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Windows Analysis Report
NHYGUnNN.exe

Overview

General Information

Sample Name:NHYGUnNN.exe
Analysis ID:756156
MD5:4f9c8432b57fa1aa875071de547ba947
SHA1:e1cc52fd851621743ba562a65161bfafed8e6b2b
SHA256:9f0d17930a9312b8d8dfb23119b57fed676a1bb15fc1582754ab94201651b221
Tags:exeformbook
Infos:

Detection

FormBook
Score:100
Range:0 - 100
Whitelisted:false
Confidence:100%

Signatures

Multi AV Scanner detection for submitted file
Yara detected FormBook
Malicious sample detected (through community Yara rule)
System process connects to network (likely due to code injection or exploit)
Snort IDS alert for network traffic
Sample uses process hollowing technique
Tries to steal Mail credentials (via file / registry access)
Uses netstat to query active network connections and open ports
Maps a DLL or memory area into another process
Writes to foreign memory regions
Machine Learning detection for sample
Allocates memory in foreign processes
.NET source code contains potential unpacker
Injects a PE file into a foreign processes
Queues an APC in another process (thread injection)
Modifies the context of a thread in another process (thread injection)
C2 URLs / IPs found in malware configuration
Tries to harvest and steal browser information (history, passwords, etc)
Queries the volume information (name, serial number etc) of a device
Yara signature match
May sleep (evasive loops) to hinder dynamic analysis
Uses code obfuscation techniques (call, push, ret)
Internet Provider seen in connection with other malware
Detected potential crypto function
Found potential string decryption / allocating functions
Sample execution stops while process was sleeping (likely an evasion)
Contains functionality to call native functions
HTTP GET or POST without a user agent
IP address seen in connection with other malware
Contains functionality for execution timing, often used to detect debuggers
Contains long sleeps (>= 3 min)
Found inlined nop instructions (likely shell or obfuscated code)
PE file does not import any functions
Sample file is different than original file name gathered from version info
Contains functionality to read the PEB
Uses a known web browser user agent for HTTP communication
Checks if the current process is being debugged
Found large amount of non-executed APIs
Creates a process in suspended mode (likely to inject code)
Contains functionality to access loader functionality (e.g. LdrGetProcedureAddress)

Classification

  • System is w10x64
  • NHYGUnNN.exe (PID: 5380 cmdline: C:\Users\user\Desktop\NHYGUnNN.exe MD5: 4F9C8432B57FA1AA875071DE547BA947)
    • RegSvcs.exe (PID: 5148 cmdline: C:\Windows\Microsoft.NET\Framework\v4.0.30319\Regsvcs.exe MD5: 2867A3817C9245F7CF518524DFD18F28)
      • explorer.exe (PID: 3452 cmdline: C:\Windows\Explorer.EXE MD5: AD5296B280E8F522A8A897C96BAB0E1D)
        • NETSTAT.EXE (PID: 4844 cmdline: C:\Windows\SysWOW64\NETSTAT.EXE MD5: 4E20FF629119A809BC0E7EE2D18A7FDB)
  • cleanup
{"C2 list": ["www.needook.com/4u5a/"]}
SourceRuleDescriptionAuthorStrings
0000000A.00000002.497449022.0000000000FE0000.00000040.10000000.00040000.00000000.sdmpJoeSecurity_FormBookYara detected FormBookJoe Security
    0000000A.00000002.497449022.0000000000FE0000.00000040.10000000.00040000.00000000.sdmpWindows_Trojan_Formbook_1112e116unknownunknown
    • 0x6631:$a1: 3C 30 50 4F 53 54 74 09 40
    • 0x1f070:$a2: 74 0A 4E 0F B6 08 8D 44 08 01 75 F6 8D 70 01 0F B6 00 8D 55
    • 0xa8cf:$a3: 1A D2 80 E2 AF 80 C2 7E EB 2A 80 FA 2F 75 11 8A D0 80 E2 01
    • 0x17e07:$a4: 04 83 C4 0C 83 06 07 5B 5F 5E 8B E5 5D C3 8B 17 03 55 0C 6A 01 83
    0000000A.00000002.497449022.0000000000FE0000.00000040.10000000.00040000.00000000.sdmpFormbook_1autogenerated rule brought to you by yara-signatorFelix Bilstein - yara-signator at cocacoding dot com
    • 0x17c05:$sequence_1: 3C 24 0F 84 76 FF FF FF 3C 25 74 94
    • 0x176b1:$sequence_2: 3B 4F 14 73 95 85 C9 74 91
    • 0x17d07:$sequence_3: 3C 69 75 44 8B 7D 18 8B 0F
    • 0x17e7f:$sequence_4: 5D C3 8D 50 7C 80 FA 07
    • 0xa49a:$sequence_5: 0F BE 5C 0E 01 0F B6 54 0E 02 83 E3 0F C1 EA 06
    • 0x168fc:$sequence_6: 57 89 45 FC 89 45 F4 89 45 F8
    • 0x1dde7:$sequence_8: 3C 54 74 04 3C 74 75 F4
    • 0x1edda:$sequence_9: 56 68 03 01 00 00 8D 85 95 FE FF FF 6A 00
    0000000A.00000002.497449022.0000000000FE0000.00000040.10000000.00040000.00000000.sdmpFormbookdetect Formbook in memoryJPCERT/CC Incident Response Group
    • 0x1a0e9:$sqlite3step: 68 34 1C 7B E1
    • 0x1ac61:$sqlite3step: 68 34 1C 7B E1
    • 0x1a12b:$sqlite3text: 68 38 2A 90 C5
    • 0x1aca6:$sqlite3text: 68 38 2A 90 C5
    • 0x1a142:$sqlite3blob: 68 53 D8 7F 8C
    • 0x1acbc:$sqlite3blob: 68 53 D8 7F 8C
    0000000A.00000002.497017430.0000000000BC0000.00000040.80000000.00040000.00000000.sdmpJoeSecurity_FormBookYara detected FormBookJoe Security
      Click to see the 18 entries
      No Sigma rule has matched
      Timestamp:192.168.2.6154.209.6.24149722802829004 11/29/22-18:25:42.914102
      SID:2829004
      Source Port:49722
      Destination Port:80
      Protocol:TCP
      Classtype:A Network Trojan was detected

