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

Static analysis result for SHA-256 d144721460c12e62…

MALICIOUS

Office (OLE) / .XLS

560.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-11
MD5: 9fc282ba16661716fee08fd0ff299c89 SHA-1: ed762f587d62803053472d09c919f04e332478d2 SHA-256: d144721460c12e6245c1f1bb33f7d7012408d4de25b99b1d9ac21da642532921
108 Risk Score

Malware Insights

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

The critical heuristic firing indicates the presence of a CVE-2017-11882 Equation Editor exploit. This vulnerability is commonly used to deliver second-stage payloads. Although no VBA macros were found to be executable, the presence of the exploit object strongly suggests an attempt to compromise the user's system.

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: MBD005085C3/Ole10Native 167172 bytes
ole10native_01.bin
9d026a1256d63015f835832ffd6eaa00498e38f166189460b55c888362f143f0		 ole-package OLE Ole10Native stream: MBD005085C5/olE10NatiVe 1501 bytes

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