Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8c75fde415d4a157…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:25:32 Authoring application: Microsoft Excel First seen: 2021-06-17
MD5: 3515eb53696a14cfbe2d7cddf80bdd95 SHA-1: 7826fc9f1cc24b8397c9bfa268c8e4f7cc282c2e SHA-256: 8c75fde415d4a1572ac8cfa73c606cc905b727df1b838c0cf41e1dfe9773ee1f
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 defined name, 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 code. This pattern is commonly used to download and execute further malicious 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) 6602 bytes
SHA-256: 6d41ff97597eac6f2e7d216138037b30818fcc3d640ca7dbfaba5cc850f55ee2
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 -  lYSuNNWoKU
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E135 
' 0018     21 LABEL : Cell Value, String Constant - cWmniv len=0 
' 0018     27 LABEL : Cell Value, String Constant - dhvNIliiCqTg len=0 
' 0018     25 LABEL : Cell Value, String Constant - EcEjXjPdEk len=0 
' 0018     26 LABEL : Cell Value, String Constant - eYGKeIVAOzU len=0 
' 0018     22 LABEL : Cell Value, String Constant - GacwizZ len=0 
' 0018     20 LABEL : Cell Value, String Constant - gSmid len=0 
' 0018     21 LABEL : Cell Value, String Constant - hcjelb len=0 
' 0018     25 LABEL : Cell Value, String Constant - kukEwxMOnS len=0 
' 0018     24 LABEL : Cell Value, String Constant - MamduJCzY len=0 
' 0018     20 LABEL : Cell Value, String Constant - RmCbB len=0 
' 0018     25 LABEL : Cell Value, String Constant - sCotUdFukm len=0 
' 0018     20 LABEL : Cell Value, String Constant - uvGXA len=0 
' 0018     27 LABEL : Cell Value, String Constant - UxdkTUOZwRaY len=0 
' 0018     22 LABEL : Cell Value, String Constant - vcDfCOo len=0 
' 0018     27 LABEL : Cell Value, String Constant - VopNOURcEjyY len=0 
' 0018     20 LABEL : Cell Value, String Constant - vQOkp len=0 
' 0018     25 LABEL : Cell Value, String Constant - VxwivkYVaE len=0 
' 0018     22 LABEL : Cell Value, String Constant - wOKVqzi len=0 
' 0018     27 LABEL : Cell Value, String Constant - zjbyZSpEKLrM len=0 
' 0018     24 LABEL : Cell Value, String Constant - ZjKWFDzUX 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)

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