Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c54a530f1a0f034c…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:39:29 Authoring application: Microsoft Excel First seen: 2021-09-27
MD5: 48f86a80c1f09d9a96b014b098114ca8 SHA-1: 9322a2890ca82505c04657617465e5a96ac64868 SHA-256: c54a530f1a0f034c9e87c290a25bce844264077efe51f3b52ccc949caeca39ce
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a critical finding indicating automatic execution. The presence of dangerous formula APIs like RUN further suggests malicious intent. While no specific URLs or payloads were extracted, the mechanism points to an attempt to execute arbitrary code when the document is opened.

Heuristics 3

  • 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.

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) 6935 bytes
SHA-256: 674c0609ba7903f298f992e0d2907d26e0be0fc76583f3c61d9bab7d4277ff6d
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  uvwivXayXyS
' 0018     24 LABEL : Cell Value, String Constant - aMjKOcFjb len=0 
' 0018     24 LABEL : Cell Value, String Constant - ARoRTAHDU len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F173 
' 0018     20 LABEL : Cell Value, String Constant - cDiHr len=0 
' 0018     27 LABEL : Cell Value, String Constant - fmcHIjlIrfSl len=0 
' 0018     25 LABEL : Cell Value, String Constant - FUErDHoURG len=0 
' 0018     26 LABEL : Cell Value, String Constant - gONnhcFsWGC len=0 
' 0018     27 LABEL : Cell Value, String Constant - iGXxXXmNHdor len=0 
' 0018     20 LABEL : Cell Value, String Constant - jdVim len=0 
' 0018     21 LABEL : Cell Value, String Constant - JMafXr len=0 
' 0018     23 LABEL : Cell Value, String Constant - JoQRlSlm len=0 
' 0018     25 LABEL : Cell Value, String Constant - jrYAUvMlyc len=0 
' 0018     22 LABEL : Cell Value, String Constant - kHUHpvM len=0 
' 0018     24 LABEL : Cell Value, String Constant - LKZOLjFJP len=0 
' 0018     20 LABEL : Cell Value, String Constant - Phgce len=0 
' 0018     21 LABEL : Cell Value, String Constant - TsVilL len=0 
' 0018     21 LABEL : Cell Value, String Constant - UXLNZh len=0 
' 0018     24 LABEL : Cell Value, String Constant - VWZLXhLTk len=0 
' 0018     27 LABEL : Cell Value, String Constant - YTfcJrrufcXM len=0 
' 0018     26 LABEL : Cell Value, String Constant - yTXFQieZbQc len=0 
' 0018     23 LABEL : Cell Value, String Constant - ZIyFBzbP len=0 
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00f
... (truncated)

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