Office (OLE) / .XLS malware analysis — malicious · 64967d0b1f6c0f6c

MALICIOUS

Office (OLE) / .XLS

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

MD5: be5ab1c47abc0d7a19f49b4c3af4114e SHA-1: e8ad6cc03dfb42d6d98cd685c24aeb9c825e66e1 SHA-256: 64967d0b1f6c0f6c905ff1904de7c2f556b035eacb7f8520ae2ab4b44db63a04

120 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.005 Visual Basic T1204.002 Malicious File

The sample is an Excel 4.0 macro-enabled spreadsheet that uses an Auto_Open macro to execute. It impersonates DocuSign to lure the user into enabling macros. The macro appears to be designed to download and execute a payload using functions like RLDownloadToFileA and rundll32.

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` `31c2e3d18c375031f0ede4d950904da2b2386013e7cac7415802ffc65bd56e45`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	2293 bytes

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