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Windows
Analysis Report
tYEY1UeurGz0Mjb.exe
Overview
General Information
| Sample name: | tYEY1UeurGz0Mjb.exe |
| Analysis ID: | 1467706 |
| MD5: | a9c37f81cd9a181dab2262d2f8456a76 |
| SHA1: | 549e7a8c8e998d3b7f85e61a7171685af231e780 |
| SHA256: | 76650fb8aeaf679cd204ca347026a67767ab8d9c27f65597b275d8d57327e096 |
| Tags: | exe |
| Infos: |   |
 | |
Detection
FormBook
| Score: | 100 |
| Range: | 0 - 100 |
| Whitelisted: | false |
| Confidence: | 100% |
Signatures
Found malware configuration
Malicious sample detected (through community Yara rule)
Multi AV Scanner detection for submitted file
Snort IDS alert for network traffic
System process connects to network (likely due to code injection or exploit)
Yara detected AntiVM3
Yara detected FormBook
.NET source code contains potential unpacker
.NET source code contains very large array initializations
AI detected suspicious sample
C2 URLs / IPs found in malware configuration
Found direct / indirect Syscall (likely to bypass EDR)
Injects a PE file into a foreign processes
Machine Learning detection for sample
Maps a DLL or memory area into another process
Modifies the context of a thread in another process (thread injection)
Modifies the prolog of user mode functions (user mode inline hooks)
Performs DNS queries to domains with low reputation
Queues an APC in another process (thread injection)
Sample uses process hollowing technique
Switches to a custom stack to bypass stack traces
Tries to detect virtualization through RDTSC time measurements
Allocates memory with a write watch (potentially for evading sandboxes)
Binary contains a suspicious time stamp
Checks if the current process is being debugged
Contains functionality for execution timing, often used to detect debuggers
Contains functionality to access loader functionality (e.g. LdrGetProcedureAddress)
Contains functionality to call native functions
Contains functionality to communicate with device drivers
Contains functionality to open a port and listen for incoming connection (possibly a backdoor)
Contains functionality to read the PEB
Contains functionality which may be used to detect a debugger (GetProcessHeap)
Contains long sleeps (>= 3 min)
Creates a process in suspended mode (likely to inject code)
Detected potential crypto function
Enables debug privileges
Found a high number of Window / User specific system calls (may be a loop to detect user behavior)
Found decision node followed by non-executed suspicious APIs
Found inlined nop instructions (likely shell or obfuscated code)
Found large amount of non-executed APIs
Found potential string decryption / allocating functions
HTTP GET or POST without a user agent
IP address seen in connection with other malware
Internet Provider seen in connection with other malware
May sleep (evasive loops) to hinder dynamic analysis
Queries the volume information (name, serial number etc) of a device
Sample execution stops while process was sleeping (likely an evasion)
Sample file is different than original file name gathered from version info
Sigma detected: Unusual Parent Process For Cmd.EXE
Uses 32bit PE files
Uses code obfuscation techniques (call, push, ret)
Yara signature match
Classification
- System is w10x64
tYEY1UeurGz0Mjb.exe (PID: 4196 cmdline: "C:\Users\ user\Deskt op\tYEY1Ue urGz0Mjb.e xe" MD5: A9C37F81CD9A181DAB2262D2F8456A76) - tYEY1UeurGz0Mjb.exe (PID: 1216 cmdline:
"C:\Users\ user\Deskt op\tYEY1Ue urGz0Mjb.e xe" MD5: A9C37F81CD9A181DAB2262D2F8456A76) 
explorer.exe (PID: 1028 cmdline: C:\Windows \Explorer. EXE MD5: 662F4F92FDE3557E86D110526BB578D5) - wlanext.exe (PID: 3876 cmdline:
"C:\Window s\SysWOW64 \wlanext.e xe" MD5: 0D5F0A7CA2A8A47E3A26FB1CB67E118C) 
