Office (OOXML) malware analysis — malicious · ac562ba12ff299f0

MALICIOUS

Office (OOXML)

26.4 KB Created: 2021-08-18 02:04:39 UTC Authoring application: Microsoft Excel 16.0300

MD5: 0fc16382500e8271c4b71b7d5382dce9 SHA-1: f6ffa1ecb68b5e7edd6ede2d099cd30a337604c6 SHA-256: ac562ba12ff299f01b0f67f905788f1d4a62ebb3539aee323852d2c20ce9e57c

610 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1140 Deobfuscate/Decode Files or Information T1204.002 Malicious File T1071.001 Web Protocols T1105 Ingress Tool Transfer

The sample contains VBA macros that execute upon opening, utilizing WScript.Shell and CreateObject to download a payload from a hardcoded URL. The script attempts to save the downloaded content to '%TEMP%\Details.dat' and '%TEMP%\LeakDetails.dat', indicating a downloader functionality. The document body content suggests a credential harvesting lure, presenting leaked password information to trick users.

Heuristics 14

Shell() call in VBA critical OLE_VBA_SHELL

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

WScript.Shell usage
Obfuscated VBA Shell command with URL critical OLE_VBA_OBFUSCATED_SHELL_URL

VBA macro invokes Shell with command text assembled through decoder or string-manipulation functions and includes a URL. This is a high-confidence downloader/dropper pattern, stronger than Shell or URL evidence on their own.
VBA WMI Win32_Process launcher critical OLE_VBA_WMI_PROCESS_CREATE

VBA macro builds or references a WMI moniker for Win32_Process and invokes .Create to start a command. This is a high-confidence macro execution chain that often hides the WMI class name through string concatenation or helper functions.
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.Downloader.Valyria-10026858-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.Valyria-10026858-0
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.
Auto_Open macro high OLE_VBA_AUTO

Auto_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
GetObject call high OLE_VBA_GETOBJ

GetObject 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 project inside OOXML medium OOXML_VBA

Document contains a VBA project — 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 http://ec2-18-184-17-12.eu-central-1.compute.amazonaws.com/standardchartered/passleak/180821/

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `38668a42dbd34cbf9e7e1b472b338e4fe6d3b8515bc55a80526a5c68d0240d4e`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	4717 bytes
`vbaProject_00.bin` `6be63d31fc0f7bc8082fcda17ad49edad3ce91713e0a7bec11136e5410cc68d1`	vba-project	OOXML VBA project: xl/vbaProject.bin	18432 bytes
Detection ClamAV: Doc.Downloader.Valyria-10026858-0 Obfuscation or payload: unlikely

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