Office (OOXML) / .XLSX malware analysis — malicious · cd197ac98e2c6597

MALICIOUS

Office (OOXML) / .XLSX

132.3 KB Created: 2020-05-02 09:14:21 UTC Authoring application: Microsoft Excel 16.0300

MD5: 45efd42402270c8c2c50a46bff38b00e SHA-1: 8ac1927cf9e6b5c753009932ac4660a39939e2a3 SHA-256: cd197ac98e2c65978a6b1140addf32eb0cf275785944e0b2d29400a4316ff718

208 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059 Command and Scripting Interpreter

The OOXML file contains a Workbook_Open VBA macro, which is a common technique for initial execution. This macro utilizes the Shell() function, indicating an intent to execute arbitrary commands, likely to download and run a second-stage payload. The presence of VBA macros and the use of Shell() are strong indicators of malicious intent.

Heuristics 6

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
VBA project inside OOXML medium OOXML_VBA

Document contains vbaProject.bin — VBA macros present
Environ() call (env variable access) low OLE_VBA_ENVIRON

Environ() call (env variable access)

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `c002ace313a3b552a528d794254c8560d551fe4e2c5f08570e74b8a1c3a301be`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	4669 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `25afdcc01915169f63d1011f3d0b5329e6b13b54e64b9daed31baa01aa70e589`	vba-project	OOXML VBA project: xl/vbaProject.bin	17408 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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