Office (OOXML) / .XLSX malware analysis — malicious · 392988c5f51a2a6d

MALICIOUS

Office (OOXML) / .XLSX

62.3 KB Created: 2020-06-01 10:54:58 UTC Authoring application: 16.0300

MD5: fefe7184f1d5ce17b4f7bdc61b3bc2aa SHA-1: 24390451f80a55067f7877e635465411b07144b6 SHA-256: 392988c5f51a2a6d9ccb87b16d8b193b1dbb3325d3ca901e0dc9a2e60587f01e

260 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is an OOXML document containing VBA macros. Critical heuristics indicate the use of Shell() and WScript.Shell, suggesting the macros are designed to execute arbitrary commands. The ClamAV detection name 'Doc.Dropper.Agent-7994926-0' further supports that this file acts as a dropper for malicious payloads. The 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-7994926-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Dropper.Agent-7994926-0
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` `89a2b175bbc42cc3cf5e09b5ef369095f1d01df5215c7cf9f1e952584039c48e`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1125 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`vbaProject_00.bin` `64b54b6d842fb8ece315ca59c931398b5035b9d207472e2d4b46a305380048c1`	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` `3c7098ffdcd9f678a1aaaf6bae5fb75c25cca9ac8533dd1c4212109af7748ab1`	ooxml-emf	OOXML EMF part: xl/media/image1.emf	1976 bytes

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