asyncrat | 4a9683f3b6658f4895cd3d44c4920d77db5dfd410cf0dc188e4f4d2740c24539

General

Target

Factura 0000000065.xll
Size

638KB
MD5

a673f1b64b97384cdb86e148a94188e8
SHA1

2f924ea70a3a8c7b3c5808af437cb895f90f588a
SHA256

4a9683f3b6658f4895cd3d44c4920d77db5dfd410cf0dc188e4f4d2740c24539
SHA512

0eaaf0d09a828b7289e75e3c92bfb70b5a168031b7670f6eb6c74a0104b448b58f9bb30a09295141e23d0ea60b4571d9f0b220b4e61c38fd81197fc31e254002

Score

10^/10

asyncrat 1 persistence rat spyware stealer

Malware Config

Extracted

Family

asyncrat

Version

0.5.7B

Botnet

1

C2

212.193.30.54:8755

Mutex

gyQ12!.,=FD7trew

Attributes

anti_vm
false
bsod
false
delay
3
install
false
install_folder
%AppData%
pastebin_config
null

aes.plain

Signatures

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

Async RAT payload 4 IoCs

rat

Processes:

resource	yara_rule
behavioral1/memory/288-80-0x0000000000400000-0x0000000000412000-memory.dmp	asyncrat
behavioral1/memory/288-81-0x0000000000400000-0x0000000000412000-memory.dmp	asyncrat
behavioral1/memory/288-82-0x0000000000400000-0x0000000000412000-memory.dmp	asyncrat
behavioral1/memory/288-83-0x0000000000400000-0x0000000000412000-memory.dmp	asyncrat

Downloads MZ/PE file
Executes dropped EXE 1 IoCs

Processes:

poa70b.exe

pid process

432 poa70b.exe
Loads dropped DLL 3 IoCs

Processes:

EXCEL.EXE

pid process

1680 EXCEL.EXE
1680 EXCEL.EXE
1680 EXCEL.EXE
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081

pid	process
432	poa70b.exe

pid	process
1680	EXCEL.EXE
1680	EXCEL.EXE
1680	EXCEL.EXE

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

poa70b.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-3846991908-3261386348-1409841751-1000\Software\Microsoft\Windows\CurrentVersion\Run\Dslfiip = "\"C:\\Users\\Admin\\AppData\\Roaming\\Cltjej\\Dslfiip.exe\""	poa70b.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

poa70b.exe

description pid process target process

PID 432 set thread context of 288 432 poa70b.exe MSBuild.exe
Enumerates system info in registry 2 TTPs 1 IoCs

Query Registry
T1012

System Information Discovery
T1082

Processes:

EXCEL.EXE

description ioc process

Key opened \REGISTRY\MACHINE\Hardware\Description\System\FloatingPointProcessor EXCEL.EXE

description	pid	process	target process
PID 432 set thread context of 288	432	poa70b.exe	MSBuild.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\FloatingPointProcessor	EXCEL.EXE

Modifies Internet Explorer settings 1 TTPs 9 IoCs

adware spyware

Modify Registry

T1112

Processes:

EXCEL.EXE

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-3846991908-3261386348-1409841751-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote\ = "res://C:\\PROGRA~2\\MICROS~1\\Office14\\ONBttnIE.dll/105"	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-3846991908-3261386348-1409841751-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel	EXCEL.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-3846991908-3261386348-1409841751-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel\ = "res://C:\\PROGRA~2\\MICROS~1\\Office14\\EXCEL.EXE/3000"	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-3846991908-3261386348-1409841751-1000\Software\Microsoft\Internet Explorer\Toolbar	EXCEL.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-3846991908-3261386348-1409841751-1000\Software\Microsoft\Internet Explorer\Toolbar\ShowDiscussionButton = "Yes"	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-3846991908-3261386348-1409841751-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-3846991908-3261386348-1409841751-1000\Software\Microsoft\Internet Explorer\MenuExt	EXCEL.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-3846991908-3261386348-1409841751-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote\Contexts = "55"	EXCEL.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-3846991908-3261386348-1409841751-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel\Contexts = "1"	EXCEL.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

Processes:

EXCEL.EXE

pid process

1680 EXCEL.EXE
Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

poa70b.exe

pid process

432 poa70b.exe
432 poa70b.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

EXCEL.EXEpoa70b.exe

description pid process

Token: SeDebugPrivilege 1680 EXCEL.EXE
Token: SeDebugPrivilege 432 poa70b.exe
Suspicious use of FindShellTrayWindow 2 IoCs

