Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 fe1825b17aa4f1ad…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:39:13 Authoring application: Microsoft Excel First seen: 2021-07-10
MD5: 64865e3f6affdfefc4019a2c3ef84bbd SHA-1: 9771373cb780cae5735886bcaeabefeb446dc56c SHA-256: fe1825b17aa4f1adff1f95f63eeb386617a498fa4e428fa718246cc637c7fb16
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 critical finding. This indicates the macro sheet is designed to automatically execute code upon opening. The presence of dangerous formula APIs like RUN further confirms the intent to execute arbitrary commands, likely leading to the download and execution of a secondary 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) 6369 bytes
SHA-256: 277086eab78a80ef2fec0f53ad0bd278c50c3e6832c4d05bfaa800aba6d34808
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 -  yAG
' 0018     21 LABEL : Cell Value, String Constant - ABzNXR len=0 
' 0018     21 LABEL : Cell Value, String Constant - aujsAp len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C141 
' 0018     24 LABEL : Cell Value, String Constant - cBEZlLOBN len=0 
' 0018     20 LABEL : Cell Value, String Constant - DlBdw len=0 
' 0018     22 LABEL : Cell Value, String Constant - dLbibGO len=0 
' 0018     24 LABEL : Cell Value, String Constant - DruQcJsww len=0 
' 0018     26 LABEL : Cell Value, String Constant - eTUqsTVPNEf len=0 
' 0018     26 LABEL : Cell Value, String Constant - grqQbTdCNFB len=0 
' 0018     22 LABEL : Cell Value, String Constant - HSmNmOu len=0 
' 0018     24 LABEL : Cell Value, String Constant - JpgieAPSa len=0 
' 0018     21 LABEL : Cell Value, String Constant - jPSwlj len=0 
' 0018     26 LABEL : Cell Value, String Constant - jXrgqlDeEbD len=0 
' 0018     26 LABEL : Cell Value, String Constant - mMNviqDmIrG len=0 
' 0018     24 LABEL : Cell Value, String Constant - nTcdhHzob len=0 
' 0018     26 LABEL : Cell Value, String Constant - OBJjtaWucZS len=0 
' 0018     20 LABEL : Cell Value, String Constant - QbQmD len=0 
' 0018     22 LABEL : Cell Value, String Constant - WAXHxNo len=0 
' 0018     25 LABEL : Cell Value, String Constant - wPXlQZOxVy len=0 
' 0018     20 LABEL : Cell Value, String Constant - xTEEW len=0 
' 0018     23 LABEL : Cell Value, String Constant - zaBJcuwP 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 LABELS
... (truncated)

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