Office (OOXML) / .XLSX malware analysis — malicious · b2281e8e33f7ec70

MALICIOUS

Office (OOXML) / .XLSX

63.3 KB Created: 2020-05-27 09:14:17 UTC Authoring application: 16.0300

MD5: cccfdbf33057bf6e55dba54c3aa1a38a SHA-1: 6f9c72c53703020ad78f013a8fa794a1118e56e3 SHA-256: b2281e8e33f7ec70cf3d48a5335f87c9186bb1365eb5ecc9081825593dc110e3

260 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The file is an OOXML spreadsheet containing VBA macros. Critical heuristics indicate the use of Shell() and WScript.Shell, suggesting the execution of external commands or scripts. The ClamAV detection name 'Doc.Dropper.Agent-7915678-0' further supports its nature as a dropper. The VBA macros likely download and execute a second-stage payload.

Heuristics 6

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
WScript.Shell usage critical OLE_VBA_WSCRIPT

WScript.Shell usage
ClamAV: Doc.Dropper.Agent-7915678-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Dropper.Agent-7915678-0
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
VBA project inside OOXML medium OOXML_VBA

Document contains vbaProject.bin — VBA macros present
Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `8f97539bb215484426cdd968fc034de1bcfe9bda395adc64858e49160fbc66d5`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1179 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`vbaProject_00.bin` `eec1453f3bf5bc78f19304d2dd16aaafb9ca30917db2803b7a85a722a56a0816`	vba-project	OOXML VBA project: xl/vbaProject.bin	10752 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`emf_00.emf` `76f287b1e3251b7e0e5ba27bfb05b35831150cc665de00f9fd2d807e2d2a028d`	ooxml-emf	OOXML EMF part: xl/media/image1.emf	1976 bytes

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