32.exe
Filesize
41KB

MD5
6a673bfc3b67ae9782cb31af2f234c68

SHA1
7544e89566d91e84e3cd437b9a073e5f6b56566e

SHA256
978a4093058aa2ebf05dc353897d90d950324389879b57741b64160825b5ec0e

SHA512
72c302372ce87ceda2a3c70a6005d3f9c112f1641bc7fe6824c718971233e66c07e2996d2785fa358566c38714c25ea812c05c7cfd2f588284849d495fd24f39

Download Submit
C:\Users\Admin\AppData\Local\Temp\AddInProcess32.exe
Filesize
41KB

MD5
6a673bfc3b67ae9782cb31af2f234c68

SHA1
7544e89566d91e84e3cd437b9a073e5f6b56566e

SHA256
978a4093058aa2ebf05dc353897d90d950324389879b57741b64160825b5ec0e

SHA512
72c302372ce87ceda2a3c70a6005d3f9c112f1641bc7fe6824c718971233e66c07e2996d2785fa358566c38714c25ea812c05c7cfd2f588284849d495fd24f39

Download Submit
C:\Users\Admin\AppData\Roaming\lfrbuild.exe
Filesize
2.1MB

MD5
49ed9fd1bfe4e4d685f014084d3b11b4

SHA1
ad9aa4dedddcd8de2d2fab04344d8f26c165537d

SHA256
f3de338bdde024a21dc1e987f41930a1b8ff9799adbab67f2345e8e648e81663

SHA512
b3ec6eae21e84345c98162c79cdd5527b14524855e1d0b8f95e599ab49f47c51aca34965446d4b6a8c93217739a7bf7fa7de19e077ad117747ab29d030bf0466

Download Submit
C:\Users\Admin\AppData\Roaming\lfrbuild.exe
Filesize
2.1MB

MD5
49ed9fd1bfe4e4d685f014084d3b11b4

SHA1
ad9aa4dedddcd8de2d2fab04344d8f26c165537d

SHA256
f3de338bdde024a21dc1e987f41930a1b8ff9799adbab67f2345e8e648e81663

SHA512
b3ec6eae21e84345c98162c79cdd5527b14524855e1d0b8f95e599ab49f47c51aca34965446d4b6a8c93217739a7bf7fa7de19e077ad117747ab29d030bf0466

Download Submit
\Users\Admin\AppData\Local\Temp\AddInProcess32.exe
Filesize
41KB

MD5
6a673bfc3b67ae9782cb31af2f234c68

SHA1
7544e89566d91e84e3cd437b9a073e5f6b56566e

SHA256
978a4093058aa2ebf05dc353897d90d950324389879b57741b64160825b5ec0e

SHA512
72c302372ce87ceda2a3c70a6005d3f9c112f1641bc7fe6824c718971233e66c07e2996d2785fa358566c38714c25ea812c05c7cfd2f588284849d495fd24f39

Download Submit
\Users\Admin\AppData\Roaming\lfrbuild.exe
Filesize
2.1MB

MD5
49ed9fd1bfe4e4d685f014084d3b11b4

SHA1
ad9aa4dedddcd8de2d2fab04344d8f26c165537d

SHA256
f3de338bdde024a21dc1e987f41930a1b8ff9799adbab67f2345e8e648e81663

SHA512
b3ec6eae21e84345c98162c79cdd5527b14524855e1d0b8f95e599ab49f47c51aca34965446d4b6a8c93217739a7bf7fa7de19e077ad117747ab29d030bf0466

Download Submit
memory/824-71-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/824-72-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/824-79-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/824-77-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/824-74-0x000000000040C75E-mapping.dmp

Download
memory/824-73-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/824-69-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/824-68-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/1544-58-0x0000000000000000-mapping.dmp

Download
memory/1728-57-0x0000000000000000-mapping.dmp

Download
memory/1928-56-0x0000000074E91000-0x0000000074E93000-memory.dmp

Filesize
8KB

Download
memory/1928-54-0x0000000000E60000-0x0000000001082000-memory.dmp

Filesize
2.1MB

Download
memory/1928-55-0x0000000000210000-0x000000000021A000-memory.dmp

Filesize
40KB

Download
memory/2024-60-0x0000000000000000-mapping.dmp

Download
memory/2024-65-0x0000000000350000-0x0000000000358000-memory.dmp

Filesize
32KB

Download
memory/2024-63-0x0000000000FB0000-0x00000000011D2000-memory.dmp

Filesize
2.1MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads