Office (OOXML) / .XLSX malware analysis — malicious · f6bec3c2d0503978

MALICIOUS

Office (OOXML) / .XLSX

1.20 MB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 14.0300

MD5: 1f1082f170381d1cba07eae5f750fe7b SHA-1: 766372c48e75bfff323b4b038640872e2d5c525c SHA-256: f6bec3c2d0503978f88734c6d52f2a01552c1d24b8e014ab835827ba3c9cc548

216 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The sample is an Office document with a Workbook_Open macro that utilizes Shell() and CreateObject() calls. This indicates the macro is designed to execute arbitrary commands, likely to download and run a second-stage payload. The presence of hidden sheets and encoded blobs further supports a malicious intent. No specific family could be identified.

Heuristics 7

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)
Hidden worksheet (hidden) low OOXML_HIDDEN_SHEET

Excel workbook contains 3 hidden sheet(s) — hidden sheets are commonly used to conceal macro code, staging data, or intermediate payload construction

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `6bf246f1826f65b5e5d404176950f2953451fd5ef26247a05efe6d0b3c411135`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	4349 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` `79e3648145b1dce8f77e5972d115e462cf49f6d3a757fccc6d41db216733f7ed`	vba-project	OOXML VBA project: xl/vbaProject.bin	453632 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

Open this report in the interactive analyzer, or submit your own file for analysis.