Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 969d1fb0997086fd…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:24:48 Authoring application: Microsoft Excel First seen: 2021-10-23
MD5: 67585c6f866fa19b0199c77444dbc2bc SHA-1: 5f516f33cf4c85913b05186f9c126b3e211315de SHA-256: 969d1fb0997086fd910aa7f39f1923bf8a66a68e74ec90c51f6f5305efe2734e
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 containing an Auto_Open defined name, which is a critical indicator of malicious intent. This technique is commonly used to execute arbitrary code upon opening the document. The presence of dangerous formula APIs like RUN further supports that the macro is designed to download and execute 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) 6634 bytes
SHA-256: 8f8fca3a68952a80271f60b62aa97a5eb5cd92cd639e88c19e05195a1454c442
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  MMwfmZuZGr
' 0018     25 LABEL : Cell Value, String Constant - acUeajtaFJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C143 
' 0018     26 LABEL : Cell Value, String Constant - bHJDskYfPjL len=0 
' 0018     27 LABEL : Cell Value, String Constant - CYopQmYWgZuB len=0 
' 0018     26 LABEL : Cell Value, String Constant - DLWeerCxbvz len=0 
' 0018     21 LABEL : Cell Value, String Constant - ESsyTO len=0 
' 0018     23 LABEL : Cell Value, String Constant - FxJzGuio len=0 
' 0018     23 LABEL : Cell Value, String Constant - jdROWkir len=0 
' 0018     24 LABEL : Cell Value, String Constant - jWNYyaiZo len=0 
' 0018     21 LABEL : Cell Value, String Constant - KCmAxn len=0 
' 0018     27 LABEL : Cell Value, String Constant - lchxZihnJDHw len=0 
' 0018     25 LABEL : Cell Value, String Constant - LEXwBmmgwM len=0 
' 0018     24 LABEL : Cell Value, String Constant - LQCOrjtoN len=0 
' 0018     23 LABEL : Cell Value, String Constant - QAQqODAI len=0 
' 0018     27 LABEL : Cell Value, String Constant - qrOzjlhEURWy len=0 
' 0018     25 LABEL : Cell Value, String Constant - rHgLaMHvQE len=0 
' 0018     23 LABEL : Cell Value, String Constant - sWNNdJqH len=0 
' 0018     20 LABEL : Cell Value, String Constant - uHsrN len=0 
' 0018     22 LABEL : Cell Value, String Constant - UPrPIHf len=0 
' 0018     23 LABEL : Cell Value, String Constant - XgCKXBbT len=0 
' 0018     21 LABEL : Cell Value, String Constant - YWVYqy 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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