Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d2f4f3ac3cbd422b…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:41:51 Authoring application: Microsoft Excel First seen: 2021-07-02
MD5: 03dfd78862cd76da8974fa7f16d079f6 SHA-1: 44e6edf9f3ee25f6931e1e6ca4c0b8f5e9b9fef9 SHA-256: d2f4f3ac3cbd422b17e0ff6587aec430d62179e5c704c7f8972268e12955dae3
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The file is an Excel 4.0 macro sheet that contains an Auto_Open defined name, indicating that it is designed to execute automatically upon opening. The presence of dangerous formula APIs like RUN suggests it is intended to run arbitrary commands. While the specific commands are not fully visible due to truncation, the Auto_Open entry is a high-priority indicator of malicious intent.

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) 6475 bytes
SHA-256: 0b6290b8fc96fa885a3f3971690b0e6f71d145945e93141743741a98c4d7d41d
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  yrAbrrvB
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I148 
' 0018     21 LABEL : Cell Value, String Constant - durGXp len=0 
' 0018     21 LABEL : Cell Value, String Constant - dZLhwT len=0 
' 0018     22 LABEL : Cell Value, String Constant - eSrxkzX len=0 
' 0018     23 LABEL : Cell Value, String Constant - GINJImyo len=0 
' 0018     22 LABEL : Cell Value, String Constant - GWwWvot len=0 
' 0018     22 LABEL : Cell Value, String Constant - htUuJmd len=0 
' 0018     24 LABEL : Cell Value, String Constant - INJDJPaxh len=0 
' 0018     20 LABEL : Cell Value, String Constant - iZSZS len=0 
' 0018     25 LABEL : Cell Value, String Constant - JiFSTxBAMk len=0 
' 0018     20 LABEL : Cell Value, String Constant - kVpXs len=0 
' 0018     21 LABEL : Cell Value, String Constant - LayhYj len=0 
' 0018     24 LABEL : Cell Value, String Constant - onZFPKVWC len=0 
' 0018     25 LABEL : Cell Value, String Constant - pAbDEZLpWd len=0 
' 0018     25 LABEL : Cell Value, String Constant - TEsZeHJNfJ len=0 
' 0018     21 LABEL : Cell Value, String Constant - vIpMNL len=0 
' 0018     24 LABEL : Cell Value, String Constant - VngMWuFQM len=0 
' 0018     27 LABEL : Cell Value, String Constant - VOEWiiMBxieH len=0 
' 0018     21 LABEL : Cell Value, String Constant - YdLbri len=0 
' 0018     23 LABEL : Cell Value, String Constant - YXwKhOav len=0 
' 0018     20 LABEL : Cell Value, String Constant - ZzZul 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     10 LABELSST : Ce
... (truncated)

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