Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6d31382bec103510…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:40:02 Authoring application: Microsoft Excel First seen: 2021-07-10
MD5: 40771bdae4dc2520f8b2a0a261e1915a SHA-1: 8550b5238836b8178f981e9c720b130901232b51 SHA-256: 6d31382bec103510f8bfa1e272f1166fe49ecfdb9d62941a44044c0c99e8e8a9
140 Risk Score

Malware Insights

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

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open entry, specifically using the RUN function. This strongly suggests the macro is designed to execute arbitrary code upon opening the document. While no specific URLs or payloads were extracted, the technique implies a downloader or initial execution stage for a more complex attack.

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) 6386 bytes
SHA-256: 68ef2bd94622b81317da29c15811466d3ed64a904b7b3e89709738b10d34c552
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 -  qEl
' 0018     22 LABEL : Cell Value, String Constant - AnwMBsi len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F183 
' 0018     22 LABEL : Cell Value, String Constant - awccSVN len=0 
' 0018     22 LABEL : Cell Value, String Constant - cQrbYng len=0 
' 0018     23 LABEL : Cell Value, String Constant - eOQFrLbZ len=0 
' 0018     27 LABEL : Cell Value, String Constant - GZexNNTZGkZQ len=0 
' 0018     23 LABEL : Cell Value, String Constant - jtFVKisH len=0 
' 0018     27 LABEL : Cell Value, String Constant - KlaRlBtpSLPT len=0 
' 0018     27 LABEL : Cell Value, String Constant - lkRVdmedOUaa len=0 
' 0018     20 LABEL : Cell Value, String Constant - mAqtm len=0 
' 0018     24 LABEL : Cell Value, String Constant - noajBGzNu len=0 
' 0018     21 LABEL : Cell Value, String Constant - nQXLzQ len=0 
' 0018     23 LABEL : Cell Value, String Constant - potYkKSU len=0 
' 0018     20 LABEL : Cell Value, String Constant - ujFfC len=0 
' 0018     26 LABEL : Cell Value, String Constant - WAcecriddPM len=0 
' 0018     27 LABEL : Cell Value, String Constant - WjUoNoKWfHNM len=0 
' 0018     22 LABEL : Cell Value, String Constant - XAQyuwv len=0 
' 0018     23 LABEL : Cell Value, String Constant - xeEIucfQ len=0 
' 0018     20 LABEL : Cell Value, String Constant - XnAuU len=0 
' 0018     26 LABEL : Cell Value, String Constant - yHjklLIugpi len=0 
' 0018     26 LABEL : Cell Value, String Constant - ZqBBMarLZnq 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
' 00fd     1
... (truncated)

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