Office (OLE) / .XLSX malware analysis — malicious · 2e8191a3cf1567ea

MALICIOUS

Office (OLE) / .XLSX

105.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-05-31

MD5: 871b1d98694ec98473176bb9991052d7 SHA-1: a69ed33693d1bfbcb19ebf1627552615d2cbbabd SHA-256: 2e8191a3cf1567ead866ebbc81045775d8a035f2d8e043dbb8cfbca29696989b

120 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File

The sample contains Excel 4.0 (XLM) macros with an Auto_Open entry, indicating automatic execution upon opening. It also includes a lure to enable macros, impersonating a document signing service like DocuSign. The extracted URLs and the `rundll32.exe DllRegisterServer` command suggest the macro is designed to download and execute a second-stage payload from one of the listed URLs.

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` `1f3a9e9f425000bccc6ecbbba5371f1a3b0a17ea072b52992d451728caf3ab45`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	3742 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.