      Click to jump to signature section

      Show All Signature Results

      AV Detection

      barindex
      Source: NHYGUnNN.exeReversingLabs: Detection: 27%
      Source: Yara matchFile source: 0000000A.00000002.497449022.0000000000FE0000.00000040.10000000.00040000.00000000.sdmp, type: MEMORY
      Source: Yara matchFile source: 0000000A.00000002.497017430.0000000000BC0000.00000040.80000000.00040000.00000000.sdmp, type: MEMORY
      Source: Yara matchFile source: 0000000A.00000002.497846833.0000000003060000.00000004.00000800.00020000.00000000.sdmp, type: MEMORY
      Source: Yara matchFile source: 00000001.00000002.317923143.0000000000401000.00000040.00000400.00020000.00000000.sdmp, type: MEMORY
      Source: Yara matchFile source: 00000002.00000000.291033635.0000000013485000.00000040.00000001.00040000.00000000.sdmp, type: MEMORY
      Source: NHYGUnNN.exeJoe Sandbox ML: detected
      Source: 0000000A.00000002.497449022.0000000000FE0000.00000040.10000000.00040000.00000000.sdmpMalware Configuration Extractor: FormBook {"C2 list": ["www.needook.com/4u5a/"]}
      Source: NHYGUnNN.exeStatic PE information: HIGH_ENTROPY_VA, DYNAMIC_BASE, NX_COMPAT, NO_SEH, TERMINAL_SERVER_AWARE
      Source: Binary string: C:\Users\Administrator\Documents\CryptoObfuscator_Output\HMMCXNXCJKFD.pdb source: NHYGUnNN.exe
      Source: Binary string: RegSvcs.pdb, source: NETSTAT.EXE, 0000000A.00000002.501502525.00000000038B3000.00000004.10000000.00040000.00000000.sdmp
      Source: Binary string: wntdll.pdbUGP source: RegSvcs.exe, 00000001.00000003.237929727.0000000001137000.00000004.00000800.00020000.00000000.sdmp, RegSvcs.exe, 00000001.00000002.318452045.00000000012D0000.00000040.00000800.00020000.00000000.sdmp, RegSvcs.exe, 00000001.00000003.236683417.0000000000F98000.00000004.00000800.00020000.00000000.sdmp, NETSTAT.EXE, 0000000A.00000002.500840419.000000000368F000.00000040.00000800.00020000.00000000.sdmp, NETSTAT.EXE, 0000000A.00000003.320124356.00000000033DE000.00000004.00000800.00020000.00000000.sdmp, NETSTAT.EXE, 0000000A.00000003.318032789.00000000031D3000.00000004.00000800.00020000.00000000.sdmp, NETSTAT.EXE, 0000000A.00000002.499590658.0000000003570000.00000040.00000800.00020000.00000000.sdmp
      Source: Binary string: C:\Users\Administrator\Documents\CryptoObfuscator_Output\BUMBUM.pdb source: NHYGUnNN.exe, 00000000.00000002.238037858.0000012A279A8000.00000004.00000800.00020000.00000000.sdmp, NHYGUnNN.exe, 00000000.00000002.237890834.0000012A27840000.00000004.08000000.00040000.00000000.sdmp
      Source: Binary string: wntdll.pdb source: RegSvcs.exe, RegSvcs.exe, 00000001.00000003.237929727.0000000001137000.00000004.00000800.00020000.00000000.sdmp, RegSvcs.exe, 00000001.00000002.318452045.00000000012D0000.00000040.00000800.00020000.00000000.sdmp, RegSvcs.exe, 00000001.00000003.236683417.0000000000F98000.00000004.00000800.00020000.00000000.sdmp, NETSTAT.EXE, NETSTAT.EXE, 0000000A.00000002.500840419.000000000368F000.00000040.00000800.00020000.00000000.sdmp, NETSTAT.EXE, 0000000A.00000003.320124356.00000000033DE000.00000004.00000800.00020000.00000000.sdmp, NETSTAT.EXE, 0000000A.00000003.318032789.00000000031D3000.00000004.00000800.00020000.00000000.sdmp, NETSTAT.EXE, 0000000A.00000002.499590658.0000000003570000.00000040.00000800.00020000.00000000.sdmp
      Source: Binary string: C:\Users\Administrator\Documents\CryptoObfuscator_Output\HMMCXNXCJKFD.pdbBSJB source: NHYGUnNN.exe
      Source: Binary string: RegSvcs.pdb source: NETSTAT.EXE, 0000000A.00000002.501502525.00000000038B3000.00000004.10000000.00040000.00000000.sdmp
      Source: Binary string: C:\Users\Administrator\Documents\CryptoObfuscator_Output\BUMBUM.pdbBSJB source: NHYGUnNN.exe, 00000000.00000002.238037858.0000012A279A8000.00000004.00000800.00020000.00000000.sdmp, NHYGUnNN.exe, 00000000.00000002.237890834.0000012A27840000.00000004.08000000.00040000.00000000.sdmp