doubleback | 59de5c70ad1a5134fda141c933380bf1e55eb52e041ff37cf5394f8b9dcb5767

Resubmissions

03-06-2021 10:37

210603-tks7epc9ka 10

01-06-2021 16:54

210601-fpxsgwd8p2 10

Analysis

max time kernel
72s
max time network
134s
platform
windows10_x64
resource
win10v20210410
submitted
01-06-2021 16:54

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General

Target

document-37-1849.xls
Size

187KB
MD5

c41a21a821bcdea1d3ab26ebef055eed
SHA1

912c8c1792dd33bac263df4b71242078d74741e9
SHA256

d1d0ac76e59b9e2a8ae3a433e0186d74fc61417c89fe5ee4b93c02faa1dc58f8
SHA512

ed665e9a7d3e950318628ad4ea112da063e4f156ea7d2d58fbeaa31cc2486c7d2debb779da72723d8f55bdec6b9a4b87f9d148c50b0a368c4bc5b59ac646a42a

Score

10^/10

doubleback backdoor

Malware Config

Signatures

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

DoubleBack x64 Payload 2 IoCs

resource	yara_rule
behavioral2/files/0x000200000001561d-183.dat	family_doubleback_x64
behavioral2/files/0x000200000001561d-184.dat	family_doubleback_x64

DoubleBack x86 Payload 2 IoCs

resource	yara_rule
behavioral2/files/0x000200000001561d-183.dat	family_doubleback_x86
behavioral2/files/0x000200000001561d-184.dat	family_doubleback_x86

Process spawned unexpected child process 1 IoCs

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

description	pid	pid_target	Process	procid_target
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	3040	3056	cmd.exe	67

Executes dropped EXE 1 IoCs

pid	Process
2352	pDImcT.exe

Loads dropped DLL 1 IoCs

pid	Process
2352	pDImcT.exe

Checks processor information in registry 2 TTPs 3 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\CentralProcessor\0	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	EXCEL.EXE

Enumerates system info in registry 2 TTPs 3 IoCs

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemSKU	EXCEL.EXE
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\BIOS	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemFamily	EXCEL.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
3056	EXCEL.EXE

Suspicious use of FindShellTrayWindow 2 IoCs

pid	Process
3056	EXCEL.EXE
3056	EXCEL.EXE

Suspicious use of SetWindowsHookEx 12 IoCs

pid	Process
3056	EXCEL.EXE
3056	EXCEL.EXE
3056	EXCEL.EXE
3056	EXCEL.EXE
3056	EXCEL.EXE
3056	EXCEL.EXE
3056	EXCEL.EXE
3056	EXCEL.EXE
3056	EXCEL.EXE
3056	EXCEL.EXE
3056	EXCEL.EXE
3056	EXCEL.EXE

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 3056 wrote to memory of 3040	3056	EXCEL.EXE	78
PID 3056 wrote to memory of 3040	3056	EXCEL.EXE	78
PID 3056 wrote to memory of 2352	3056	EXCEL.EXE	80
PID 3056 wrote to memory of 2352	3056	EXCEL.EXE	80
PID 3056 wrote to memory of 2352	3056	EXCEL.EXE	80

C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE
"C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE" "C:\Users\Admin\AppData\Local\Temp\document-37-1849.xls"
1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of FindShellTrayWindow
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3056
- C:\Windows\System32\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:3040
- C:\ycjqFXSM\kO2NIybn\pDImcT.exe
  "C:\ycjqFXSM\kO2NIybn\pDImcT.exe" C:\ycjqFXSM\kO2NIybn ALHJ zqtRI
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  PID:2352

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/3056-117-0x00007FFF9B3D0000-0x00007FFF9B3E0000-memory.dmp

Filesize
64KB

Download
memory/3056-123-0x000002431A510000-0x000002431C405000-memory.dmp

Filesize
31.0MB

Download
memory/3056-122-0x00007FFFBBFB0000-0x00007FFFBD09E000-memory.dmp

Filesize
16.9MB

Download
memory/3056-121-0x00007FFF9B3D0000-0x00007FFF9B3E0000-memory.dmp

Filesize
64KB

Download
memory/3056-118-0x00007FFF9B3D0000-0x00007FFF9B3E0000-memory.dmp

Filesize
64KB

Download
memory/3056-114-0x00007FF66E3D0000-0x00007FF671986000-memory.dmp

Filesize
53.7MB

Download
memory/3056-116-0x00007FFF9B3D0000-0x00007FFF9B3E0000-memory.dmp

Filesize
64KB

Download
memory/3056-115-0x00007FFF9B3D0000-0x00007FFF9B3E0000-memory.dmp

Filesize
64KB

Download

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Analysis

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General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads