Emotet — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 fde0fd99d74a9331…

MALICIOUS

Office (OLE) / .XLS

40.0 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel First seen: 2022-05-12
MD5: c6788a4c0b6f0a089c7b778f3c36bbd8 SHA-1: 0bb72c15f3af44e266a34839f655cf50d02121dc SHA-256: fde0fd99d74a9331d3c41840120505a0bbb9115b695e8b4e0790c0a94afe4f37
200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Service Execution: Visual Basic T1204.002 Malicious File Execution: User Execution: Malicious File

The sample contains Excel 4.0 macros, specifically an Auto_Open macro, which is a known technique for executing malicious code. The ClamAV detection explicitly names this as an Emotet downloader. The macros appear to construct URLs from concatenated strings, which are then likely used to download and execute a second-stage payload. The extracted URLs are suspicious and align with this downloader behavior.

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.
  • XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • ClamAV: Xls.Downloader.Emotet-adc2d23d2dc26dd0-9950240-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Emotet-adc2d23d2dc26dd0-9950240-0
  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
214b0200160a0a56c6b45537e99f08bf5e131e2710192ec67ed6ddfaa9428b75
xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6825 bytes