Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 304adbdc244ed003…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:34:30 Authoring application: Microsoft Excel First seen: 2021-07-07
MD5: 02ba589e70d979a40f49c2792f098e50 SHA-1: 751afc89cb29b57f95f5250153370b88b6b65002 SHA-256: 304adbdc244ed003f17cc7770549ea9e477bae497cdce461ef0c12e993394dd0
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 critical finding indicating potential malicious execution. The presence of dangerous formula APIs like RUN further supports this. The macro sheet is designed to execute arbitrary code upon opening, 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) 6589 bytes
SHA-256: cb32da37826942ba8dc21989826a78945f0630b397b67f9ac86d4678da259d84
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 -  WdNTcheX
' 0018     21 LABEL : Cell Value, String Constant - AACbmv len=0 
' 0018     22 LABEL : Cell Value, String Constant - aOhVwqW len=0 
' 0018     23 LABEL : Cell Value, String Constant - AUpqZmcb len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B187 
' 0018     23 LABEL : Cell Value, String Constant - AxiAVkcH len=0 
' 0018     27 LABEL : Cell Value, String Constant - BGZrAmVTHPOJ len=0 
' 0018     24 LABEL : Cell Value, String Constant - bQGeZOFnT len=0 
' 0018     27 LABEL : Cell Value, String Constant - FNmHSMFYqvKO len=0 
' 0018     21 LABEL : Cell Value, String Constant - jdHkQl len=0 
' 0018     25 LABEL : Cell Value, String Constant - JJSzjslvTM len=0 
' 0018     25 LABEL : Cell Value, String Constant - KYNkNaYrTK len=0 
' 0018     22 LABEL : Cell Value, String Constant - MSVFnZp len=0 
' 0018     21 LABEL : Cell Value, String Constant - obIwOH len=0 
' 0018     21 LABEL : Cell Value, String Constant - PjkLEi len=0 
' 0018     20 LABEL : Cell Value, String Constant - qdtVK len=0 
' 0018     27 LABEL : Cell Value, String Constant - QNcKUDwcmFXs len=0 
' 0018     21 LABEL : Cell Value, String Constant - qyHyOL len=0 
' 0018     23 LABEL : Cell Value, String Constant - RXlGcJgv len=0 
' 0018     27 LABEL : Cell Value, String Constant - sqUcpinjHIRm len=0 
' 0018     25 LABEL : Cell Value, String Constant - UYdstwoFLk len=0 
' 0018     22 LABEL : Cell Value, String Constant - WqTbUjg 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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