Office (OLE) / .XLS malware analysis — malicious · fc8bbe7b84a60771

MALICIOUS

Office (OLE) / .XLS

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

MD5: 8432ec3b0604d96a7ec137b80ac050a2 SHA-1: 63dfe8269e0451a0a54d91706d85132f50188ea0 SHA-256: fc8bbe7b84a60771d654fb9efd2cc848e3f3ffe72ce3bb395326d9a15fbd1f59

180 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File T1059.001 PowerShell T1059.003 Windows Command Shell

The sample is an Excel 4.0 macro-enabled spreadsheet that uses an Auto_Open macro to execute. It impersonates a DocuSign service to trick the user into enabling macros. The presence of the URLDownloadToFileA API call and multiple suspicious URLs indicates the macro's intent is to download and execute a second-stage payload from one of the listed domains.

Heuristics 5

Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD

Reference to URLDownloadToFile API
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` `ee1b15c5e2d94ff2be8d0d0effa20538ee2f21b625adf4d7c0b80df125244ac2`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	1668 bytes

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