Office (OOXML) / .XLSM malware analysis — malicious · 5988de02b33b85a6

MALICIOUS

Office (OOXML) / .XLSM

390.2 KB Created: 2020-10-14 16:28:11 UTC Authoring application: Microsoft Excel 16.0300

MD5: 4d0da2aab938b19f8a1cee89dcedca81 SHA-1: e491170133c950f011f927bece93369ff8a641af SHA-256: 5988de02b33b85a699c9bf68889973ab8b58a08296fa0ee3eeef4102d6ff84f2

180 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File

The file is an XLSM document containing a Workbook_Open macro, which is a common technique for executing malicious code upon opening. The heuristic firings indicate the presence of VBA macros and a suspicious NOP sled, suggesting an attempt to obfuscate or exploit. The macro likely downloads and executes a second-stage payload, as indicated by the 'CreateObject' call and the general nature of Workbook_Open macros in malicious documents. No specific URLs or executable content were directly extracted, limiting further analysis of the payload.

Heuristics 6

NOP sled detected high SC_NOP_SLED

Found 20+ consecutive 0x90 bytes
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
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://schemas.openxmlformats.org/spreadsheetml/2006/main
- http://schemas.openxmlformats.org/officeDocument/2006/relationships
- http://schemas.openxmlformats.org/markup-compatibility/2006
- http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac
- http://schemas.microsoft.com/office/spreadsheetml/2014/revision
- http://schemas.microsoft.com/office/spreadsheetml/2015/revision2
- http://schemas.microsoft.com/office/spreadsheetml/2016/revision3

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `e39bd30fd311deb9e5423de2a194859739b77fc24f23c8da923ad63dc680e772`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	5759 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `9b24b2c26ebdf3c946581d51543e4d776fba20e7857d61334c9076dc2a7b23e7`	vba-project	OOXML VBA project: xl/vbaProject.bin	26624 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.

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