Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 56aaf912b64f9e26…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:30:29 Authoring application: Microsoft Excel First seen: 2021-10-23
MD5: e4f5862b9302452fe28dbb3a0085786b SHA-1: 860384fee48f96591dc8a3f40f95b600397cb99d SHA-256: 56aaf912b64f9e2625ab092fbd38e3407199c0471b982fad197f1a5e466c5bb0
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The sample is an Excel file containing Excel 4.0 (XLM) macros, specifically an Auto_Open defined name. This indicates that arbitrary code can be executed when the workbook is opened, which is a common technique for delivering malicious payloads. The presence of dangerous formula APIs further supports this assessment.

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) 6310 bytes
SHA-256: 188bb541976b4ca984f88603527f518bd360868a6525c39def68e77862433885
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  Pwx
' 0018     23 LABEL : Cell Value, String Constant - ADbJktmO len=0 
' 0018     20 LABEL : Cell Value, String Constant - AHuco len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E136 
' 0018     22 LABEL : Cell Value, String Constant - DcjHbPH len=0 
' 0018     21 LABEL : Cell Value, String Constant - frRmuu len=0 
' 0018     22 LABEL : Cell Value, String Constant - GYQtNFJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - irOufYPw len=0 
' 0018     21 LABEL : Cell Value, String Constant - JBYDtK len=0 
' 0018     22 LABEL : Cell Value, String Constant - lgUkvpN len=0 
' 0018     26 LABEL : Cell Value, String Constant - MPYrVGTMFto len=0 
' 0018     22 LABEL : Cell Value, String Constant - pGwoaNy len=0 
' 0018     27 LABEL : Cell Value, String Constant - QLGtmcjlWMSk len=0 
' 0018     26 LABEL : Cell Value, String Constant - suWwxAyZGdC len=0 
' 0018     23 LABEL : Cell Value, String Constant - SxeapqnB len=0 
' 0018     20 LABEL : Cell Value, String Constant - TeULK len=0 
' 0018     26 LABEL : Cell Value, String Constant - twepMonzZWM len=0 
' 0018     21 LABEL : Cell Value, String Constant - VEgYrR len=0 
' 0018     21 LABEL : Cell Value, String Constant - xaHfMN len=0 
' 0018     26 LABEL : Cell Value, String Constant - XnmxapYbRLF len=0 
' 0018     22 LABEL : Cell Value, String Constant - yxzIeKf len=0 
' 0018     20 LABEL : Cell Value, String Constant - ZbKNj 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 : Cell
... (truncated)

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