Office (OLE) / .XLS malware analysis — malicious · 4f59f36330dc696f

MALICIOUS

Office (OLE) / .XLS

380.5 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel

MD5: ab1c2a91303f193340ff6ed63ec2e362 SHA-1: b18c16afb548a4aea61de8797389e49f471f312a SHA-256: 4f59f36330dc696f19ebcb20c2b5ce53e65bdb6527d51eea80e71ea2764f9d40

102 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic for Applications T1204.002 Malicious File

The sample is an Excel 4.0 (XLM) macro-enabled spreadsheet. It contains an Auto_Open macro, indicating it will execute automatically upon opening. The document body contains embedded URLs and text that appears to be part of the macro code, including calls to 'downloadFile' and 'runDll'. This strongly suggests the macro's purpose is to download and execute a second-stage payload from one of the provided URLs, using a common macro-enable lure.

Heuristics 4

Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME

oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN

Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.
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
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — context-specific rules above attribute URLs they actually evaluated; this rule lists URLs that were present in the bytes but were not otherwise tied to a specific finding.
URL https://thedeformo.com/zrbLAqMKy21Y/lena.html
- https://faithfulroofingco.com/nmsY1dCNaBRO/lena.html

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `13ea4a1fd330f9266fa91027043baa61f334e3ac691e10ce14b7c7fee97c551c`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	8812 bytes

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