Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 18da20c12988a6d2…

MALICIOUS

Office (OLE) / .XLS

511.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-14
MD5: c6f00a79340f6f74f1bac2fac9f9e5a8 SHA-1: b80d020489bdd3119d35928a98abe2b96c49686a SHA-256: 18da20c12988a6d266300b7a3ad21e2886b6c5c6de7efb67e9ded7393b7dec44
148 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File Execution T1059.005 Visual Basic

The critical heuristic firing for CVE-2017-11882 indicates the exploitation of a known vulnerability within the Equation Editor OLE object. This suggests the primary attack vector is the execution of arbitrary code via this exploit. No VBA macros were found to contain executable statements, but the presence of the Equation Editor exploit is sufficient evidence of malicious intent.

Heuristics 4

  • Equation Editor Ole10Native payload — CVE-2017-11882 critical CVE likely CVE_2017_11882_EQUATION_OLE10NATIVE
    An embedded Microsoft Equation 3.0 object (CLSID 0002CE02-0000-0000-C000-000000000046) carries an Ole10Native packager stream instead of the normal Equation Native/MTEF data. This is the weaponized Equation Editor RCE delivery shape used by CVE-2017-11882 / CVE-2018-0802 maldocs. The payload (font-record overflow + shellcode) is frequently encrypted and the stream name case-scrambled to evade scanners, but an Equation object holding an Ole10Native stream has no benign use.
  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Contains Equation Editor object — related to CVE-2017-11882 / CVE-2018-0802 exploitation, but CLSID presence alone is not the malformed MTEF exploit primitive.
  • x86 GetPC stub (CALL $+5; POP EDX) high SC_GETPC_CALL
    x86 GetPC stub (CALL $+5; POP EDX)
  • VBA project contains no executable statements low OLE_VBA_MACROS
    Document contains a VBA project, but extracted modules only contain attributes/options/comments and no executable statements.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1206 bytes
ole10native_00.bin
6ac9a371f383697a06ca2dd9cd174bd59321e126f7e4780b5594f2679080eba5		 ole-package OLE Ole10Native stream: MBD01523AE0/oLE10nATIVe 1811 bytes

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