Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1adec371eedc694a…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:25:08 Authoring application: Microsoft Excel First seen: 2021-09-25
MD5: 82ec42ef5699414fbbf244a88fb794c7 SHA-1: 601cbd3cc8811685fa8fd86e62fc622155ef6c7a SHA-256: 1adec371eedc694a5451763bb65caa63f3000807a661b6de7dcb1d758af8ac26
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 potential malicious execution. The presence of dangerous formula APIs like RUN further supports this. The macro sheet is designed to execute arbitrary code upon opening, likely serving as a downloader or initial execution vector for a secondary 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) 6430 bytes
SHA-256: 958d3a584b775e03b70a53a5c20c945a18c90f183f7058b19ab5a5ffa71d4793
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  RcWve
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A134 
' 0018     24 LABEL : Cell Value, String Constant - broMtAlVH len=0 
' 0018     23 LABEL : Cell Value, String Constant - equQFier len=0 
' 0018     26 LABEL : Cell Value, String Constant - FhNnnNIeMax len=0 
' 0018     23 LABEL : Cell Value, String Constant - GEONcnWz len=0 
' 0018     24 LABEL : Cell Value, String Constant - jbqlnWubM len=0 
' 0018     25 LABEL : Cell Value, String Constant - kHePyHIUIa len=0 
' 0018     23 LABEL : Cell Value, String Constant - kiOaIsvR len=0 
' 0018     24 LABEL : Cell Value, String Constant - knsVnKPAy len=0 
' 0018     27 LABEL : Cell Value, String Constant - LrnHbwkUjRwt len=0 
' 0018     20 LABEL : Cell Value, String Constant - NHUCS len=0 
' 0018     20 LABEL : Cell Value, String Constant - Njqda len=0 
' 0018     20 LABEL : Cell Value, String Constant - QDSdq len=0 
' 0018     20 LABEL : Cell Value, String Constant - QEZAf len=0 
' 0018     22 LABEL : Cell Value, String Constant - qzAvViO len=0 
' 0018     22 LABEL : Cell Value, String Constant - ukhgykM len=0 
' 0018     27 LABEL : Cell Value, String Constant - vlOMlAgCsXMM len=0 
' 0018     21 LABEL : Cell Value, String Constant - vNCIeK len=0 
' 0018     27 LABEL : Cell Value, String Constant - wtEBCWzJmUJP len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZpQHQauvqGwb len=0 
' 0018     25 LABEL : Cell Value, String Constant - zzmmUGrDju 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     
... (truncated)

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