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

Static analysis result for SHA-256 b8006d7703fe630b…

MALICIOUS

Office (OLE) / .XLS

683.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-02-06
MD5: 34a235a65a33f71c8e9d03ee75d05009 SHA-1: 1254a3d373da74f784ce9ebd08f4cc8edf4e514a SHA-256: b8006d7703fe630b0088b25ed8057686d43923cf5d7beb47ce77ea8cb56eeeb5
108 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The critical heuristic firing indicates the presence of a CVE-2017-11882 exploit within an Equation Editor OLE object. The document body presents a seemingly legitimate purchase order, likely intended as a lure. No VBA macros were found to be executable, but the exploit itself is sufficient for payload delivery.

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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
382fc1344a2f0cf6eda18645d41def8d571debc6637bc7fe02a5c83715a51bef		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2112 bytes
ole10native_00.bin
2124d2170af4115abe18ef20c3563f35598e3d96bac7dd8fc268bd46f44fe5f7		 ole-package OLE Ole10Native stream: MBD0108769C/ole10NAtIVe 1402 bytes

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