Office (OLE) / .XLS malware analysis — malicious · bb7c9efae6d6160b

MALICIOUS

Office (OLE) / .XLS

241.5 KB Created: 2009-01-30 06:42:42 Authoring application: Microsoft Excel

MD5: 8f30e0a5fd06208daf14116df480e100 SHA-1: e21944ce116faa5b6559f3b78d5e8df7380a16af SHA-256: bb7c9efae6d6160ba668fd98a604d5fa2abac1bdf0e27683085731ecab441e5a

120 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.005 Visual Basic T1140 Deobfuscate/Decode Files or Information

The sample is an Excel file containing a Workbook_Open VBA macro, which is a common technique for executing malicious code upon opening. The document body presents a fake Bill of Quantities (BoQ) to trick the user into enabling macros. The presence of VBA Chr string obfuscation and a suspicious 'macros.bas' file indicates that the macro is likely designed to download and execute a second-stage payload. The obfuscation suggests an attempt to evade detection.

Heuristics 4

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 macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
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

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `ce40dc62676129a7ffb78c501c2875efa6b3f6f9f8a8cc697ee188fdca492f38`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	82789 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 71 Chr/ChrW string-construction calls.

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