Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ce06c78445dad53a…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:39:57 Authoring application: Microsoft Excel First seen: 2021-09-16
MD5: ba5e1a4c199439c97493890a283585a5 SHA-1: 5b6d59ffdc0557f72a174b66816959ee453a203b SHA-256: ce06c78445dad53aae32af47141e2647759509c3437a9eb6516b890feaab448a
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 entry, which is a critical finding indicating automatic execution upon opening. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary commands. While no specific URLs or hashes were extracted, the technique strongly implies the execution of a secondary payload.

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) 6765 bytes
SHA-256: 792a211f5dc7e3987a69988fac8c44a27b121336c2d0908973d2582b2e27aec0
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  nNlfcSLze
' 0018     21 LABEL : Cell Value, String Constant - ATvxTR len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E145 
' 0018     27 LABEL : Cell Value, String Constant - DcStsDQLrOCT len=0 
' 0018     26 LABEL : Cell Value, String Constant - dLzkfxXweht len=0 
' 0018     27 LABEL : Cell Value, String Constant - itDSJeVAOIgx len=0 
' 0018     24 LABEL : Cell Value, String Constant - MnQKiAHiP len=0 
' 0018     20 LABEL : Cell Value, String Constant - OCKXU len=0 
' 0018     21 LABEL : Cell Value, String Constant - oWXSPu len=0 
' 0018     21 LABEL : Cell Value, String Constant - RJeBbT len=0 
' 0018     27 LABEL : Cell Value, String Constant - rSjzeifMtVvU len=0 
' 0018     27 LABEL : Cell Value, String Constant - sbXNbZJaIRoP len=0 
' 0018     20 LABEL : Cell Value, String Constant - stJvv len=0 
' 0018     20 LABEL : Cell Value, String Constant - UFapl len=0 
' 0018     22 LABEL : Cell Value, String Constant - UgUSUSZ len=0 
' 0018     26 LABEL : Cell Value, String Constant - UxEAhOcgivy len=0 
' 0018     22 LABEL : Cell Value, String Constant - vaqgtas len=0 
' 0018     27 LABEL : Cell Value, String Constant - XAemxKLxKNug len=0 
' 0018     22 LABEL : Cell Value, String Constant - xKyFouW len=0 
' 0018     24 LABEL : Cell Value, String Constant - XlqrBsSkp len=0 
' 0018     20 LABEL : Cell Value, String Constant - xZSHQ len=0 
' 0018     21 LABEL : Cell Value, String Constant - ZTpeoq 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     1
... (truncated)

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