Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 396d1c9e653e7f4a…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:46:20 Authoring application: Microsoft Excel First seen: 2021-07-07
MD5: 2089e517d758ef74a639cc3541763ea9 SHA-1: ab6a89b9dbf2ce03a42396e9993c800c58547124 SHA-256: 396d1c9e653e7f4af696c9bd4ea61898d24858b3d30f84edf98646e23fcaee12
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 macro. This macro is designed to execute automatically when the workbook is opened, indicating a malicious intent to run arbitrary code. The presence of dangerous formula APIs like RUN suggests it's used to launch external processes or download payloads.

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) 6449 bytes
SHA-256: f64d6fcf71ebc054c2ee75bfb2865634ff977499652636505339043eb636d2f8
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 -  UJrB
' 0018     20 LABEL : Cell Value, String Constant - aaukF len=0 
' 0018     23 LABEL : Cell Value, String Constant - akVtRrub len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D184 
' 0018     26 LABEL : Cell Value, String Constant - gLWVqzBVPaw len=0 
' 0018     24 LABEL : Cell Value, String Constant - HXfbYdfaU len=0 
' 0018     25 LABEL : Cell Value, String Constant - kAXrECfUAE len=0 
' 0018     20 LABEL : Cell Value, String Constant - KEZHV len=0 
' 0018     25 LABEL : Cell Value, String Constant - LOnnFMyaNa len=0 
' 0018     27 LABEL : Cell Value, String Constant - MUkaOZDSAKbI len=0 
' 0018     20 LABEL : Cell Value, String Constant - mUUlR len=0 
' 0018     24 LABEL : Cell Value, String Constant - nevsTiSrK len=0 
' 0018     24 LABEL : Cell Value, String Constant - PtaHVdaJa len=0 
' 0018     21 LABEL : Cell Value, String Constant - QmEKFn len=0 
' 0018     27 LABEL : Cell Value, String Constant - qPeUEdsjLcoZ len=0 
' 0018     27 LABEL : Cell Value, String Constant - rdIXyxBEZhAr len=0 
' 0018     24 LABEL : Cell Value, String Constant - RmiMtylVz len=0 
' 0018     26 LABEL : Cell Value, String Constant - SgWPCTlveAA len=0 
' 0018     26 LABEL : Cell Value, String Constant - tXoayBExqev len=0 
' 0018     25 LABEL : Cell Value, String Constant - xKrucGFFQW len=0 
' 0018     20 LABEL : Cell Value, String Constant - YdCAF len=0 
' 0018     25 LABEL : Cell Value, String Constant - YioAqLvghV 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
' 0
... (truncated)

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