MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 4339763c2998a0b0a63f0a1e0034decd766d3fc8d3cf35e946a7b12c9e34ab3e. While MalwareBazaar tries to identify whether the sample provided is malicious or not, there is no guarantee that a sample in MalwareBazaar is malicious.

Database Entry


Formbook


Vendor detections: 17


Intelligence 17 IOCs YARA 1 File information Comments
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SHA256 hash: 4339763c2998a0b0a63f0a1e0034decd766d3fc8d3cf35e946a7b12c9e34ab3e
SHA3-384 hash: f67e09402d2c4e7b5e1dd430a93519dd5d0fa596c508cac0ac72b117bea34da3b83dea9bc91b81fd108d67612a7e95e0
SHA1 hash: f96aaa41de354cd1dab448738d639c317e6292d5
MD5 hash: 702f4e94882d765c245b8af2fc1984c6
humanhash: monkey-oxygen-connecticut-fifteen
File name:rockkk809543.exe
Download: download sample
Signature Formbook
Create hunting rule
File size:242'995 bytes
First seen:2023-07-10 09:38:03 UTC
Last seen:2023-07-10 10:09:39 UTC
File type:Executable exe
MIME type:application/x-dosexec
imphash 61259b55b8912888e90f516ca08dc514 (1'059 x Formbook, 741 x AgentTesla, 427 x GuLoader)
ssdeep 6144:PYa6MDEuyPQvYC0Z40foLVNwtqD8wVsxQNWB8q8lXF2:PYiEew4WcyQ9NGF8ls
Threatray 2'759 similar samples on MalwareBazaar
TLSH T17C34122CBAE4C0ABE5F146718D36936239EEFE150879970B13505B6F7C31910B26EBE1
TrID 47.3% (.EXE) Win32 Executable MS Visual C++ (generic) (31206/45/13)
15.9% (.EXE) Win64 Executable (generic) (10523/12/4)
9.9% (.DLL) Win32 Dynamic Link Library (generic) (6578/25/2)
7.6% (.EXE) Win16 NE executable (generic) (5038/12/1)
6.8% (.EXE) Win32 Executable (generic) (4505/5/1)
File icon (PE):PE icon
dhash icon b2a89c96a2cada72 (2'283 x Formbook, 981 x Loki, 803 x AgentTesla)
Reporter adrian__luca
Tags:exe FormBook

Intelligence

File Origin
# of uploads :
2
# of downloads :
274
Origin country :
HU HU
Vendor Threat Intelligence
Malware family:
formbook
Create hunting rule
ID:
1
File name:
rockkk809543.exe
Verdict:
Malicious activity
Analysis date:
2023-07-10 11:11:54 UTC
Tags:
formbook xloader
Link:
https://app.any.run/tasks/5af77e61-a715-4027-8674-3d74251ebb16

