Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7227c212f4db9943…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:39:12 Authoring application: Microsoft Excel First seen: 2021-10-14
MD5: dcd3cb2dcefaea48989dff87c3ded60e SHA-1: 85866b517ff73001b5e9ad157058f8c4f3417658 SHA-256: 7227c212f4db9943a46c1e7a48f86b80073f3290bd0eb311cd9ce6ef110e2ddd
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. Heuristics indicate the presence of an Auto_Open macro and the use of dangerous formula APIs, specifically the RUN function. This suggests the macro is designed to execute arbitrary code, likely a downloader for a second-stage payload, upon opening the workbook.

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) 6502 bytes
SHA-256: e4381e5fb92897fdab8915cc142ea9d6936f2dbe582f07ff7294c9f41164e02f
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 -  ypsRSzb
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A149 
' 0018     21 LABEL : Cell Value, String Constant - AxiHhl len=0 
' 0018     20 LABEL : Cell Value, String Constant - bJrYu len=0 
' 0018     26 LABEL : Cell Value, String Constant - EfArsNvzDCY len=0 
' 0018     20 LABEL : Cell Value, String Constant - hOTpn len=0 
' 0018     23 LABEL : Cell Value, String Constant - HZEdJsBV len=0 
' 0018     24 LABEL : Cell Value, String Constant - jWUQZPKUO len=0 
' 0018     27 LABEL : Cell Value, String Constant - KbtcpiiNdQHv len=0 
' 0018     23 LABEL : Cell Value, String Constant - lBvImGOu len=0 
' 0018     25 LABEL : Cell Value, String Constant - LmuMTpFwod len=0 
' 0018     25 LABEL : Cell Value, String Constant - qvaOtasRPM len=0 
' 0018     27 LABEL : Cell Value, String Constant - rIsNYuqGYhpX len=0 
' 0018     22 LABEL : Cell Value, String Constant - RsYBvUk len=0 
' 0018     20 LABEL : Cell Value, String Constant - ScCfZ len=0 
' 0018     20 LABEL : Cell Value, String Constant - uFUpI len=0 
' 0018     24 LABEL : Cell Value, String Constant - UsbcAHcHm len=0 
' 0018     21 LABEL : Cell Value, String Constant - WbQQMP len=0 
' 0018     27 LABEL : Cell Value, String Constant - WgIQEXtJiNmD len=0 
' 0018     27 LABEL : Cell Value, String Constant - wzmdckJwlPLn len=0 
' 0018     25 LABEL : Cell Value, String Constant - ysiSTvsVSV len=0 
' 0018     22 LABEL : Cell Value, String Constant - ZpPFFil 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    
... (truncated)

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