Office (OOXML) / .XLSM malware analysis — malicious · 3a5b3f312da88cab

MALICIOUS

Office (OOXML) / .XLSM

388.7 KB Created: 2021-02-15 19:29:50 UTC Authoring application: Microsoft Excel 15.0300

MD5: f68c8be9950c348a773bc6d682c984f0 SHA-1: 1e9ef8716081dc775bfc717781facf6a80495545 SHA-256: 3a5b3f312da88cab15be0deb9d043213e23282ad00344f114cc7a5ff81760a43

180 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.005 Visual Basic T1059.001 PowerShell

The presence of a Workbook_Open macro and a CreateObject call strongly suggests that this XLSM file is designed to execute malicious code upon opening. The NOP sled and the general heuristic for suspicious extracted artifacts indicate a packed or obfuscated payload, typical of a downloader or initial access stage. No specific family could be identified, but the execution method is common for malware delivery.

Heuristics 5

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

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `c73fee795fe5f8e4b6c7a8516ce745c89bbb3cac90c89cbcef4b00407ace18fa`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	5239 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` `2ea34f6d630e73be54183d7ddd01e4766d717aed5951130c55f794b879a51015`	vba-project	OOXML VBA project: xl/vbaProject.bin	24576 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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