Office (OOXML) / .XLSM malware analysis — malicious · ca6cc70d74efc75a

MALICIOUS

Office (OOXML) / .XLSM

110.3 KB Created: 2020-06-29 07:21:29 UTC Authoring application: Microsoft Excel 16.0300

MD5: c4deec389d7dc503009a4c5bd7c63588 SHA-1: 972bb13b31324ff46d8e93cefbc340ecd842f884 SHA-256: ca6cc70d74efc75a530234f9cc97a751b3fd713ca11d2235db7436e4f00cb52e

260 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample is an XLSM file containing VBA macros. Heuristics indicate the use of Shell() and WScript.Shell, suggesting the execution of arbitrary commands. The ClamAV detection name 'Doc.Dropper.Agent-8383926-0' strongly implies a dropper functionality, which typically downloads and executes a second-stage payload. The document body content is numerical and does not provide contextual clues for the attack pattern.

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-8383926-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Dropper.Agent-8383926-0
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` `292795551001817bd985f45adf881040d493d201479fbe4bcdfc83747a4242c6`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1257 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`vbaProject_00.bin` `b29c0aae178a0e8227015abbff702251971883eff1eb551b0e7e9d0014fbd29d`	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` `63d5db2c6422a9453c65a1e20c99b3437a9aedc71f9053896ee2dc73dcca8803`	ooxml-emf	OOXML EMF part: xl/media/image1.emf	2380 bytes

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