doubleback | 59de5c70ad1a5134fda141c933380bf1e55eb52e041ff37cf5394f8b9dcb5767

General

Target

document-37-1849.xls
Size

187KB
MD5

c41a21a821bcdea1d3ab26ebef055eed
SHA1

912c8c1792dd33bac263df4b71242078d74741e9
SHA256

d1d0ac76e59b9e2a8ae3a433e0186d74fc61417c89fe5ee4b93c02faa1dc58f8
SHA512

ed665e9a7d3e950318628ad4ea112da063e4f156ea7d2d58fbeaa31cc2486c7d2debb779da72723d8f55bdec6b9a4b87f9d148c50b0a368c4bc5b59ac646a42a

Score

10^/10

doubleback backdoor

Malware Config

Extracted

Language

xlm4.0

Source

URLs

xlm40.dropper

https://austinheisey.com/xls/black/index/processingSetRequestDownloadPayloader/?servername=excel

Signatures

DoubleBack
DoubleBack is a modular backdoor first seen in December 2020.
backdoor doubleback

DoubleBack x64 Payload 2 IoCs

Processes:

resource	yara_rule
\ycjqFXSM\kO2NIybn\mozsqlite3.dll	family_doubleback_x64
C:\ycjqFXSM\kO2NIybn\mozsqlite3.dll	family_doubleback_x64

DoubleBack x86 Payload 2 IoCs

Processes:

resource	yara_rule
\ycjqFXSM\kO2NIybn\mozsqlite3.dll	family_doubleback_x86
C:\ycjqFXSM\kO2NIybn\mozsqlite3.dll	family_doubleback_x86

Process spawned unexpected child process 1 IoCs

This typically indicates the parent process was compromised via an exploit or macro.

Processes:

cmd.exe

description	pid	pid_target	process	target process
Parent C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE is not expected to spawn this process	1060	1832	cmd.exe	EXCEL.EXE

Downloads MZ/PE file
Executes dropped EXE 1 IoCs

Processes:

pDImcT.exe

pid process

948 pDImcT.exe
Loads dropped DLL 2 IoCs

Processes:

EXCEL.EXEpDImcT.exe

pid process

1832 EXCEL.EXE
948 pDImcT.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

pid	process
948	pDImcT.exe

pid	process
1832	EXCEL.EXE
948	pDImcT.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
Key created	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote	EXCEL.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote\Contexts = "55"	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Internet Explorer\Toolbar	EXCEL.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Internet Explorer\Toolbar\ShowDiscussionButton = "Yes"	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Internet Explorer\MenuExt	EXCEL.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\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-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel	EXCEL.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel\ = "res://C:\\PROGRA~2\\MICROS~1\\Office14\\EXCEL.EXE/3000"	EXCEL.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel\Contexts = "1"	EXCEL.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

Processes:

EXCEL.EXE

pid process

1832 EXCEL.EXE
Suspicious use of SetWindowsHookEx 3 IoCs

Processes:

EXCEL.EXE

pid process

1832 EXCEL.EXE
1832 EXCEL.EXE
1832 EXCEL.EXE

pid	process
1832	EXCEL.EXE

pid	process
1832	EXCEL.EXE
1832	EXCEL.EXE
1832	EXCEL.EXE

Suspicious use of WriteProcessMemory 8 IoCs

Processes:

EXCEL.EXE

description	pid	process	target process
PID 1832 wrote to memory of 1060	1832	EXCEL.EXE	cmd.exe
PID 1832 wrote to memory of 1060	1832	EXCEL.EXE	cmd.exe
PID 1832 wrote to memory of 1060	1832	EXCEL.EXE	cmd.exe
PID 1832 wrote to memory of 1060	1832	EXCEL.EXE	cmd.exe
PID 1832 wrote to memory of 948	1832	EXCEL.EXE	pDImcT.exe
PID 1832 wrote to memory of 948	1832	EXCEL.EXE	pDImcT.exe
PID 1832 wrote to memory of 948	1832	EXCEL.EXE	pDImcT.exe
PID 1832 wrote to memory of 948	1832	EXCEL.EXE	pDImcT.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\document-37-1849.xls
1⤵
- Loads dropped DLL
- Enumerates system info in registry
- Modifies Internet Explorer settings
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1832
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c copy "%ProgramFiles(x86)%\Internet Explorer\ExtExport.exe" C:\ycjqFXSM\kO2NIybn\pDImcT.exe
  2⤵
  - Process spawned unexpected child process
  PID:1060
- C:\ycjqFXSM\kO2NIybn\pDImcT.exe
  "C:\ycjqFXSM\kO2NIybn\pDImcT.exe" C:\ycjqFXSM\kO2NIybn ALHJ zqtRI
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  PID:948

