Office (OOXML) / .XLSM malware analysis — malicious · c80a67e06086a3a0

MALICIOUS

Office (OOXML) / .XLSM

263.7 KB Created: 2021-04-12 15:51:01 UTC Authoring application: Microsoft Excel 15.0300

MD5: db16a14a0fe47030218ac4aa80670139 SHA-1: 556bfe14c2a952366b2e488e47cf095cda47e43d SHA-256: c80a67e06086a3a09b926bef2f557f1e0f9fba7fb9291a030de257f1cff18882

268 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1105 Ingress Tool Transfer

The critical heuristics indicate the presence of VBA macros, specifically a Workbook_Open macro, which is designed to execute automatically. The critical ClamAV detections confirm this is a known malicious agent. The extracted URLs are highly suspicious and likely serve as download locations for secondary payloads. The VBA macro's intent is to download and execute a second-stage payload from the embedded URLs.

Heuristics 8

ClamAV: Win.Malware.Agent-9859837-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Malware.Agent-9859837-0
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
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 project inside OOXML medium OOXML_VBA

Document contains vbaProject.bin — VBA macros present
Environ() call (env variable access) low OLE_VBA_ENVIRON

Environ() call (env variable access)
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 https://demodoctor.tdejob.work/Dr-Trina-Karmakar/css/KtPya1rG.php
- https://matchlesstravels.com.pk/backup-12-2-2019/wp-admin/css/colors/blue/6kvaiF01dZGb.php
- https://automanic.tdejob.work/hqimpLV9qAByF.php
- https://eelara.com/wp-content/plugins/smart-slider-3/Nextend/Framework/SfvcJZ0DFhvA8jR.php
- https://labonno-one.seebonerp.com/system/database/drivers/pdo/subdrivers/oFZs67rwiEDNI.php
- https://rockin1000.com.br/code/img/SocialMedia/IThiDYMU.php
- https://lifetarget.com.pt/hWNJhFYiJ.php
- https://opticahealthvision.com/wp-includes/js/tinymce/themes/inlite/6oc5yCaQGY0zv.php

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `c2d5c3107222bc035d0c89dfabd3b10c4f01e21d91273b3865881c33d7671f61`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	67224 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 18 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `f861f8a876c7d0b8fc7a024e919ad71d820a763aa1ab958f3a02b6c490c09021`	vba-project	OOXML VBA project: xl/vbaProject.bin	199680 bytes
Detection ClamAV: Win.Malware.Agent-9859837-0 Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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