Processes:

EXCEL.EXE

pid process

1680 EXCEL.EXE
1680 EXCEL.EXE
Suspicious use of SendNotifyMessage 1 IoCs

Processes:

EXCEL.EXE

pid process

1680 EXCEL.EXE
Suspicious use of SetWindowsHookEx 8 IoCs

Processes:

EXCEL.EXE

pid process

1680 EXCEL.EXE
1680 EXCEL.EXE
1680 EXCEL.EXE
1680 EXCEL.EXE
1680 EXCEL.EXE
1680 EXCEL.EXE
1680 EXCEL.EXE
1680 EXCEL.EXE

pid	process
1680	EXCEL.EXE

pid	process
432	poa70b.exe
432	poa70b.exe

description	pid	process
Token: SeDebugPrivilege	1680	EXCEL.EXE
Token: SeDebugPrivilege	432	poa70b.exe

pid	process
1680	EXCEL.EXE
1680	EXCEL.EXE

pid	process
1680	EXCEL.EXE

pid	process
1680	EXCEL.EXE
1680	EXCEL.EXE
1680	EXCEL.EXE
1680	EXCEL.EXE
1680	EXCEL.EXE
1680	EXCEL.EXE
1680	EXCEL.EXE
1680	EXCEL.EXE

Suspicious use of WriteProcessMemory 13 IoCs

Processes:

EXCEL.EXEpoa70b.exe

description	pid	process	target process
PID 1680 wrote to memory of 432	1680	EXCEL.EXE	poa70b.exe
PID 1680 wrote to memory of 432	1680	EXCEL.EXE	poa70b.exe
PID 1680 wrote to memory of 432	1680	EXCEL.EXE	poa70b.exe
PID 1680 wrote to memory of 432	1680	EXCEL.EXE	poa70b.exe
PID 432 wrote to memory of 288	432	poa70b.exe	MSBuild.exe
PID 432 wrote to memory of 288	432	poa70b.exe	MSBuild.exe
PID 432 wrote to memory of 288	432	poa70b.exe	MSBuild.exe
PID 432 wrote to memory of 288	432	poa70b.exe	MSBuild.exe
PID 432 wrote to memory of 288	432	poa70b.exe	MSBuild.exe
PID 432 wrote to memory of 288	432	poa70b.exe	MSBuild.exe
PID 432 wrote to memory of 288	432	poa70b.exe	MSBuild.exe
PID 432 wrote to memory of 288	432	poa70b.exe	MSBuild.exe
PID 432 wrote to memory of 288	432	poa70b.exe	MSBuild.exe

C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE
"C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE" /dde "C:\Users\Admin\AppData\Local\Temp\Factura 0000000065.xll"
1⤵
- Loads dropped DLL
- Enumerates system info in registry
- Modifies Internet Explorer settings
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1680

C:\Users\Public\poa70b.exe
"C:\Users\Public\poa70b.exe"
2⤵
- Executes dropped EXE
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:432

C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
3⤵
PID:288

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

Credential Access

Credentials in Files

1

T1081

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Data from Local System

1

T1005

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Public\poa70b.exe
MD5
3c39836dedf6779a0207819c72238fa5

SHA1
07433edf63057fff1e96ddbf5249aa2c50f69dbd

SHA256
34694c57b7447b59d6bc6a2dba635fa320a4d4b1e550a36840fe1f2208b76d87

SHA512
f8a6810abf551f01aae3a8d7c2e6a3421aac3f0312301a5e12a28bfe9490ae064f5c8dd846113cf755a3d9b8f22b80f92b27ec6e4590b04a1629662f472a7086

Download Submit
C:\Users\Public\poa70b.exe
MD5
3c39836dedf6779a0207819c72238fa5

SHA1
07433edf63057fff1e96ddbf5249aa2c50f69dbd

SHA256
34694c57b7447b59d6bc6a2dba635fa320a4d4b1e550a36840fe1f2208b76d87

SHA512
f8a6810abf551f01aae3a8d7c2e6a3421aac3f0312301a5e12a28bfe9490ae064f5c8dd846113cf755a3d9b8f22b80f92b27ec6e4590b04a1629662f472a7086

