Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e0f9964e019f7cd1…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:41:19 Authoring application: Microsoft Excel First seen: 2021-09-16
MD5: 0807234b1a9da36fc48f82c49c78ee53 SHA-1: 42430b7f31ce93be620ccaa98d5276e41d03c208 SHA-256: e0f9964e019f7cd1f05d80f0f5b21381e174922db38fd2c7b38e9b1030855b21
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 (XLM) macros, specifically an Auto_Open function, which is a critical finding. This indicates the file is designed to automatically execute malicious code upon opening. The presence of dangerous formula APIs like RUN further confirms its malicious intent. No specific family could be identified, but the technique is common for initial execution.

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) 6534 bytes
SHA-256: ec103b124585254e8019128eb1ded88747ad80c2c1b3d556f08c9a65580a861a
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 -  EeDgVPvu
' 0018     27 LABEL : Cell Value, String Constant - AUKvekGdVnEj len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D195 
' 0018     20 LABEL : Cell Value, String Constant - BcuxC len=0 
' 0018     22 LABEL : Cell Value, String Constant - cxzFNyT len=0 
' 0018     20 LABEL : Cell Value, String Constant - Efkor len=0 
' 0018     22 LABEL : Cell Value, String Constant - eLwHhLy len=0 
' 0018     20 LABEL : Cell Value, String Constant - GioWe len=0 
' 0018     24 LABEL : Cell Value, String Constant - IehXUPwEQ len=0 
' 0018     25 LABEL : Cell Value, String Constant - JwVEYkjOle len=0 
' 0018     22 LABEL : Cell Value, String Constant - lxCTugH len=0 
' 0018     21 LABEL : Cell Value, String Constant - mFGzNf len=0 
' 0018     25 LABEL : Cell Value, String Constant - RsZdGzDNXS len=0 
' 0018     21 LABEL : Cell Value, String Constant - seQVrf len=0 
' 0018     26 LABEL : Cell Value, String Constant - uVxQAcbvySo len=0 
' 0018     22 LABEL : Cell Value, String Constant - wnFfYiT len=0 
' 0018     26 LABEL : Cell Value, String Constant - WVbbaJoGXhE len=0 
' 0018     26 LABEL : Cell Value, String Constant - xByRhnsdqUb len=0 
' 0018     20 LABEL : Cell Value, String Constant - xDpDK len=0 
' 0018     25 LABEL : Cell Value, String Constant - xgqNFLEYHm len=0 
' 0018     25 LABEL : Cell Value, String Constant - YMblERzThd len=0 
' 0018     25 LABEL : Cell Value, String Constant - zcmCVQcFbw 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 
... (truncated)

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