Office (OLE) / .XLS malware analysis — malicious · 23899b554cdd3593

MALICIOUS

Office (OLE) / .XLS

386.0 KB Created: 2021-04-13 13:37:17 Authoring application: Microsoft Excel

MD5: 661ec5ef58c4f81b219aec92030022c9 SHA-1: 07f8435c95c2ac3fe2854f821b51bd20acb1b3bc SHA-256: 23899b554cdd359336b0ecd92780ab7918845bc5b73169acdc61d4f3abc598f9

222 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The sample is an XLS file containing a Workbook_Open VBA macro. This macro utilizes CreateObject to execute code, indicated by the OLE_VBA_PCODE_AUTOEXEC_EXEC heuristic. The embedded URL suggests the macro's purpose is to download and execute a second-stage payload. The presence of Windows Script Host references further supports the execution of external code.

Heuristics 7

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
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — context-specific rules above attribute URLs they actually evaluated; this rule lists URLs that were present in the bytes but were not otherwise tied to a specific finding.

URL http://45.85.90.14/i88/Rmcpg.ex

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `eec1ddf844b427a98b0a411cae3acc14ddc27f6f3038618634947bd609ebd1bf`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1169 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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