Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7d6dddd3605424e3…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:41:21 Authoring application: Microsoft Excel First seen: 2021-05-23
MD5: 2a5106ceb87236636d6154ef77da6e2f SHA-1: e1b91d9940b59ae309f8968b335dc5c3c376d235 SHA-256: 7d6dddd3605424e3fc8bfd38ecb393389c5d5d03ade7da51bf8dffaea4db69fb
140 Risk Score

Malware Insights

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

The file contains critical heuristic firings indicating the presence of Excel 4.0 macros with an Auto_Open entry point. This suggests the macro is designed to execute automatically upon opening the document. The presence of dangerous formula APIs like RUN further indicates that the macro is intended to execute arbitrary code, likely to download and run a second-stage 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) 6787 bytes
SHA-256: a660b0cf258485a4f9b26d43a61b785530969d24bf4bf44903a5fb304ffe1353
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 -  FRuGLAU
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E197 
' 0018     20 LABEL : Cell Value, String Constant - AUyNq len=0 
' 0018     27 LABEL : Cell Value, String Constant - CIXyLYBdMOeC len=0 
' 0018     26 LABEL : Cell Value, String Constant - EYwESCJjgTS len=0 
' 0018     21 LABEL : Cell Value, String Constant - Fowmda len=0 
' 0018     24 LABEL : Cell Value, String Constant - HjSwfiKkx len=0 
' 0018     20 LABEL : Cell Value, String Constant - lnAHV len=0 
' 0018     21 LABEL : Cell Value, String Constant - nTtnPk len=0 
' 0018     24 LABEL : Cell Value, String Constant - nXvqzSphh len=0 
' 0018     21 LABEL : Cell Value, String Constant - PlXDnO len=0 
' 0018     24 LABEL : Cell Value, String Constant - RApFdUPyS len=0 
' 0018     25 LABEL : Cell Value, String Constant - rglwItNNNw len=0 
' 0018     21 LABEL : Cell Value, String Constant - tpeTbq len=0 
' 0018     20 LABEL : Cell Value, String Constant - tuHOw len=0 
' 0018     25 LABEL : Cell Value, String Constant - uJzFQcStTj len=0 
' 0018     21 LABEL : Cell Value, String Constant - UOBMUQ len=0 
' 0018     20 LABEL : Cell Value, String Constant - VHiwf len=0 
' 0018     23 LABEL : Cell Value, String Constant - XsGSySaI len=0 
' 0018     24 LABEL : Cell Value, String Constant - YRkUDIdyi len=0 
' 0018     24 LABEL : Cell Value, String Constant - yWbtRITcn len=0 
' 0018     23 LABEL : Cell Value, String Constant - zethRSTh 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 LABELSST : 
... (truncated)

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