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

Static analysis result for SHA-256 06d11694e59c619e…

MALICIOUS

Office (OLE) / .XLS

367.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: d58acd55e1ce39e1af5b5088f95edabb SHA-1: 6e61b292e1bc0530efd594e675aaf4410d863079 SHA-256: 06d11694e59c619e48e06fdb17b839b3bf10fb702c105f7fb63d743e40f15301
102 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 (XLM) macro-enabled spreadsheet that contains an Auto_Open entry, indicating automatic execution upon opening. It also contains heuristics for an 'enable lure', instructing the user to enable macros. The macro sheet contains obfuscated strings that reconstruct two URLs, which are likely used to download a second-stage payload. The presence of an Auto_Open macro and the lure to enable macros strongly suggest a malicious intent to execute arbitrary code.

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
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://escolamundoazul.com.br/ntmQmwXnc6KC/ue.html
    • https://laresumeservice.com/wp7rTKrY/ue.html

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
e0f9b32b2cf7d5bbad99732afb6eb8bf95619170305ebee6a87504bc690cca2a		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 8209 bytes

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