Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 2e0487c6cbecd68c…

MALICIOUS

Office (OLE)

90.0 KB Created: 2020-07-02 15:46:44 Authoring application: Microsoft Excel First seen: 2020-07-24
MD5: d1bda4049e740009dff39fe1698cb00a SHA-1: efc17b6d5cdd51832d90a71b7cfdea7248473d44 SHA-256: 2e0487c6cbecd68c83166ebf8742f9784be52dba4d77d37a359bacb33790cb76
160 Risk Score

Malware Insights

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

This Excel file contains Excel 4.0 macros, specifically an Auto_Open function, which is a known technique for executing malicious code upon opening. The presence of a 'Macro/content-enable lure' heuristic further suggests the document is designed to trick users into enabling macros. The macro sheet contains a call to a dangerous API, RUN, indicating it's intended to execute a payload.

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.
  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 29981 bytes
SHA-256: 41c3116a4fdbb3b2a8a15891f9a7f67c0958904e79695ced461b94062872b5da
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, very hidden -  Sheet
' 0085     10 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  L
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!JC6115 
' 0018     23 LABEL : Cell Value, String Constant - blrnzQfm len=0 
' 0018     23 LABEL : Cell Value, String Constant - buDrXTTS len=0 
' 0018     22 LABEL : Cell Value, String Constant - BWVxfwi len=0 
' 0018     24 LABEL : Cell Value, String Constant - cvEtZUVTY len=0 
' 0018     23 LABEL : Cell Value, String Constant - cXBDjDJR len=0 
' 0018     22 LABEL : Cell Value, String Constant - Dirrqvg len=0 
' 0018     24 LABEL : Cell Value, String Constant - dkELBgbca len=0 
' 0018     22 LABEL : Cell Value, String Constant - dqCkjXX len=0 
' 0018     20 LABEL : Cell Value, String Constant - DsYhh len=0 
' 0018     20 LABEL : Cell Value, String Constant - ekgrJ len=0 
' 0018     20 LABEL : Cell Value, String Constant - fvyCt len=0 
' 0018     22 LABEL : Cell Value, String Constant - FwhPRlO len=0 
' 0018     22 LABEL : Cell Value, String Constant - GgGRLda len=0 
' 0018     20 LABEL : Cell Value, String Constant - hDENX len=0 
' 0018     21 LABEL : Cell Value, String Constant - hnjuMb len=0 
' 0018     21 LABEL : Cell Value, String Constant - iktRMp len=0 
' 0018     23 LABEL : Cell Value, String Constant - iNwshCsj len=0 
' 0018     22 LABEL : Cell Value, String Constant - irPKnpW len=0 
' 0018     23 LABEL : Cell Value, String Constant - IYceWvYD len=0 
' 0018     24 LABEL : Cell Value, String Constant - JjKVPhQmW len=0 
' 0018     20 LABEL : Cell Value, String Constant - JvWsr len=0 
' 0018     24 LABEL : Cell Value, String Constant - KfhqOuYoV len=0 
' 0018     20 LABEL : Cell Value, String Constant - kGTGs len=0 
' 0018     20 LABEL : Cell Value, String Constant - kNRfc len=0 
' 0018     23 LABEL : Cell Value, String Constant - LCQaJJvw len=0 
' 0018     24 LABEL : Cell Value, String Constant - LNhKPdnIV len=0 
' 0018     20 LABEL : Cell Value, String Constant - logFU len=0 
' 0018     21 LABEL : Cell Value, String Constant - LYxxZh len=0 
' 0018     23 LABEL : Cell Value, String Constant - MBhpqotR len=0 
' 0018     20 LABEL : Cell Value, String Constant - mDVpJ len=0 
' 0018     24 LABEL : Cell Value, String Constant - mMmxrKHez len=0 
' 0018     23 LABEL : Cell Value, String Constant - nDvfNQkN len=0 
' 0018     20 LABEL : Cell Value, String Constant - njXri len=0 
' 0018     24 LABEL : Cell Value, String Constant - nkHcCHEPS len=0 
' 0018     21 LABEL : Cell Value, String Constant - nqtlKZ len=0 
' 0018     24 LABEL : Cell Value, String Constant - NwehCeiws len=0 
' 0018     23 LABEL : Cell Value, String Constant - oCyhuUUv len=0 
' 0018     24 LABEL : Cell Value, String Constant - oPaUmjHcB len=0 
' 0018     21 LABEL : Cell Value, String Constant - OZTlUr len=0 
' 0018     23 LABEL : Cell Value, String Constant - pNUbGSSh len=0 
' 0018     24 LABEL : Cell Value, String Constant - qzXSvxeyE len=0 
' 0018     24 LABEL : Cell Value, String Constant - SkwkicurO len=0 
' 0018     22 LABEL : Cell Value, String Constant - spBSgCp len=0 
' 0018     24 LABEL : Cell Value, String Constant - STopzXEhx len=0 
' 0018     22 LABEL : Cell Value, String Constant - SUMlBsd len=0 
' 0018     20 LABEL : Cell Value, String Constant - SWYQp len=0 
' 0018     22 LABEL : Cell Value, String Constant - teXeJjV len=0 
' 0018     23 LABEL : Cell Value, String Constant - TwbZHvQH len=0 
' 0018     21 LABEL : Cell Value, String Constant - tWpVsL len=0 
' 0018     27 LABEL : Cell Value, String Constant - uPGwKUEDqcEa len=0 
' 0018     22 LABEL : Cell Value, String Constant - UqoRyQC len=0 
' 0018     21 LABEL : Cell Value, String Constant - uvFPKn len=0 
' 0018     23 LABEL : Cell Value, String Constant - VglhtLZh len=0 
' 0018     27 LABEL : Cell Value, String Constant - VjRiUYxmjdvs len=0 
' 0018     20 LABEL : Cell Value, String Constant - VLqzz len=0 
' 0018     20 LABEL
... (truncated)

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