Office (OOXML) / .XLSM malware analysis — malicious · e08fa4239a4c5ed6

MALICIOUS

Office (OOXML) / .XLSM

73.0 KB Created: 2020-09-24 18:36:44 UTC Authoring application: Microsoft Excel 12.0000

MD5: 86a156d545f23e81be35433443bb6da2 SHA-1: c5df03d08806f1faa990ea3a71ac447aecc7185c SHA-256: e08fa4239a4c5ed68a5efd79953489da0ba5c3505c19888be83533dea837f99c

188 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The sample is a macro-enabled Excel file (XLSM) containing a Workbook_Open macro. This macro is designed to construct a command string using environment variables and then execute it via the Shell() function. The script appears to write some data to a file and then execute it, indicating a downloader or dropper functionality. The presence of a Workbook_Open macro 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
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)

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `24e6fee14f3ed226c04180a84c7756c93bed9ea2b74dcb72ad56aa373d683863`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1013 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` `944989d1351b2bf12ef85d892e48757a587c8ebbb094dd7f19b347d8ce770e7c`	vba-project	OOXML VBA project: xl/vbaProject.bin	9216 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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