Download Submit
\Users\Admin\AppData\Local\Temp\Factura 0000000065.xll
MD5
a673f1b64b97384cdb86e148a94188e8

SHA1
2f924ea70a3a8c7b3c5808af437cb895f90f588a

SHA256
4a9683f3b6658f4895cd3d44c4920d77db5dfd410cf0dc188e4f4d2740c24539

SHA512
0eaaf0d09a828b7289e75e3c92bfb70b5a168031b7670f6eb6c74a0104b448b58f9bb30a09295141e23d0ea60b4571d9f0b220b4e61c38fd81197fc31e254002

Download Submit
\Users\Admin\AppData\Local\Temp\Factura 0000000065.xll
MD5
a673f1b64b97384cdb86e148a94188e8

SHA1
2f924ea70a3a8c7b3c5808af437cb895f90f588a

SHA256
4a9683f3b6658f4895cd3d44c4920d77db5dfd410cf0dc188e4f4d2740c24539

SHA512
0eaaf0d09a828b7289e75e3c92bfb70b5a168031b7670f6eb6c74a0104b448b58f9bb30a09295141e23d0ea60b4571d9f0b220b4e61c38fd81197fc31e254002

Download Submit
\Users\Public\poa70b.exe
MD5
3c39836dedf6779a0207819c72238fa5

SHA1
07433edf63057fff1e96ddbf5249aa2c50f69dbd

SHA256
34694c57b7447b59d6bc6a2dba635fa320a4d4b1e550a36840fe1f2208b76d87

SHA512
f8a6810abf551f01aae3a8d7c2e6a3421aac3f0312301a5e12a28bfe9490ae064f5c8dd846113cf755a3d9b8f22b80f92b27ec6e4590b04a1629662f472a7086

Download Submit
memory/288-78-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/288-81-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/288-86-0x0000000000720000-0x0000000000721000-memory.dmp

Filesize
4KB

Download
memory/288-85-0x0000000076421000-0x0000000076423000-memory.dmp

Filesize
8KB

Download
memory/288-84-0x000000006C5DE000-0x000000006C5DF000-memory.dmp

Filesize
4KB

Download
memory/288-83-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/288-82-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/288-79-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/288-80-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/432-73-0x0000000000BC0000-0x0000000000C6E000-memory.dmp

Filesize
696KB

Download
memory/432-77-0x0000000000B60000-0x0000000000BAC000-memory.dmp

Filesize
304KB

Download
memory/432-76-0x0000000004CF0000-0x0000000004CF1000-memory.dmp

Filesize
4KB

Download
memory/432-75-0x0000000002200000-0x000000000229E000-memory.dmp

Filesize
632KB

Download
memory/432-74-0x000000006C5DE000-0x000000006C5DF000-memory.dmp

Filesize
4KB

Download
memory/1680-55-0x0000000071301000-0x0000000071303000-memory.dmp

Filesize
8KB

Download
memory/1680-66-0x0000000005133000-0x0000000005134000-memory.dmp

Filesize
4KB

Download
memory/1680-56-0x000000005FFF0000-0x0000000060000000-memory.dmp

Filesize
64KB

Download
memory/1680-57-0x00000000722ED000-0x00000000722F8000-memory.dmp

Filesize
44KB

Download
memory/1680-69-0x000000000513B000-0x000000000514C000-memory.dmp

Filesize
68KB

Download
memory/1680-54-0x000000002FC11000-0x000000002FC14000-memory.dmp

Filesize
12KB

Download
memory/1680-68-0x0000000005135000-0x0000000005137000-memory.dmp

Filesize
8KB

Download
memory/1680-60-0x000000006C5DE000-0x000000006C5DF000-memory.dmp

Filesize
4KB

Download
memory/1680-67-0x0000000005134000-0x0000000005135000-memory.dmp

Filesize
4KB

Download
memory/1680-65-0x0000000003020000-0x000000000302A000-memory.dmp

Filesize
40KB

Download
memory/1680-64-0x0000000004580000-0x00000000045BA000-memory.dmp

Filesize
232KB

Download
memory/1680-61-0x0000000005130000-0x0000000005131000-memory.dmp

Filesize
4KB

Download
memory/1680-62-0x0000000002F90000-0x0000000002FAC000-memory.dmp

Filesize
112KB

Download
memory/1680-63-0x0000000005131000-0x0000000005132000-memory.dmp

Filesize
4KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads