Office (OLE) / .XLS malware analysis — malicious · ac19a69ec2447f93

MALICIOUS

Office (OLE) / .XLS

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

MD5: 14c0542398cbaef1d9af63251421b98a SHA-1: 551573b182732e2a6186e68df01a0e34deaa6c49 SHA-256: ac19a69ec2447f931265ecddd20e08267e877d6723105b4a079e05fd8971ccfe

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 uses an Auto_Open macro to execute. It impersonates DocuSign to trick the user into enabling macros. The macro sheet contains calls to rundll32 with DllRegisterServer, uRlMon, and RLDownloadToFileA, indicating it likely downloads and executes a second-stage payload from one of the provided URLs. The specific family is not identifiable from the available evidence.

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` `8fc8eb4fe0d112b1cb5ac2ce2296b7e1ea4a0d10df9396b6e155f9c8f50eb7a8`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	2293 bytes

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