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection:
Formbook
Create hunting rule
Link:
https://www.capesandbox.com/analysis/413477/
Detection(s):
Sanesecurity.Malware.28885.BadCo.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a file in the %temp% directory
Creating a window
Creating a file
Unauthorized injection to a recently created process
Restart of the analyzed sample
Launching a process
Сreating synchronization primitives
Launching cmd.exe command interpreter
Sending a custom TCP request
Setting browser functions hooks
Unauthorized injection to a system process
Unauthorized injection to a browser process
Result
Malware family:
n/a
Score:
  5/10
Tags:
n/a
Link:
https://dragonfly.certego.net/analysis/96861/overview
Behaviour
MalwareBazaar
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
control lolbin overlay packed shell32
Link:
https://www.filescan.io/uploads/64abd1b62333b198b23a019c/reports/8a45dd2e-b506-4ae9-b01d-df1c50c3c5ad/overview
Verdict:
Malicious
Labled as:
Win/malicious_confidence_100%
Link:
https://www.hybrid-analysis.com/sample/4339763c2998a0b0a63f0a1e0034decd766d3fc8d3cf35e946a7b12c9e34ab3e
Result
Verdict:
MALICIOUS
Details
Windows PE Executable
Found a Windows Portable Executable (PE) binary. Depending on context, the presence of a binary is suspicious or malicious.
Malware family:
Formbook
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Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/a13a4201-3715-47e5-a204-b3d4081c5a88
Result
Threat name:
FormBook, NSISDropper
Create hunting rule
Detection:
malicious
Classification:
troj.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1269587
Signature
Antivirus detection for dropped file
Antivirus detection for URL or domain
C2 URLs / IPs found in malware configuration
Detected unpacking (changes PE section rights)
Found evasive API chain (may stop execution after reading information in the PEB, e.g. number of processors)
Found malware configuration
Machine Learning detection for sample
Malicious sample detected (through community Yara rule)
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)
Multi AV Scanner detection for dropped file
Multi AV Scanner detection for submitted file
Queues an APC in another process (thread injection)
Sample uses process hollowing technique
Snort IDS alert for network traffic
System process connects to network (likely due to code injection or exploit)
Tries to detect virtualization through RDTSC time measurements
Yara detected FormBook
Yara detected NSISDropper
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 1269587 Sample: rockkk809543.exe Startdate: 10/07/2023 Architecture: WINDOWS Score: 100 36 Snort IDS alert for network traffic 2->36 38 Found malware configuration 2->38 40 Malicious sample detected (through community Yara rule) 2->40 42 9 other signatures 2->42 10 rockkk809543.exe 19 2->10         started        process3 file4 28 C:\Users\user\AppData\Local\...\ueraxilf.dll, PE32 10->28 dropped 52 Detected unpacking (changes PE section rights) 10->52 54 Found evasive API chain (may stop execution after reading information in the PEB, e.g. number of processors) 10->54 56 Maps a DLL or memory area into another process 10->56 58 Tries to detect virtualization through RDTSC time measurements 10->58 14 rockkk809543.exe 10->14         started        signatures5 process6 signatures7 60 Modifies the context of a thread in another process (thread injection) 14->60 62 Maps a DLL or memory area into another process 14->62 64 Sample uses process hollowing technique 14->64 66 Queues an APC in another process (thread injection) 14->66 17 explorer.exe 2 1 14->17 injected process8 dnsIp9 30 www.caowoq.com 154.215.140.24, 49710, 80 DXTL-HKDXTLTseungKwanOServiceHK Seychelles 17->30 32 www.luicap.com 76.76.21.61, 49711, 80 AMAZON-02US United States 17->32 34 www.kkbbk.top 17->34 44 System process connects to network (likely due to code injection or exploit) 17->44 21 colorcpl.exe 17->21         started        signatures10 process11 signatures12 46 Modifies the context of a thread in another process (thread injection) 21->46 48 Maps a DLL or memory area into another process 21->48 50 Tries to detect virtualization through RDTSC time measurements 21->50 24 cmd.exe 1 21->24         started        process13 process14 26 conhost.exe 24->26         started       
Detection:
formbook
Create hunting rule
Link:
https://mwdb.cert.pl/sample/4339763c2998a0b0a63f0a1e0034decd766d3fc8d3cf35e946a7b12c9e34ab3e/
Threat name:
Win32.Trojan.Leonem
Create hunting rule
Status:
Malicious
First seen:
2023-07-03 11:29:01 UTC
File Type:
PE (Exe)
Extracted files:
3
AV detection:
30 of 38 (78.95%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=im4xmpbjtcqlbjr7bipaang6zv3g2p6i2phtl2kgu6yszhruvm7a._file
Verdict:
malicious
Label(s):
formbook
Create hunting rule
Similar samples:
14ac214aee66557d77577da7211f5fa6476753b38ff8b40738c660a88c8ffd35
Formbook
238864be2d731bc5838b95c8bb50b961d19f04b6b64d3daf323db967266fa458
Formbook
44dd86acbfa3789aec858cc6e64db784622bc6c71e6c32909cfcbcacb743e60a
Formbook
719b031a6eb4fb932f4ddc541bcd119995ea7273f77c9bbe663273401d157513
Formbook
7be1b5e4e93c8fc4f3ea7598ae04c355bd1b9ed369819a327f4a3ca3c2978c09
Formbook
9cbb812478a909df210b43c05756059fd4d35bebadcd555d265cf29d74fadc45
Formbook
bb5df98c2c7bc29973d2f2eeb67ce8b7a2f9da4166fabe5dfd70e5117e404991
Formbook
ec9d091c881ad4da6f5e77f947c2723b1aa374fbf373931871c767dfb9cabb0e
Formbook
fa3a477577604a91938f7650b04d3dfaa1d8ec12578d3bb2618817529c8b5797
Formbook
+ 2'749 additional samples on MalwareBazaar
Result
Malware family:
formbook
Create hunting rule
Score:
  10/10
Tags:
family:formbook campaign:t30k rat spyware stealer trojan
Link:
https://tria.ge/reports/230710-ll6cmshf73/
Behaviour
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: GetForegroundWindowSpam
Suspicious behavior: MapViewOfSection
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Enumerates physical storage devices
Suspicious use of SetThreadContext
Deletes itself
Loads dropped DLL
Formbook payload
Formbook
Unpacked files
SH256 hash:
6420c1b55aa4d6a6d993dad35125300575a780cf652293c5997a62e3d1fbc8dd
MD5 hash:
28d97d1536fa7131758e7a1de0d9f699
SHA1 hash:
ebfa90ac2c88d2c4f05b0d282cb389a67531517e
Detections:
FormBook
Create hunting rule
win_formbook_w0
Create hunting rule
win_formbook_auto
Create hunting rule
win_formbook_g0
Create hunting rule
Link:
https://www.unpac.me/results/01c81d83-2fbb-4786-9b2a-e42a65e1f683/
Parent samples :
4339763c2998a0b0a63f0a1e0034decd766d3fc8d3cf35e946a7b12c9e34ab3e
06c8aa9110e9c50c51464d31ef28f3cab2efdb1ca756455f99f49daada571dba
SH256 hash:
4339763c2998a0b0a63f0a1e0034decd766d3fc8d3cf35e946a7b12c9e34ab3e
MD5 hash:
702f4e94882d765c245b8af2fc1984c6
SHA1 hash:
f96aaa41de354cd1dab448738d639c317e6292d5
Link:
https://www.unpac.me/results/01c81d83-2fbb-4786-9b2a-e42a65e1f683/
Please note that we are no longer able to provide a coverage score for Virus Total.

YARA Signatures

MalwareBazaar uses YARA rules from several public and non-public repositories, such as YARAhub and Malpedia. Those are being matched against malware samples uploaded to MalwareBazaar as well as against any suspicious process dumps they may create. Please note that only results from TLP:CLEAR rules are being displayed.

Rule name:shellcode
Create hunting rule
Author:nex
Description:Matched shellcode byte patterns

File information

The table below shows additional information about this malware sample such as delivery method and external references.

Malspam

Formbook

Executable exe 4339763c2998a0b0a63f0a1e0034decd766d3fc8d3cf35e946a7b12c9e34ab3e

(this sample)

  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/413477/

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