Office (OLE) / .XLS malware analysis — malicious · e33b39bcd0152d65

MALICIOUS

Office (OLE) / .XLS

728.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-11

MD5: 86d4ef6bde5d062f43bc094495c11283 SHA-1: 77d970f36d32a8f747716c1e45b4d5477ff40c05 SHA-256: e33b39bcd0152d65877e6ba926fa94b3db3b649e7337c16ca57096cfe7a64f1a

148 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious File T1059.005 Visual Basic

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates the exploitation of a known vulnerability in Microsoft Equation Editor. This technique is commonly used to deliver secondary payloads. No VBA macros were found to contain executable statements, and no document body was available for analysis, 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 EBX) high SC_GETPC_CALL

x86 GetPC stub (CALL $+5; POP EBX)
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.

Filename	Kind	Source	Size
`macros.bas` `1d3b71b8c6234aace88f31f6e674b07383e015a2e68993dcd4fc2526aa470fe5`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	2412 bytes
`ole10native_00.bin` `60764ddfbf08221ec49dcbd57324c76564d2451a4e225f5784b8d2c6eaba73b4`	ole-package	OLE Ole10Native stream: MBD004CA5F6/Ole10Native	324804 bytes
`ole10native_01.bin` `3961298fdb055a4eca13eb1aa9a677960dd9496a048d09da72ea9b630f40b658`	ole-package	OLE Ole10Native stream: MBD004CA5F8/OLe10NatIVe	1545 bytes

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