Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5da6495c9dfc581b…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:44:35 Authoring application: Microsoft Excel First seen: 2021-06-28
MD5: 53e3823c36b192e1a722260003a2d332 SHA-1: da30b55dc5b83adba7aa0d2bde0733b5dc31fe1a SHA-256: 5da6495c9dfc581b1d4536456fda2eb12eabd46de7a49f6ebd1e686119eaa4b7
140 Risk Score

Malware Insights

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

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open defined name, which is a known technique for executing malicious code. The `RUN=0` formula API suggests the macro is designed to execute external commands or download payloads. While no specific URLs or hashes were extracted, the presence of Auto_Open strongly implies a downloader or initial execution stage.

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) 6702 bytes
SHA-256: 6e135c45333e864f48d6a837db4abc184a6fec25fbb4dba0aeb749b152dfcf35
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  OLCArxlaSeE
' 0018     27 LABEL : Cell Value, String Constant - adnORBTCkOwS len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D155 
' 0018     24 LABEL : Cell Value, String Constant - cKbjMaPeD len=0 
' 0018     22 LABEL : Cell Value, String Constant - cvrMmpX len=0 
' 0018     21 LABEL : Cell Value, String Constant - DJvejG len=0 
' 0018     23 LABEL : Cell Value, String Constant - fNZmDbNP len=0 
' 0018     24 LABEL : Cell Value, String Constant - gyJDnhznW len=0 
' 0018     25 LABEL : Cell Value, String Constant - gZbCLNLCQJ len=0 
' 0018     22 LABEL : Cell Value, String Constant - hmdhKJt len=0 
' 0018     22 LABEL : Cell Value, String Constant - McUlNYd len=0 
' 0018     26 LABEL : Cell Value, String Constant - miJHNjSriuk len=0 
' 0018     24 LABEL : Cell Value, String Constant - myJBBsXqP len=0 
' 0018     24 LABEL : Cell Value, String Constant - mZKnXdLvr len=0 
' 0018     21 LABEL : Cell Value, String Constant - nlgSuL len=0 
' 0018     24 LABEL : Cell Value, String Constant - nwPtpopKi len=0 
' 0018     23 LABEL : Cell Value, String Constant - PSxtICfV len=0 
' 0018     20 LABEL : Cell Value, String Constant - qjksZ len=0 
' 0018     25 LABEL : Cell Value, String Constant - qjXsXDUeDf len=0 
' 0018     23 LABEL : Cell Value, String Constant - tXxOqsGH len=0 
' 0018     21 LABEL : Cell Value, String Constant - uBwPPx len=0 
' 0018     27 LABEL : Cell Value, String Constant - vqLPQHUxRclY 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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