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

Static analysis result for SHA-256 63f0ffc0f10bb725…

MALICIOUS

Office (OLE) / .XLS

560.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-11
MD5: 9e998ce9617dd910cc9eaa222e4cfb0b SHA-1: e074f3d67a923578e9bf2d0cf22158c79c2e6d65 SHA-256: 63f0ffc0f10bb725b00dd808ad1c8c1c59502b4769d92e76ddc678e5df0ddd4a
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates the exploitation of a known vulnerability in the Equation Editor. The presence of an OLE object containing a payload further supports this. While no VBA macros were found to be executable, the exploit itself is sufficient for initial compromise.

Heuristics 3

  • 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.
  • 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 3

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
aebfa3cc9cffd1af88424a4828f90c2a91932c7006bd1640e9ae65f18d99a7e2		 ole-package OLE Ole10Native stream: MBD004F281E/Ole10Native 167172 bytes
ole10native_01.bin
211274b1b038e5fcf00d530fdbf5deaec9af2105d94cb765a83ecde8ca5933f6		 ole-package OLE Ole10Native stream: MBD004F2820/OlE10nAtiVe 1348 bytes

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