Office (OLE) / .XLS malware analysis — malicious · b5b5645104214da4

MALICIOUS

Office (OLE) / .XLS

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

MD5: 4d1975ea59374e3169e31473551fb820 SHA-1: 8f40bc0f787194d205ffc1eebcadf0e6cbd3db44 SHA-256: b5b5645104214da44c13779a078895adbb65e0d002a37db392bea7e181b199a7

120 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.005 Visual Basic T1218.011 Rundll32

The sample is an Excel 4.0 macro-enabled spreadsheet that impersonates DocuSign to lure the user into enabling macros. Upon enabling, it executes Excel 4.0 macros that appear to use rundll32 to download and execute a payload from one of the listed URLs. The specific macro commands and reconstructed strings like 'rundll32', 'DllRegisterServer', 'uRlMon', and 'RLDownloadToFileA' indicate a downloader functionality.

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
Document signing service impersonation lure medium SE_DOCUSIGN_LURE

Document impersonates DocuSign, Adobe Sign, or a similar signing service in a signing-request context

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `22d3c31a465a6521900f39daf43eabaae00bc8bddcdeb66e5f53b58d567f7430`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	2285 bytes

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