Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 14962b44f8c9e65a…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:39:58 Authoring application: Microsoft Excel First seen: 2021-10-23
MD5: 5ce95cbcc20b9bb63805b90c2acf9b2a SHA-1: a90f4d612ef7c28a07df4bad6c5ed37aad70e6ed SHA-256: 14962b44f8c9e65a0560e52a119a8830687e0ace22803b5e3f52d513dffc9e48
140 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro-enabled workbook. Static analysis detected critical heuristics indicating the presence of an Auto_Open macro and the use of dangerous formula APIs, specifically the RUN function. This suggests the macro is designed to execute arbitrary code upon opening, likely to download and run a second-stage payload.

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) 6413 bytes
SHA-256: 8a6e9f8d7368172931bae98587e86bb85838f2c7fd95fe1b71eac510e3d03a3d
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  uyp
' 0018     27 LABEL : Cell Value, String Constant - akgdmoJciezP len=0 
' 0018     27 LABEL : Cell Value, String Constant - AOGjmmJXSxBS len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B161 
' 0018     21 LABEL : Cell Value, String Constant - BRnncN len=0 
' 0018     27 LABEL : Cell Value, String Constant - cDBaPnetqjQy len=0 
' 0018     24 LABEL : Cell Value, String Constant - CecKgWMlC len=0 
' 0018     21 LABEL : Cell Value, String Constant - FgdFlJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - fidkvJqe len=0 
' 0018     20 LABEL : Cell Value, String Constant - fOQda len=0 
' 0018     25 LABEL : Cell Value, String Constant - jgUuBCsqeT len=0 
' 0018     25 LABEL : Cell Value, String Constant - jTmVBVLaPl len=0 
' 0018     22 LABEL : Cell Value, String Constant - mQmHxdp len=0 
' 0018     27 LABEL : Cell Value, String Constant - oOzkjVyeTuxW len=0 
' 0018     27 LABEL : Cell Value, String Constant - oYhhPDTBnFDK len=0 
' 0018     26 LABEL : Cell Value, String Constant - QAfewTpgTrT len=0 
' 0018     25 LABEL : Cell Value, String Constant - qfSkWROnYA len=0 
' 0018     24 LABEL : Cell Value, String Constant - RIFYRrhFw len=0 
' 0018     24 LABEL : Cell Value, String Constant - roEyfjlYT len=0 
' 0018     22 LABEL : Cell Value, String Constant - RRUANpq len=0 
' 0018     21 LABEL : Cell Value, String Constant - ZCZWDW len=0 
' 0018     24 LABEL : Cell Value, String Constant - ZtoeFDuZX 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
'
... (truncated)

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