Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 1aa73e9c832f5989…

MALICIOUS

Office (OLE) / .XLS

62.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 06b8180855ee79c65ed784fedd931f38 SHA-1: 4c1bb66fc6d69a3f3451485ec0bc1814367da51f SHA-256: 1aa73e9c832f59894ec69fbb05e5497aebe1a88174d1296f33f5b86fc0edca38
160 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.005 Service Execution T1566.001 Spearphishing Attachment

The sample is an Excel 4.0 macro-enabled spreadsheet designed to impersonate DocuSign to lure users into enabling macros. Upon enabling, it executes 'regsvr32.exe -s C:\Flopers\Flopers2\Bilore.dll', indicating it attempts to load and run a malicious DLL. The URL http://bmwtours.com.np/aflwjjneuxg/ was also extracted, likely serving as a download source for the payload.

Heuristics 5

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.

FilenameKindSourceSize
xlm_macros.txt
42919f6693f32a7db21ed616588027a9dbf0a80618c9894f415202c8ceb47b72		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 2351 bytes

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