asyncrat | 2efe493bb7af6e276db22c15df9358e2fc72a6281d08d3bde2050653d8b285a0

General

Target

76BVN200706awbinformation_PDF.exe
Size

5.1MB
MD5

1082b9039a4b9fafd5d6c40663bed8a2
SHA1

7f9a433442b492d6860dcab52b4aa83bfb495222
SHA256

ec4f62108a0efc101539e57198ffffaac7be084e792b43daeb4561881c0fc2f2
SHA512

dfdade40ac974165dbff9e0d40be375416a7116f13e6769d366452d352562dcee65a1c7c0bf894e405d9e83a355fdcb7171b0525aaac6c4733d3eb4695efbc41

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/1004-54-0x0000000000D50000-0x0000000001272000-memory.dmp	asyncrat
\Users\Admin\AppData\Roaming\vgbuild.exe	asyncrat
C:\Users\Admin\AppData\Roaming\vgbuild.exe	asyncrat
C:\Users\Admin\AppData\Roaming\vgbuild.exe	asyncrat
behavioral1/memory/1968-63-0x0000000000EB0000-0x00000000013D2000-memory.dmp	asyncrat
behavioral1/memory/524-71-0x0000000000400000-0x0000000000412000-memory.dmp	asyncrat
behavioral1/memory/524-72-0x0000000000400000-0x0000000000412000-memory.dmp	asyncrat
behavioral1/memory/524-73-0x0000000000400000-0x0000000000412000-memory.dmp	asyncrat
behavioral1/memory/524-74-0x000000000040C75E-mapping.dmp	asyncrat
behavioral1/memory/524-77-0x0000000000400000-0x0000000000412000-memory.dmp	asyncrat
behavioral1/memory/524-79-0x0000000000400000-0x0000000000412000-memory.dmp	asyncrat

Executes dropped EXE 2 IoCs

Processes:

vgbuild.exeAddInProcess32.exe

pid process

1968 vgbuild.exe
524 AddInProcess32.exe
Loads dropped DLL 2 IoCs

Processes:

76BVN200706awbinformation_PDF.exevgbuild.exe

pid process

1004 76BVN200706awbinformation_PDF.exe
1968 vgbuild.exe

pid	process
1968	vgbuild.exe
524	AddInProcess32.exe

pid	process
1004	76BVN200706awbinformation_PDF.exe
1968	vgbuild.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-1-5-21-2277218442-1199762539-2004043321-1000\Software\Microsoft\Windows\CurrentVersion\Run	reg.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2277218442-1199762539-2004043321-1000\Software\Microsoft\Windows\CurrentVersion\Run\gvbuild = "C:\\Windows\\system32\\pcalua.exe -a C:\\Users\\Admin\\AppData\\Roaming\\vgbuild.exe"	reg.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs

Web Service
T1102
Suspicious use of SetThreadContext 1 IoCs

Processes:

vgbuild.exe

description pid process target process

PID 1968 set thread context of 524 1968 vgbuild.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

description	pid	process	target process
PID 1968 set thread context of 524	1968	vgbuild.exe	AddInProcess32.exe

Modifies system certificate store 2 TTPs 2 IoCs

evasion spyware trojan

Install Root Certificate

T1130

Modify Registry

T1112

Processes:

AddInProcess32.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\D4DE20D05E66FC53FE1A50882C78DB2852CAE474	AddInProcess32.exe
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\D4DE20D05E66FC53FE1A50882C78DB2852CAE474\Blob = 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	AddInProcess32.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

Processes:

76BVN200706awbinformation_PDF.exevgbuild.exe

pid process

1004 76BVN200706awbinformation_PDF.exe
1004 76BVN200706awbinformation_PDF.exe
1968 vgbuild.exe
1968 vgbuild.exe
1968 vgbuild.exe

pid	process
1004	76BVN200706awbinformation_PDF.exe
1004	76BVN200706awbinformation_PDF.exe
1968	vgbuild.exe
1968	vgbuild.exe
1968	vgbuild.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

76BVN200706awbinformation_PDF.exevgbuild.exeAddInProcess32.exe

description	pid	process
Token: SeDebugPrivilege	1004	76BVN200706awbinformation_PDF.exe
Token: SeDebugPrivilege	1968	vgbuild.exe
Token: SeDebugPrivilege	524	AddInProcess32.exe

Suspicious use of WriteProcessMemory 21 IoCs

Processes:

