Xls.Downloader.Trojan-aa0b8f388d8573cd — Office (OOXML) / .XLSX malware analysis

Static analysis result for SHA-256 9054b5beca276815…

MALICIOUS

Office (OOXML) / .XLSX

845.9 KB Created: 2022-05-16 17:34:45 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-01-17
MD5: 50dd5f0dda762d4e809c4d258a86758d SHA-1: 9a2c11c37f417479c031452f3918ece065b403f2 SHA-256: 9054b5beca276815447586fc810a0568113327d70cbad40505dd83eb86a35253
120 Risk Score

Malware Insights

Xls.Downloader.Trojan-aa0b8f388d8573cd · confidence 95%

MITRE ATT&CK
T1204 Malicious File T1566 Phishing

The critical ClamAV heuristic identifies the file as 'Xls.Downloader.Trojan-aa0b8f388d8573cd'. This is further supported by the presence of an embedded OLE object, specifically an Equation Editor object, which is a common technique for delivering malware. The file's structure and detection name strongly suggest it functions as a downloader for additional malicious content.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/kn7RTdo.fRW contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • ClamAV: Xls.Downloader.Trojan-aa0b8f388d8573cd-aa0b8f388d8573cd-9950439-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Trojan-aa0b8f388d8573cd-aa0b8f388d8573cd-9950439-0
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
e1f609bb38e229d1a39d38d9d77401d85ffba786f50b16fc5b16ab125d6420b7		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/kn7RTdo.fRW 1038848 bytes
ooxml_oleobject_00_ole10native_00.bin
3d66cace444c5a555ad71f341c8d61af7adc1cfd4ef9f42b52dbc2dc9c29b94e		 ole-package OOXML xl/embeddings/kn7RTdo.fRW Ole10Native stream: ole10nAtIvE 1028127 bytes
emf_00.emf
38f17a599ac5d645df3840bbb401710ef81573a747da20abbfc1b7d9a9273b58		 ooxml-emf OOXML EMF part: xl/media/image1.emf 169096 bytes

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