Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 972fd61d1cedb008…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:41:36 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 04518777e1e69094e3bbb8e3ddc49a6a SHA-1: 0f2e42c2b0854d09f15a7a79431e990d5a2ddc95 SHA-256: 972fd61d1cedb008b0f091b17ae3fdfe901b7d2080d1a5b3f94947729f682657
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. Heuristics indicate the presence of an Auto_Open macro, which is a common technique for executing malicious code upon opening the workbook. The macro sheet contains formulas that call dangerous functions, suggesting it is designed to download and execute a second-stage 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) 6860 bytes
SHA-256: d75a8409bd1670fe385c6cb8d220dcd3e44811ffd06c2831a9a62287f61795c1
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 -  SiUPXeUxTO
' 0018     22 LABEL : Cell Value, String Constant - aszjISe len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D157 
' 0018     25 LABEL : Cell Value, String Constant - dddplAjKPo len=0 
' 0018     26 LABEL : Cell Value, String Constant - DxtxXVrsEAg len=0 
' 0018     25 LABEL : Cell Value, String Constant - ERtEQtldxE len=0 
' 0018     24 LABEL : Cell Value, String Constant - FqXVTCKRd len=0 
' 0018     27 LABEL : Cell Value, String Constant - fVYRycKJkfAH len=0 
' 0018     21 LABEL : Cell Value, String Constant - Fymrqt len=0 
' 0018     24 LABEL : Cell Value, String Constant - iNFRXYFXP len=0 
' 0018     21 LABEL : Cell Value, String Constant - iRKjVU len=0 
' 0018     27 LABEL : Cell Value, String Constant - jKFnzXGturUq len=0 
' 0018     25 LABEL : Cell Value, String Constant - JrgxIvMmmD len=0 
' 0018     23 LABEL : Cell Value, String Constant - KXqrtwaM len=0 
' 0018     21 LABEL : Cell Value, String Constant - lRausz len=0 
' 0018     22 LABEL : Cell Value, String Constant - mkIGFkA len=0 
' 0018     27 LABEL : Cell Value, String Constant - NcfVKPXidjlk len=0 
' 0018     22 LABEL : Cell Value, String Constant - RdjyxVA len=0 
' 0018     27 LABEL : Cell Value, String Constant - TgbmnKngbEqp len=0 
' 0018     25 LABEL : Cell Value, String Constant - vPBcygpEJT len=0 
' 0018     26 LABEL : Cell Value, String Constant - xwoooaICPYW len=0 
' 0018     21 LABEL : Cell Value, String Constant - YhwKFc 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/
... (truncated)

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