Office (OLE) / .XLS malware analysis — malicious · 55c32a9bd16c2d91

MALICIOUS

Office (OLE) / .XLS

504.5 KB Created: 2022-10-26 22:16:42 Authoring application: Microsoft Excel First seen: 2022-10-27

MD5: 2da13a1f88dfb75e1f1a37fc4212adf4 SHA-1: ae03c0d7a946d97b148af77436f7495e0d9096a4 SHA-256: 55c32a9bd16c2d9113c92d2b57f2204aee9f1685c0496cea083309bb70d86c6f

462 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1105 Ingress Tool Transfer T1204.002 Malicious File

The file contains VBA macros with AutoOpen and Workbook_Open subroutines, indicating an attempt to automatically execute malicious code upon opening. Critical heuristics indicate the use of WScript.Shell and a Shell() call to download and execute a file from the embedded URL http://oslobikerental.no.ww18.online4u.no/wp-includes/ID2/ups/IMG00120474.exe, consistent with a dropper malware.

Heuristics 11

Shell() call in VBA critical OLE_VBA_SHELL

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

WScript.Shell usage
VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC

VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
ClamAV: Doc.Dropper.Agent-6412232-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Dropper.Agent-6412232-1
Reference to Windows Script Host high SC_STR_WSCRIPT

Reference to Windows Script Host
AutoOpen macro high OLE_VBA_AUTOOPEN

AutoOpen macro
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.
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://oslobikerental.no.ww18.online4u.no/wp-includes/ID2/ups/IMG00120474.exe

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `c1393e843d5d57bb92b12282ea1068586c11bceca5a1e3e841c59538562211ff`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	79289 bytes

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