cmd.exe (PID: 1788 cmdline: /c del "C: \Users\use r\Desktop\ tYEY1UeurG z0Mjb.exe" MD5: D0FCE3AFA6AA1D58CE9FA336CC2B675B) - conhost.exe (PID: 2316 cmdline:
C:\Windows \system32\ conhost.ex e 0xffffff ff -ForceV 1 MD5: 0D698AF330FD17BEE3BF90011D49251D)
- cleanup
| Name | Description | Attribution | Blogpost URLs | Link |
|---|---|---|---|---|
| Formbook, Formbo | FormBook contains a unique crypter RunPE that has unique behavioral patterns subject to detection. It was initially called "Babushka Crypter" by Insidemalware. |
{"C2 list": ["www.cpuk-finance.com/dy13/"], "decoy": ["manga-house.com", "kjsdhklssk51.xyz", "b0ba138.xyz", "bt365033.com", "ccbsinc.net", "mrwine.xyz", "nrxkrd527o.xyz", "hoshi.social", "1912ai.com", "serco2020.com", "byfchfyr.xyz", "imuschestvostorgov.online", "austinheafey.com", "mrdfa.club", "883106.photos", "profitablefxmarkets.com", "taini00.net", "brye.top", "ginsm.com", "sportglid.com", "hdretailllc.com", "umeshraja.com", "bum-arch.com", "carefulapp.com", "kjqlq.top", "3dsciagames.com", "520yhy.com", "magahatinu.com", "freedompopo.com", "directgaragedoor.com", "tyupok.xyz", "thecrystore.com", "camperelektrikde.shop", "soloparentconnect.com", "sonderfullcoaching.com", "jesuscrewofficial.com", "oioc.xyz", "assineunitv.com", "whysco.com", "484844.vip", "gdctus840t.top", "acc-pay.top", "bdsmnutzbar.info", "sdplat.media", "cioncarp4213.com", "facecasino2.top", "bankablebark.com", "gulerweb.online", "radheyranidailyproduct.com", "fin4d-sl.com", "northshorehousekeeping.com", "femmeteefatale.com", "d0ge6or54x07cfn.xyz", "craftwhirl.com", "kgfna.biz", "real-estate-96841.bond", "cfuhtkwo.xyz", "nestormediaproduction.com", "txglobedev.com", "kermoal.dev", "yr8gl32.vip", "bathroomremodelnearyou.today", "nearmeacupuncture.com", "chicstop.store"]}| Source | Rule | Description | Author | Strings |
|---|---|---|---|---|
| JoeSecurity_FormBook | Yara detected FormBook | Joe Security | ||
| JoeSecurity_FormBook_1 | Yara detected FormBook | Joe Security | ||
| Windows_Trojan_Formbook_1112e116 | unknown | unknown |
| |
| Formbook_1 | autogenerated rule brought to you by yara-signator | Felix Bilstein - yara-signator at cocacoding dot com |
| |
| Formbook | detect Formbook in memory | JPCERT/CC Incident Response Group |
| |
| Click to see the 24 entries | ||||
| Source | Rule | Description | Author | Strings |
|---|---|---|---|---|
| JoeSecurity_FormBook | Yara detected FormBook | Joe Security | ||
| JoeSecurity_FormBook_1 | Yara detected FormBook | Joe Security | ||
| Windows_Trojan_Formbook_1112e116 | unknown | unknown |
| |
| Formbook_1 | autogenerated rule brought to you by yara-signator | Felix Bilstein - yara-signator at cocacoding dot com |
| |
| Formbook | detect Formbook in memory | JPCERT/CC Incident Response Group |
| |
| Click to see the 5 entries | ||||
System Summary |   |
|---|
| Source: | Author: Tim Rauch: | ||
| Timestamp: | 07/04/24-16:34:26.175750 |
| SID: | 2031412 |
| Source Port: | 49716 |
| Destination Port: | 80 |
| Protocol: | TCP |
| Classtype: | A Network Trojan was detected |
| Timestamp: | 07/04/24-16:37:49.666946 |
| SID: | 2031412 |
| Source Port: | 49725 |
| Destination Port: | 80 |
| Protocol: | TCP |
| Classtype: | A Network Trojan was detected |
| Timestamp: | 07/04/24-16:36:27.968302 |
| SID: | 2031412 |
| Source Port: | 49722 |
| Destination Port: | 80 |
| Protocol: | TCP |
| Classtype: | A Network Trojan was detected |
| Timestamp: | 07/04/24-16:34:46.796764 |
| SID: | 2031412 |
| Source Port: | 49717 |
| Destination Port: | 80 |
| Protocol: | TCP |
| Classtype: | A Network Trojan was detected |
| Timestamp: | 07/04/24-16:35:46.877456 |
| SID: | 2031412 |
| Source Port: | 49720 |
| Destination Port: | 80 |
| Protocol: | TCP |
| Classtype: | A Network Trojan was detected |
