Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8bf89a4af0a98c0b…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:44:30 Authoring application: Microsoft Excel First seen: 2021-10-07
MD5: 11eb84ea1cdceaf7623ac81d9ccda11d SHA-1: 4d4a4c8d0ee717a037d091d4eeee094e86eabcb0 SHA-256: 8bf89a4af0a98c0b24ca25f852a6a282cb41c93c21eff995fc40e829c18ce9b7
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 containing an Auto_Open defined name, which is a critical indicator of malicious intent. This technique allows the execution of arbitrary commands upon opening the workbook. The presence of dangerous formula APIs like RUN suggests the macro is designed to download and execute a secondary payload, a common tactic for malware delivery.

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) 6579 bytes
SHA-256: 33e91004afed875b0051ca7fcb7604db55c889d1ccedd6e5dbd53d609d2e8345
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 -  MDpzLpwP
' 0018     26 LABEL : Cell Value, String Constant - ANaojkcatPs len=0 
' 0018     27 LABEL : Cell Value, String Constant - aOZWPYzttQcf len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I145 
' 0018     22 LABEL : Cell Value, String Constant - bozYrdt len=0 
' 0018     24 LABEL : Cell Value, String Constant - DxVrERSTI len=0 
' 0018     24 LABEL : Cell Value, String Constant - efSVnfSmS len=0 
' 0018     24 LABEL : Cell Value, String Constant - ewcZWWiXw len=0 
' 0018     21 LABEL : Cell Value, String Constant - gQEtnY len=0 
' 0018     23 LABEL : Cell Value, String Constant - jVnhXVgQ len=0 
' 0018     21 LABEL : Cell Value, String Constant - KeLxsT len=0 
' 0018     25 LABEL : Cell Value, String Constant - KOVazYfNMp len=0 
' 0018     25 LABEL : Cell Value, String Constant - MGvuPPjiqL len=0 
' 0018     26 LABEL : Cell Value, String Constant - PaGfgLcdwQR len=0 
' 0018     25 LABEL : Cell Value, String Constant - pazXeuAnwD len=0 
' 0018     25 LABEL : Cell Value, String Constant - RPOmTrCavf len=0 
' 0018     24 LABEL : Cell Value, String Constant - TEdPfQFFs len=0 
' 0018     25 LABEL : Cell Value, String Constant - UbgyFQSfbE len=0 
' 0018     27 LABEL : Cell Value, String Constant - UiGzWyCKjrXG len=0 
' 0018     21 LABEL : Cell Value, String Constant - YcnADY len=0 
' 0018     22 LABEL : Cell Value, String Constant - zJMKXFs len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZWWhFjfTJJzX 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
... (truncated)

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