Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d22982320cd921a9…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:41:19 Authoring application: Microsoft Excel First seen: 2021-09-25
MD5: 41cc9b131e31ea548d6764d2290fddcd SHA-1: b7f2e7e9cd0f1892d9a1b3a0b3d2881a29d97c6e SHA-256: d22982320cd921a97856631e3605ca6b4d9654367489695580539d2e6042b31a
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 known method for executing malicious code upon opening the workbook. The critical heuristics indicate the presence of dangerous formula APIs within the Auto_Open macro, suggesting it is designed to run arbitrary commands. No specific family could be identified, but the technique is consistent with macro-based malware delivery.

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) 6691 bytes
SHA-256: 4172671349dd332635c7f655985e2d7a3a2ab9f4c2cda305cb7506f4f01dda16
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  jRgtrT
' 0018     26 LABEL : Cell Value, String Constant - AJZTsjTsmSX len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I163 
' 0018     27 LABEL : Cell Value, String Constant - bGoaETWOmkZx len=0 
' 0018     24 LABEL : Cell Value, String Constant - bReZQqLxU len=0 
' 0018     20 LABEL : Cell Value, String Constant - CHgTo len=0 
' 0018     20 LABEL : Cell Value, String Constant - Cqbma len=0 
' 0018     23 LABEL : Cell Value, String Constant - DtJzlGbH len=0 
' 0018     23 LABEL : Cell Value, String Constant - giUFFsGx len=0 
' 0018     27 LABEL : Cell Value, String Constant - ITgnowzZnlzW len=0 
' 0018     20 LABEL : Cell Value, String Constant - JhWIG len=0 
' 0018     22 LABEL : Cell Value, String Constant - LyfFAMA len=0 
' 0018     27 LABEL : Cell Value, String Constant - nBqfcmNKGgtK len=0 
' 0018     26 LABEL : Cell Value, String Constant - QnEiJgNKTcW len=0 
' 0018     24 LABEL : Cell Value, String Constant - rglDAeCiD len=0 
' 0018     20 LABEL : Cell Value, String Constant - SGjkl len=0 
' 0018     26 LABEL : Cell Value, String Constant - TPOOcYUkZpS len=0 
' 0018     25 LABEL : Cell Value, String Constant - ttsKjuTIuc len=0 
' 0018     25 LABEL : Cell Value, String Constant - vBSFRmgIGD len=0 
' 0018     25 LABEL : Cell Value, String Constant - VFCWtneWfg len=0 
' 0018     23 LABEL : Cell Value, String Constant - yLWeuGdl len=0 
' 0018     26 LABEL : Cell Value, String Constant - zxTqLiuakIh 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
'
... (truncated)

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