Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 208e60ef7289ca19…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:47:06 Authoring application: Microsoft Excel First seen: 2021-10-16
MD5: 5f03925789043d170477e89f4a4be180 SHA-1: e1f6791e293c832bb983665f4ee99edef800984a SHA-256: 208e60ef7289ca198e1894e88051b3e909add9ebd62bad791b884f90b6259f05
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. 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, likely to download and execute 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) 6548 bytes
SHA-256: 46dda75992015c8a1be9891687b9207262cc4821ff46025ce7211ea91fb2d684
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  PkoYrBn
' 0018     26 LABEL : Cell Value, String Constant - aBWCLrxKelL len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H185 
' 0018     21 LABEL : Cell Value, String Constant - AWZGcd len=0 
' 0018     24 LABEL : Cell Value, String Constant - BYdVZouMA len=0 
' 0018     24 LABEL : Cell Value, String Constant - CADGnpgsU len=0 
' 0018     25 LABEL : Cell Value, String Constant - ckdviRtYgd len=0 
' 0018     20 LABEL : Cell Value, String Constant - czbjz len=0 
' 0018     23 LABEL : Cell Value, String Constant - FvFqLdCa len=0 
' 0018     20 LABEL : Cell Value, String Constant - gHKdL len=0 
' 0018     27 LABEL : Cell Value, String Constant - GuSDBfDDqVUk len=0 
' 0018     22 LABEL : Cell Value, String Constant - KhhySnJ len=0 
' 0018     24 LABEL : Cell Value, String Constant - LwHvLAWkO len=0 
' 0018     22 LABEL : Cell Value, String Constant - LXAdbiu len=0 
' 0018     27 LABEL : Cell Value, String Constant - NHCrFZzIROCA len=0 
' 0018     22 LABEL : Cell Value, String Constant - qYqWXbk len=0 
' 0018     25 LABEL : Cell Value, String Constant - WhLANMUxlN len=0 
' 0018     26 LABEL : Cell Value, String Constant - WujMezdicMh len=0 
' 0018     24 LABEL : Cell Value, String Constant - XynNoMULI len=0 
' 0018     24 LABEL : Cell Value, String Constant - yiampxLiO len=0 
' 0018     24 LABEL : Cell Value, String Constant - ZaOnuSAHz len=0 
' 0018     26 LABEL : Cell Value, String Constant - zQhnsshMfHG 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
' 0
... (truncated)

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