Office (OLE) / .XLSX malware analysis — malicious · cf6a40a3c130a0f7

MALICIOUS

Office (OLE) / .XLSX

151.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-10-27

MD5: 8dfc3e65790a2dc73aa2422e55c08c7f SHA-1: bb87036bd5a18a45d0256d5fa7ffe1db0635519c SHA-256: cf6a40a3c130a0f7228c1b3e8ad64f3af5a74ca096b91566016c7131dfd1f19d

140 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The critical heuristic firing for CVE-2017_11882_EQUATION_OLE10NATIVE indicates the exploitation of a known vulnerability in Microsoft Equation Editor. This is further supported by the OLE_EQUATION_EDITOR heuristic. The presence of an ole10NAtiVE embedded artifact confirms the payload delivery mechanism.

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.
x86 GetPC stub (CALL $+5; POP ECX) high SC_GETPC_CALL

x86 GetPC stub (CALL $+5; POP ECX)

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`ole10native_00.bin` `b947933ba1951bc68f4d5c206f637379eb40614cbf3c250e75bb6894398640a9`	ole-package	OLE Ole10Native stream: MBD01720FBD/ole10NAtiVE	1676 bytes

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