Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 aa4069002b7287c7…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:27:49 Authoring application: Microsoft Excel First seen: 2021-10-23
MD5: a822e7ce041ff836a6eb35016dc4c6c4 SHA-1: d2bc3c6fbe5fcc0b32549566b52d52ff0f2057c5 SHA-256: aa4069002b7287c76e361451df2262301be7aa603f0d0ba4a07947b6216071b1
140 Risk Score

Malware Insights

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

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open defined name, which is a known technique for executing malicious code. The macro sheet contains a reference to a dangerous function, likely intended to download and execute a payload. No specific family could be identified, and no direct IOCs were extracted from the macro content itself.

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) 6369 bytes
SHA-256: 359a4a2567adddb8b684332bf4fd71584b3c01001f176c90950dd83932cdd214
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  qwm
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B128 
' 0018     20 LABEL : Cell Value, String Constant - bphxR len=0 
' 0018     22 LABEL : Cell Value, String Constant - DcdQnYs len=0 
' 0018     25 LABEL : Cell Value, String Constant - dTZzcOnnJP len=0 
' 0018     20 LABEL : Cell Value, String Constant - GeZDK len=0 
' 0018     24 LABEL : Cell Value, String Constant - GiOGYYegV len=0 
' 0018     26 LABEL : Cell Value, String Constant - gXoVXVnbOVy len=0 
' 0018     23 LABEL : Cell Value, String Constant - hNUnWwOq len=0 
' 0018     26 LABEL : Cell Value, String Constant - mtiOkVgYghg len=0 
' 0018     22 LABEL : Cell Value, String Constant - PErRyNi len=0 
' 0018     22 LABEL : Cell Value, String Constant - QdFckPz len=0 
' 0018     22 LABEL : Cell Value, String Constant - rkJJIws len=0 
' 0018     26 LABEL : Cell Value, String Constant - SswrlIaRquY len=0 
' 0018     23 LABEL : Cell Value, String Constant - sZrZmNHT len=0 
' 0018     26 LABEL : Cell Value, String Constant - txuzMUUUYJf len=0 
' 0018     20 LABEL : Cell Value, String Constant - WFXAH len=0 
' 0018     22 LABEL : Cell Value, String Constant - WKgmVGE len=0 
' 0018     26 LABEL : Cell Value, String Constant - WMUjJndDNSl len=0 
' 0018     24 LABEL : Cell Value, String Constant - xXHvJfCNn len=0 
' 0018     23 LABEL : Cell Value, String Constant - YoEeMmjC len=0 
' 0018     20 LABEL : Cell Value, String Constant - yZfji 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 LABELSS
... (truncated)

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