Office (OOXML) / .XLSX malware analysis — malicious · c9843b6e4015374f

MALICIOUS

Office (OOXML) / .XLSX

90.0 KB Created: 2001-12-21 16:06:12 UTC Authoring application: Microsoft Excel 12.0000

MD5: 998a996a2371923b05250adc50f2c88c SHA-1: 5dcff5955a7d6f0d5cb09074663feda9e8b6fe83 SHA-256: c9843b6e4015374ff8049d9f0fed174a1aa690d7da3cb459922eae885006184a

196 Risk Score

Malware Insights

MITRE ATT&CK

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

The OOXML file contains a Workbook_Open macro that is designed to execute arbitrary commands. The macro constructs a string using values from cells and environment variables, writes this string to a file, and then executes it using the Shell() function. This indicates a downloader or dropper functionality, aiming to execute a second-stage payload. The presence of a macro-enable lure further supports this malicious intent.

Heuristics 7

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
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
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
Environ() call (env variable access) low OLE_VBA_ENVIRON

Environ() call (env variable access)
Fake invoice / payment lure low SE_INVOICE_LURE

Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `6b86b0861b4615353e03da075669bed9f306925c3f78527095e23fff240eb35e`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1918 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` `817b7a55a68ad566e1acaa9c791efbf40046ca5ab95dcc35130723a069bbbcf2`	vba-project	OOXML VBA project: xl/vbaProject.bin	13824 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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