Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 301ab77f5c47dc63…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:41:00 Authoring application: Microsoft Excel First seen: 2021-10-02
MD5: 1a86f2153b98d552d94f26d70f170436 SHA-1: ce6e592f172908d3a4bc6f921dd34b335f2d6fc7 SHA-256: 301ab77f5c47dc635ebf315412c2400efe77fbf4874be0f044605600933560d4
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 technique for executing malicious code upon opening the workbook. The presence of dangerous formula APIs like RUN indicates an intent to execute arbitrary commands. Without further deobfuscation or network activity, the exact payload and family remain unknown.

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) 6526 bytes
SHA-256: 96a5a73cba725c835c9cc27dc36c04ac3dbf34b06d62e2e763f18a4d9f547388
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 -  jDb
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A182 
' 0018     21 LABEL : Cell Value, String Constant - bGiVrL len=0 
' 0018     26 LABEL : Cell Value, String Constant - EAQIdbbWjJf len=0 
' 0018     25 LABEL : Cell Value, String Constant - emmGzuoENq len=0 
' 0018     26 LABEL : Cell Value, String Constant - ewHDtfgmKTz len=0 
' 0018     23 LABEL : Cell Value, String Constant - fOqvZViJ len=0 
' 0018     25 LABEL : Cell Value, String Constant - FuIpXmXuaa len=0 
' 0018     22 LABEL : Cell Value, String Constant - FVOiqkm len=0 
' 0018     26 LABEL : Cell Value, String Constant - gdufcDKMLht len=0 
' 0018     23 LABEL : Cell Value, String Constant - gzwaZKyG len=0 
' 0018     25 LABEL : Cell Value, String Constant - HUHFQPmiLW len=0 
' 0018     21 LABEL : Cell Value, String Constant - IPzYNC len=0 
' 0018     20 LABEL : Cell Value, String Constant - JvaVr len=0 
' 0018     20 LABEL : Cell Value, String Constant - JXmxZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - MviPDcng len=0 
' 0018     27 LABEL : Cell Value, String Constant - PvevXBYJAZUS len=0 
' 0018     20 LABEL : Cell Value, String Constant - RDWYn len=0 
' 0018     21 LABEL : Cell Value, String Constant - tJcumL len=0 
' 0018     24 LABEL : Cell Value, String Constant - TyFXVtAsu len=0 
' 0018     21 LABEL : Cell Value, String Constant - ygCreb len=0 
' 0018     23 LABEL : Cell Value, String Constant - ySBHCvMK 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)

Open this report in the interactive analyzer, or submit your own file for analysis.