| Timestamp: | 07/04/24-16:35:26.166423 |
| SID: | 2031412 |
| Source Port: | 49719 |
| Destination Port: | 80 |
| Protocol: | TCP |
| Classtype: | A Network Trojan was detected |
| Timestamp: | 07/04/24-16:36:49.977451 |
| SID: | 2031412 |
| Source Port: | 49723 |
| Destination Port: | 80 |
| Protocol: | TCP |
| Classtype: | A Network Trojan was detected |
| Timestamp: | 07/04/24-16:37:09.149461 |
| SID: | 2031412 |
| Source Port: | 49724 |
| Destination Port: | 80 |
| Protocol: | TCP |
| Classtype: | A Network Trojan was detected |
| Timestamp: | 07/04/24-16:36:07.818487 |
| SID: | 2031412 |
| Source Port: | 49721 |
| Destination Port: | 80 |
| Protocol: | TCP |
| Classtype: | A Network Trojan was detected |
| Timestamp: | 07/04/24-16:38:31.660414 |
| SID: | 2031412 |
| Source Port: | 49727 |
| Destination Port: | 80 |
| Protocol: | TCP |
| Classtype: | A Network Trojan was detected |
| Timestamp: | 07/04/24-16:38:10.816088 |
| SID: | 2031412 |
| Source Port: | 49726 |
| Destination Port: | 80 |
| Protocol: | TCP |
| Classtype: | A Network Trojan was detected |
Click to jump to signature section
Show All Signature Results
AV Detection | |
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| Source: | Malware Configuration Extractor: | ||
| Source: | ReversingLabs: | ||
| Source: | File source: | ||
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| Source: | Integrated Neural Analysis Model: | ||
| Source: | Joe Sandbox ML: | ||
| Source: | Static PE information: | ||
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| Source: | Binary string: | ||
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| Source: | Code function: | 0_2_0766A059 | |
| Source: | Code function: | 3_2_00407B26 | |
| Source: | Code function: | 5_2_00BB7B26 | |
Networking | |
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| Source: | Snort IDS: | ||
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| Source: | Network Connect: | Jump to behavior | ||
| Source: | Network Connect: | Jump to behavior | ||
| Source: | Network Connect: | Jump to behavior | ||
| Source: | Network Connect: | Jump to behavior | ||
| Source: | Network Connect: | Jump to behavior | ||
| Source: | Network Connect: | Jump to behavior | ||
| Source: | Network Connect: | Jump to behavior | ||
| Source: | Network Connect: | Jump to behavior | ||
| Source: | Network Connect: | Jump to behavior | ||
| Source: | URLs: | ||
| Source: | DNS query: | ||
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| Source: | HTTP traffic detected: | ||
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| Source: | UDP traffic detected without corresponding DNS query: | ||
| Source: | UDP traffic detected without corresponding DNS query: | ||
| Source: | UDP traffic detected without corresponding DNS query: | ||
| Source: | UDP traffic detected without corresponding DNS query: | ||
| Source: | UDP traffic detected without corresponding DNS query: | ||
| Source: | UDP traffic detected without corresponding DNS query: | ||
| Source: | UDP traffic detected without corresponding DNS query: | ||
| Source: | UDP traffic detected without corresponding DNS query: | ||
| Source: | UDP traffic detected without corresponding DNS query: | ||
| Source: | UDP traffic detected without corresponding DNS query: | ||
| Source: | UDP traffic detected without corresponding DNS query: | ||
| Source: | UDP traffic detected without corresponding DNS query: | ||
| Source: | UDP traffic detected without corresponding DNS query: | ||
| Source: | Code function: | 4_2_107D8F82 | |
| Source: | HTTP traffic detected: | ||
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| Source: | DNS traffic detected: | ||
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