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\ycjqFXSM\kO2NIybn\mozsqlite3.dll

MD5
9171c8fc7d3b2aeb3763d477d5718b1d

SHA1
8a6363175e7d7d4726865334e3652dd0fc9de35c

SHA256
83e0d55b4cd73be3bf89729408e8f62b1533becf3478ce5666317c3f4561ca0d

SHA512
cabce59102c66e1e123ba84417dba93c7b993b69daf981d52b6a976e12a7dc802f770fb6ba1de4a3667a49b938463891d40d632b0d55d602dee3716a46a5a8d9

Download Submit
C:\ycjqFXSM\kO2NIybn\pDImcT.exe

MD5
7f7f391491c315a4a72efcac0d34fa93

SHA1
20a18c7ea14f4e1d3044091b46d6e862b6f38708

SHA256
022577f47fb074b7d942c8f01daac778b110a373de03b3b5043e887995b09d52

SHA512
78d39d7fd02d4f6ca0e13d0eacadc842d5a104c31342202875f84a69c310ecf6d4dcc8f00e95b09de936922be0312cf956c5e955254a99113efb3f51e26c082e

Download Submit
C:\ycjqFXSM\kO2NIybn\pDImcT.exe

MD5
7f7f391491c315a4a72efcac0d34fa93

SHA1
20a18c7ea14f4e1d3044091b46d6e862b6f38708

SHA256
022577f47fb074b7d942c8f01daac778b110a373de03b3b5043e887995b09d52

SHA512
78d39d7fd02d4f6ca0e13d0eacadc842d5a104c31342202875f84a69c310ecf6d4dcc8f00e95b09de936922be0312cf956c5e955254a99113efb3f51e26c082e

Download Submit
\ycjqFXSM\kO2NIybn\mozsqlite3.dll

MD5
9171c8fc7d3b2aeb3763d477d5718b1d

SHA1
8a6363175e7d7d4726865334e3652dd0fc9de35c

SHA256
83e0d55b4cd73be3bf89729408e8f62b1533becf3478ce5666317c3f4561ca0d

SHA512
cabce59102c66e1e123ba84417dba93c7b993b69daf981d52b6a976e12a7dc802f770fb6ba1de4a3667a49b938463891d40d632b0d55d602dee3716a46a5a8d9

Download Submit
\ycjqFXSM\kO2NIybn\pDImcT.exe

MD5
7f7f391491c315a4a72efcac0d34fa93

SHA1
20a18c7ea14f4e1d3044091b46d6e862b6f38708

SHA256
022577f47fb074b7d942c8f01daac778b110a373de03b3b5043e887995b09d52

SHA512
78d39d7fd02d4f6ca0e13d0eacadc842d5a104c31342202875f84a69c310ecf6d4dcc8f00e95b09de936922be0312cf956c5e955254a99113efb3f51e26c082e

Download Submit
memory/948-66-0x0000000000000000-mapping.dmp

Download
memory/948-68-0x0000000075801000-0x0000000075803000-memory.dmp

Filesize
8KB

Download
memory/1060-63-0x0000000000000000-mapping.dmp

Download
memory/1832-60-0x000000002F7F1000-0x000000002F7F4000-memory.dmp

Filesize
12KB

Download
memory/1832-61-0x00000000713C1000-0x00000000713C3000-memory.dmp

Filesize
8KB

Download
memory/1832-62-0x000000005FFF0000-0x0000000060000000-memory.dmp

Filesize
64KB

Download

Resubmissions

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

Loading Replay Monitor...

Downloads