Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e7a1dd2bbb542e06…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:35:03 Authoring application: Microsoft Excel First seen: 2021-07-02
MD5: 64626d0038adc18eb4bfb3db76d893e8 SHA-1: 6860d9e07db181aa76a79a82977371bcae5b92e5 SHA-256: e7a1dd2bbb542e062c949a457f9ae4051b1c4cc3e7d15c4af83ad0c2c55080a9
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 (XLM) macros, specifically an Auto_Open defined name, which is a critical indicator of malicious intent. This technique allows for the execution of arbitrary code 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 distribution.

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) 6405 bytes
SHA-256: be5dae2651ad87222e53b7b36fea1aa29168cfc69f872efd5370bceb882ece5f
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 -  lrb
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B190 
' 0018     21 LABEL : Cell Value, String Constant - cTNXXS len=0 
' 0018     23 LABEL : Cell Value, String Constant - DnLCDtJK len=0 
' 0018     25 LABEL : Cell Value, String Constant - EWalrHHIkh len=0 
' 0018     20 LABEL : Cell Value, String Constant - fspwM len=0 
' 0018     21 LABEL : Cell Value, String Constant - GXOtYJ len=0 
' 0018     21 LABEL : Cell Value, String Constant - HPWdYR len=0 
' 0018     23 LABEL : Cell Value, String Constant - HZCsJAZt len=0 
' 0018     21 LABEL : Cell Value, String Constant - KHDxoh len=0 
' 0018     21 LABEL : Cell Value, String Constant - kMxuqg len=0 
' 0018     21 LABEL : Cell Value, String Constant - lOQSbO len=0 
' 0018     21 LABEL : Cell Value, String Constant - mKoneh len=0 
' 0018     24 LABEL : Cell Value, String Constant - nJQusbZIR len=0 
' 0018     21 LABEL : Cell Value, String Constant - NMumzR len=0 
' 0018     25 LABEL : Cell Value, String Constant - trVotSwAaB len=0 
' 0018     20 LABEL : Cell Value, String Constant - UIGZl len=0 
' 0018     26 LABEL : Cell Value, String Constant - yfLLTsChLDg len=0 
' 0018     20 LABEL : Cell Value, String Constant - yUkmv len=0 
' 0018     22 LABEL : Cell Value, String Constant - YWpXijD len=0 
' 0018     21 LABEL : Cell Value, String Constant - zTOjlL len=0 
' 0018     22 LABEL : Cell Value, String Constant - ZzVNnpC 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 : Cell Value, String 
... (truncated)

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