Office (OOXML) / .XLSX malware analysis — malicious · eff9b98d2c1db45c

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 105dcee7b8a2d60bc861f084213645f0 SHA-1: d7bedaffef7668a375b6df082122f8fe6c209841 SHA-256: eff9b98d2c1db45cbba6e3205094ab2d1873c0b5516dc3df3535d7b2d80fd5c2

208 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell

The OOXML file contains VBA macros, specifically a Workbook_Open macro that utilizes the Shell() function. This indicates an attempt to execute arbitrary commands, typically for downloading and running additional malicious content. The presence of VBA macros and the use of Shell() are strong indicators of a downloader or initial access mechanism.

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` `a4afa54aada42fac4ab7f9b41f3ff0ecae151048761d7a88560e597bc2a054ec`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	4485 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` `bf200140578e03f665eb39efdeb7f8851f4f90423afbf131e09ff2a5590afe09`	vba-project	OOXML VBA project: xl/vbaProject.bin	17920 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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