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

Static analysis result for SHA-256 88e13e1c6c602f7c…

MALICIOUS

Office (OLE) / .XLS

58.5 KB Created: 2021-03-01 12:45:09 Authoring application: Microsoft Excel
MD5: 6958ac98f7ff62b24248da326f3e0b1d SHA-1: bddff78b8631f373886a153286728f375099727c SHA-256: 88e13e1c6c602f7c65d0313e2fa8c7bc15dc4b0cc8999542f4be1521a7ac12a3
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic

The sample is an Excel 4.0 macro-enabled workbook that uses an "enable content" lure to prompt the user to enable macros. The extracted script content indicates that the macro is designed to download and execute a second-stage payload from the embedded URL 'http://evil.tld/payload' and establish persistence by writing to the Run key 'HKCU\Software\Microsoft\Windows\CurrentVersion\Run\IAccessible2Proxy'.

Heuristics 4

  • XLM Auto_Open workbook with payload URL or enable-content lure critical OLE_XLM_AUTOOPEN_PAYLOAD_LURE
    Workbook contains an Excel 4.0 macro sheet with Auto_Open / Auto_Close and also exposes a payload URL or enable-content lure in the OLE bytes. This combination is a high-confidence XLM downloader/social-engineering pattern even when formula recovery cannot decode the full macro chain.
  • Excel 4.0 (XLM) Auto_Open + macro sheet critical OLE_XLM_AUTOOPEN
    Workbook contains an Auto_Open / Auto_Close defined name together with an Excel 4.0 macro sheet — the canonical XLM auto-execution shape used by malware families such as Emotet and QakBot.
  • 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.
  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
3bbba7cf08e2f5dca2b0608522a4f92c46dbcd08cc7813213d85bc826f70c6b1		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 51547 bytes

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