Office (OLE) / .XLS malware analysis — malicious · b3fe4fd7f741756b

MALICIOUS

Office (OLE) / .XLS

308.0 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel First seen: 2022-06-23

MD5: 2a8fc05d9cd4d4069c4c42f3b3096a9b SHA-1: 3c39d93c019e724a78bc5586b06e48b8ee40d78e SHA-256: b3fe4fd7f741756b5632607a83a4269984b1059f7b60550bafd87482d638b968

340 Risk Score

Malware Insights

MITRE ATT&CK

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

The critical OLE_VBA_SHELL and OLE_VBA_WSCRIPT heuristics indicate the use of WScript.Shell within VBA macros. The Workbook_Open auto-execution combined with the Shell() call strongly suggests the macro attempts to download and execute a second-stage payload. The obfuscated VBA code, particularly the string concatenation for registry paths like 'HKCU\Software\Microsoft\Windows\CurrentVersion\Run\IAccessible2Proxy', points to a persistence mechanism. The 'Tryoin to Openiu The kbzg Document' text in the DOC BODY is a lure.

Heuristics 8

Shell() call in VBA critical OLE_VBA_SHELL

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

WScript.Shell usage
Reference to Windows Script Host high SC_STR_WSCRIPT

Reference to Windows Script Host
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC

Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
Suspicious extracted artifact high 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.
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `d005689ddffb8e37bcf30fb1cdee3eacd53df2dacfc4047021a269cbef70b1a6`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	13279 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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