76BVN200706awbinformation_PDF.execmd.exevgbuild.exe

description	pid	process	target process
PID 1004 wrote to memory of 1872	1004	76BVN200706awbinformation_PDF.exe	cmd.exe
PID 1004 wrote to memory of 1872	1004	76BVN200706awbinformation_PDF.exe	cmd.exe
PID 1004 wrote to memory of 1872	1004	76BVN200706awbinformation_PDF.exe	cmd.exe
PID 1004 wrote to memory of 1872	1004	76BVN200706awbinformation_PDF.exe	cmd.exe
PID 1872 wrote to memory of 1724	1872	cmd.exe	reg.exe
PID 1872 wrote to memory of 1724	1872	cmd.exe	reg.exe
PID 1872 wrote to memory of 1724	1872	cmd.exe	reg.exe
PID 1872 wrote to memory of 1724	1872	cmd.exe	reg.exe
PID 1004 wrote to memory of 1968	1004	76BVN200706awbinformation_PDF.exe	vgbuild.exe
PID 1004 wrote to memory of 1968	1004	76BVN200706awbinformation_PDF.exe	vgbuild.exe
PID 1004 wrote to memory of 1968	1004	76BVN200706awbinformation_PDF.exe	vgbuild.exe
PID 1004 wrote to memory of 1968	1004	76BVN200706awbinformation_PDF.exe	vgbuild.exe
PID 1968 wrote to memory of 524	1968	vgbuild.exe	AddInProcess32.exe
PID 1968 wrote to memory of 524	1968	vgbuild.exe	AddInProcess32.exe
PID 1968 wrote to memory of 524	1968	vgbuild.exe	AddInProcess32.exe
PID 1968 wrote to memory of 524	1968	vgbuild.exe	AddInProcess32.exe
PID 1968 wrote to memory of 524	1968	vgbuild.exe	AddInProcess32.exe
PID 1968 wrote to memory of 524	1968	vgbuild.exe	AddInProcess32.exe
PID 1968 wrote to memory of 524	1968	vgbuild.exe	AddInProcess32.exe
PID 1968 wrote to memory of 524	1968	vgbuild.exe	AddInProcess32.exe
PID 1968 wrote to memory of 524	1968	vgbuild.exe	AddInProcess32.exe

C:\Users\Admin\AppData\Local\Temp\76BVN200706awbinformation_PDF.exe
"C:\Users\Admin\AppData\Local\Temp\76BVN200706awbinformation_PDF.exe"
1⤵
- Loads dropped DLL
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1004

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c REG ADD HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run /f /v gvbuild /t REG_SZ /d C:\Windows\system32\pcalua.exe" -a C:\Users\Admin\AppData\Roaming\vgbuild.exe"
2⤵
- Suspicious use of WriteProcessMemory
PID:1872

C:\Windows\SysWOW64\reg.exe
REG ADD HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run /f /v gvbuild /t REG_SZ /d C:\Windows\system32\pcalua.exe" -a C:\Users\Admin\AppData\Roaming\vgbuild.exe"
3⤵
- Adds Run key to start application
PID:1724

C:\Users\Admin\AppData\Roaming\vgbuild.exe
"C:\Users\Admin\AppData\Roaming\vgbuild.exe"
2⤵
- Executes dropped EXE
- Loads dropped DLL
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1968

C:\Users\Admin\AppData\Local\Temp\AddInProcess32.exe
"C:\Users\Admin\AppData\Local\Temp\AddInProcess32.exe"
3⤵
- Executes dropped EXE
- Modifies system certificate store
- Suspicious use of AdjustPrivilegeToken
PID:524

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

2

T1112

Install Root Certificate

1

T1130

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\vgbuild.exe
Filesize
5.1MB

MD5
1082b9039a4b9fafd5d6c40663bed8a2

SHA1
7f9a433442b492d6860dcab52b4aa83bfb495222

SHA256
ec4f62108a0efc101539e57198ffffaac7be084e792b43daeb4561881c0fc2f2

SHA512
dfdade40ac974165dbff9e0d40be375416a7116f13e6769d366452d352562dcee65a1c7c0bf894e405d9e83a355fdcb7171b0525aaac6c4733d3eb4695efbc41

Download Submit
C:\Users\Admin\AppData\Roaming\vgbuild.exe
Filesize
5.1MB

MD5
1082b9039a4b9fafd5d6c40663bed8a2

SHA1
7f9a433442b492d6860dcab52b4aa83bfb495222

SHA256
ec4f62108a0efc101539e57198ffffaac7be084e792b43daeb4561881c0fc2f2

SHA512
dfdade40ac974165dbff9e0d40be375416a7116f13e6769d366452d352562dcee65a1c7c0bf894e405d9e83a355fdcb7171b0525aaac6c4733d3eb4695efbc41

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\vgbuild.exe
Filesize
5.1MB

MD5
1082b9039a4b9fafd5d6c40663bed8a2

SHA1
7f9a433442b492d6860dcab52b4aa83bfb495222

SHA256
ec4f62108a0efc101539e57198ffffaac7be084e792b43daeb4561881c0fc2f2

SHA512
dfdade40ac974165dbff9e0d40be375416a7116f13e6769d366452d352562dcee65a1c7c0bf894e405d9e83a355fdcb7171b0525aaac6c4733d3eb4695efbc41

Download Submit
memory/524-71-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/524-72-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/524-79-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/524-77-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/524-74-0x000000000040C75E-mapping.dmp

Download
memory/524-73-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/524-69-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/524-68-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/1004-56-0x0000000074DE1000-0x0000000074DE3000-memory.dmp

Filesize
8KB

Download
memory/1004-54-0x0000000000D50000-0x0000000001272000-memory.dmp

Filesize
5.1MB

Download
memory/1004-55-0x00000000002F0000-0x00000000002FA000-memory.dmp

Filesize
40KB

Download
memory/1724-58-0x0000000000000000-mapping.dmp

Download
memory/1872-57-0x0000000000000000-mapping.dmp

Download
memory/1968-60-0x0000000000000000-mapping.dmp

Download
memory/1968-65-0x0000000000520000-0x0000000000528000-memory.dmp

Filesize
32KB

Download
memory/1968-63-0x0000000000EB0000-0x00000000013D2000-memory.dmp

Filesize
5.1MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads