Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 38d8e6c91662026f…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:40:12 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: 0e807773279440aa5a5f7f032c3bc18f SHA-1: 3be01dcf0252393c72c282a88f1ba264b93aa8e6 SHA-256: 38d8e6c91662026f9ee64ac7e5f2cc2a89f7c4bfb11b694ca6270fc7de66bd07
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 function, which is a known technique for executing malicious code upon opening the workbook. The critical heuristic firings 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 strongly points to a malicious macro loader.

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) 6524 bytes
SHA-256: 3f9a302c4b996e17e9410364eae9408a5c220261e3d179f7adc26aaada80a851
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  QysBrocP
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D162 
' 0018     25 LABEL : Cell Value, String Constant - EHYpalbEuR len=0 
' 0018     20 LABEL : Cell Value, String Constant - flRTI len=0 
' 0018     21 LABEL : Cell Value, String Constant - FvJuli len=0 
' 0018     23 LABEL : Cell Value, String Constant - fVwBzBNx len=0 
' 0018     23 LABEL : Cell Value, String Constant - GXfHewvA len=0 
' 0018     20 LABEL : Cell Value, String Constant - hsouB len=0 
' 0018     21 LABEL : Cell Value, String Constant - HxgboJ len=0 
' 0018     20 LABEL : Cell Value, String Constant - ikMTu len=0 
' 0018     26 LABEL : Cell Value, String Constant - JMjsyWDpZBh len=0 
' 0018     27 LABEL : Cell Value, String Constant - LJughXxVprEN len=0 
' 0018     24 LABEL : Cell Value, String Constant - MOlwBiEby len=0 
' 0018     20 LABEL : Cell Value, String Constant - PDNKn len=0 
' 0018     23 LABEL : Cell Value, String Constant - qQbqimDW len=0 
' 0018     22 LABEL : Cell Value, String Constant - qZIoqBV len=0 
' 0018     25 LABEL : Cell Value, String Constant - rdzWuNsIDo len=0 
' 0018     23 LABEL : Cell Value, String Constant - SqeboIsa len=0 
' 0018     27 LABEL : Cell Value, String Constant - UaMVXSaFYsFd len=0 
' 0018     26 LABEL : Cell Value, String Constant - URQhhEVCrBi len=0 
' 0018     24 LABEL : Cell Value, String Constant - wTHMbzeIa len=0 
' 0018     23 LABEL : Cell Value, String Constant - zdXlpxgG 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 L
... (truncated)

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