Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1e7a56a0b42c9291…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-27 11:37:36 Authoring application: Microsoft Excel First seen: 2021-11-02
MD5: 3cde0388833b8626e693dc0a22621daf SHA-1: 6c2d7a5fedcd73363405c0678ae4a04e8e7ca302 SHA-256: 1e7a56a0b42c92914db39126472df0e078e26cc6c73a6977a80425a4a2cca565
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 macro that utilizes dangerous functions. This indicates an attempt to execute arbitrary code upon opening the document. The presence of the Auto_Open function and the use of risky formula APIs strongly suggest the macro is designed to download and execute a secondary payload, a common technique 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) 6791 bytes
SHA-256: 364e89b6bd0b28650ddf82398cdb80e3b1c6e3efa7732360968158ce44397eb7
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  nyXmDPMGYQ
' 0018     22 LABEL : Cell Value, String Constant - AASavTQ len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H163 
' 0018     22 LABEL : Cell Value, String Constant - BSaZFIx len=0 
' 0018     21 LABEL : Cell Value, String Constant - BXhBKW len=0 
' 0018     21 LABEL : Cell Value, String Constant - cVTOor len=0 
' 0018     22 LABEL : Cell Value, String Constant - CZiXpHl len=0 
' 0018     24 LABEL : Cell Value, String Constant - dDtulQDVy len=0 
' 0018     22 LABEL : Cell Value, String Constant - DwedNuc len=0 
' 0018     21 LABEL : Cell Value, String Constant - eUzHwK len=0 
' 0018     22 LABEL : Cell Value, String Constant - HMxycFG len=0 
' 0018     20 LABEL : Cell Value, String Constant - JRjab len=0 
' 0018     22 LABEL : Cell Value, String Constant - lgOWvWu len=0 
' 0018     25 LABEL : Cell Value, String Constant - lHZpMXgZNV len=0 
' 0018     26 LABEL : Cell Value, String Constant - nubDgQFPsQj len=0 
' 0018     23 LABEL : Cell Value, String Constant - okvecrYP len=0 
' 0018     25 LABEL : Cell Value, String Constant - OLNwQRBHDr len=0 
' 0018     25 LABEL : Cell Value, String Constant - OsmAwAlDGN len=0 
' 0018     23 LABEL : Cell Value, String Constant - PNmSCMIj len=0 
' 0018     24 LABEL : Cell Value, String Constant - tQNqFQsqz len=0 
' 0018     20 LABEL : Cell Value, String Constant - Uomet len=0 
' 0018     24 LABEL : Cell Value, String Constant - XLMyrgnkd 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
... (truncated)

Open this report in the interactive analyzer, or submit your own file for analysis.