Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 cec4a7096842bb64…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:38:42 Authoring application: Microsoft Excel First seen: 2021-07-07
MD5: 758759940346c0145d351612b1c0cd48 SHA-1: 07b0384843af2fc4fa47df59ec2df3f6d632502c SHA-256: cec4a7096842bb64417c026d7948630bdd8029a3a08889407b9c6b02aa580008
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. Static analysis identified critical heuristics related to XLM macros, specifically an Auto_Open defined name and the use of dangerous formula APIs like RUN. This indicates the workbook is designed to automatically execute code upon opening, a common technique for delivering malware. The presence of the 'Auto_Open' label in the extracted macro information is a key indicator of this malicious behavior.

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) 6430 bytes
SHA-256: cdba4666946e1c5616909150167f4bdef391702ec3e67b534a95ff3fcc1df711
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  ACtX
' 0018     24 LABEL : Cell Value, String Constant - AmzygDDTJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A176 
' 0018     27 LABEL : Cell Value, String Constant - cpWhajrsMtss len=0 
' 0018     21 LABEL : Cell Value, String Constant - euTQwu len=0 
' 0018     26 LABEL : Cell Value, String Constant - FPFKLkujhrq len=0 
' 0018     20 LABEL : Cell Value, String Constant - gNHFM len=0 
' 0018     24 LABEL : Cell Value, String Constant - gwjRcShPb len=0 
' 0018     22 LABEL : Cell Value, String Constant - HIGhNYa len=0 
' 0018     23 LABEL : Cell Value, String Constant - hXEAKaNy len=0 
' 0018     25 LABEL : Cell Value, String Constant - jRZgGiIFyH len=0 
' 0018     21 LABEL : Cell Value, String Constant - lrKlBe len=0 
' 0018     23 LABEL : Cell Value, String Constant - MGNDvweK len=0 
' 0018     26 LABEL : Cell Value, String Constant - NkniPkFJupl len=0 
' 0018     27 LABEL : Cell Value, String Constant - prFXXMJgByLs len=0 
' 0018     20 LABEL : Cell Value, String Constant - QGAzz len=0 
' 0018     21 LABEL : Cell Value, String Constant - RBywGP len=0 
' 0018     24 LABEL : Cell Value, String Constant - rqsENMhnp len=0 
' 0018     26 LABEL : Cell Value, String Constant - sMBJtYcDzvd len=0 
' 0018     27 LABEL : Cell Value, String Constant - uebEcRQkirBI len=0 
' 0018     26 LABEL : Cell Value, String Constant - UgOrkhSIKvZ len=0 
' 0018     21 LABEL : Cell Value, String Constant - xaoifu 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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