Office (OOXML) / .XLSM malware analysis — malicious · b556487ae4d88923

MALICIOUS

Office (OOXML) / .XLSM

331.5 KB Created: 2019-06-17 17:48:55 UTC Authoring application: Microsoft Excel 12.0000

MD5: bde2b9dc7dab9e930be10b75dcd171ef SHA-1: 8dfeed50d89f5a2264efb31e5f74816b49c148fb SHA-256: b556487ae4d889236c1626083b0c9d45a29a5c3bc4e087bf2e3245b6a18ed2db

168 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is an XLSM file 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 macro appears to be obfuscated, making it difficult to determine the exact payload, but the presence of Shell() and the Workbook_Open event strongly suggests it's a downloader or initial execution stage. The extracted VBA macro file (macros.bas) and VBA project file (vbaProject_00.bin) are listed as suspicious artifacts.

Heuristics 5

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
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` `f2a00c979874d613c9bc05434c8aad7e34e468fa0d00d5d2bca098856a1b1d6b`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1100 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` `935845b1f9de55aaf932efef4fda4b50e7bce9d66dfd20817a86b28fd1a2230d`	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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