Office (OOXML) / .XLSM malware analysis — malicious · da8b8f45b6446e84

MALICIOUS

Office (OOXML) / .XLSM

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

MD5: a774b50069d0f7d4f9402dc4429cf57c SHA-1: b32d08122ac0db4a8cdf23fc78ce660e09f5abed SHA-256: da8b8f45b6446e84e539e1f6244d7b03dc822cf5649e0e8602f6e32cfc41597f

180 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1566.002 Spearphishing Attachment

The presence of a Workbook_Open macro and a CreateObject call strongly suggests that the VBA code within this XLSM file is designed to execute automatically upon opening. This macro likely serves as a downloader for a secondary payload. While no specific URLs were extracted, the heuristic firings indicate a malicious intent typical of macro-based malware delivery.

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` `e3414a42e8c5a40c6507530b04fb9f087ad62317f131710504f9fef05da780ac`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	6369 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` `1eb96e7cc8deacf5d8a0724513aaf03bc40c4029e6818ec4e796eae3fe945c93`	vba-project	OOXML VBA project: xl/vbaProject.bin	28160 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.

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