Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a4a65e54dd4747cb…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:44:08 Authoring application: Microsoft Excel First seen: 2021-06-28
MD5: dc12491f6f5da2eb8157cf1b8c1572e6 SHA-1: 74678843ede590766ad261e24fc1065b897e03e2 SHA-256: a4a65e54dd4747cbf7d87acbf62017850661f145af8f85961f8e31a8cc9fbfc5
140 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro-enabled workbook. Heuristics indicate the presence of an Auto_Open macro, which is a common technique for executing malicious code upon opening the workbook. The macro sheet contains references to dangerous formula APIs, suggesting it is designed to run arbitrary commands.

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) 6752 bytes
SHA-256: b37fd0efbf7f37a99a5f814db868ada67fc3b7604ebd5256f25b7119a9ff459a
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 -  gJFkdKj
' 0018     27 LABEL : Cell Value, String Constant - APvhwuNiaRMz len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I154 
' 0018     26 LABEL : Cell Value, String Constant - blYGoThAjHH len=0 
' 0018     21 LABEL : Cell Value, String Constant - BojlMu len=0 
' 0018     20 LABEL : Cell Value, String Constant - bzysF len=0 
' 0018     21 LABEL : Cell Value, String Constant - cFbTjI len=0 
' 0018     27 LABEL : Cell Value, String Constant - CZiMRksjfuDK len=0 
' 0018     22 LABEL : Cell Value, String Constant - DQsvBdR len=0 
' 0018     23 LABEL : Cell Value, String Constant - DrhYOlQX len=0 
' 0018     24 LABEL : Cell Value, String Constant - fgVrfQFsL len=0 
' 0018     27 LABEL : Cell Value, String Constant - jBGgxddPVXXu len=0 
' 0018     26 LABEL : Cell Value, String Constant - KygTUWcdKOd len=0 
' 0018     22 LABEL : Cell Value, String Constant - OrgWsZE len=0 
' 0018     20 LABEL : Cell Value, String Constant - PsYHW len=0 
' 0018     22 LABEL : Cell Value, String Constant - pZKhUKW len=0 
' 0018     20 LABEL : Cell Value, String Constant - qFAEG len=0 
' 0018     24 LABEL : Cell Value, String Constant - SXuIIJldA len=0 
' 0018     23 LABEL : Cell Value, String Constant - uMstuGnc len=0 
' 0018     21 LABEL : Cell Value, String Constant - vrPCLe len=0 
' 0018     26 LABEL : Cell Value, String Constant - xbrHIzGPadc len=0 
' 0018     20 LABEL : Cell Value, String Constant - ZWxqo 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 LAB
... (truncated)

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