MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 876186ad1969e2f202fd93fdde333f8d042e4dd35c687a8f17723f77788d1837. 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: 18


Intelligence 18 IOCs YARA 17 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 876186ad1969e2f202fd93fdde333f8d042e4dd35c687a8f17723f77788d1837
SHA3-384 hash: 22606a218f50822fc0ca949977bd08e10e7fdd3b3c69a140d8e590340033eb2e181101dc89493f7f011ab99ffb17c0ea
SHA1 hash: f5bd63cba881ab9ca58b438fb295a53f26a74df3
MD5 hash: 39aba001709bc965fc99edd9b6d8c059
humanhash: pasta-solar-lake-winter
File name:RXw55HEgLS9aHXD.exe
Download: download sample
Signature Formbook
Create hunting rule
File size:672'776 bytes
First seen:2025-06-04 13:15:50 UTC
Last seen:2025-06-16 08:40:18 UTC
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'649 x AgentTesla, 19'461 x Formbook, 12'202 x SnakeKeylogger)
ssdeep 12288:NzMuqP8jjanq2eXr83XKrDnCNDhr4bJ3pQ4ROMbcueq+kR:JMRYXdX4n9PQRIc
Threatray 2'577 similar samples on MalwareBazaar
TLSH T19CE4F108B15C9B03D1B20BF55660C1B117FAAD8EA421CB5A8FCBADEB39D2F05175139B
TrID 71.1% (.EXE) Generic CIL Executable (.NET, Mono, etc.) (73123/4/13)
10.2% (.EXE) Win64 Executable (generic) (10522/11/4)
6.3% (.DLL) Win32 Dynamic Link Library (generic) (6578/25/2)
4.3% (.EXE) Win32 Executable (generic) (4504/4/1)
2.0% (.ICL) Windows Icons Library (generic) (2059/9)
Magika pebin
Reporter James_inthe_box
Tags:exe FormBook

Intelligence

File Origin
# of uploads :
2
# of downloads :
401
Origin country :
US US
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
RXw55HEgLS9aHXD.exe
Verdict:
Malicious activity
Analysis date:
2025-06-04 13:49:33 UTC
Tags:
netreactor
Link:
https://app.any.run/tasks/618674c3-6903-4394-9fbc-178d9b014b08

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/7281/
Verdict:
Malicious
Score:
96.5%
Link:
https://cyber-fortress.com/docs/result/index.php?id=684047c38bd5d68a12e52259
Tags:
virus spawn shell
Result
Verdict:
Malware
Maliciousness:

Behaviour
Searching for the window
Creating a window
Сreating synchronization primitives
Creating a process with a hidden window
Creating a file in the %AppData% directory
Enabling the 'hidden' option for recently created files
Adding an access-denied ACE
Creating a file in the %temp% directory
Launching a process
Creating a file
Launching cmd.exe command interpreter
Setting browser functions hooks
Forced shutdown of a system process
Adding an exclusion to Microsoft Defender
Enabling autorun by creating a file
Unauthorized injection to a system process
Unauthorized injection to a browser process
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
expired-cert invalid-signature obfuscated packed packed packer_detected signed vbnet
Link:
https://www.filescan.io/uploads/68404733e336a33801e3178d/reports/78f64f63-6915-4fca-ab62-2696a6b606e1/overview
Verdict:
Malicious
Labled as:
Win/malicious_confidence_100%
Link:
https://www.hybrid-analysis.com/sample/876186ad1969e2f202fd93fdde333f8d042e4dd35c687a8f17723f77788d1837
Malware family:
Formbook
Create hunting rule
Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/d3d26518-2061-471f-a652-b620e0e63a39
Result
Threat name:
FormBook
Create hunting rule
Detection:
malicious
Classification:
troj.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1705947
Signature
.NET source code contains potential unpacker
Adds a directory exclusion to Windows Defender
Allocates memory in foreign processes
C2 URLs / IPs found in malware configuration
Found malware configuration
Injects a PE file into a foreign processes
Joe Sandbox ML detected suspicious sample
Loading BitLocker PowerShell Module
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
Sigma detected: Powershell Base64 Encoded MpPreference Cmdlet
Sigma detected: Scheduled temp file as task from temp location
Suricata IDS alerts for network traffic
Switches to a custom stack to bypass stack traces
System process connects to network (likely due to code injection or exploit)
Tries to detect virtualization through RDTSC time measurements
Uses netstat to query active network connections and open ports
Uses schtasks.exe or at.exe to add and modify task schedules
Uses threadpools to delay analysis
Writes to foreign memory regions
Yara detected AntiVM3
Yara detected FormBook
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1705947 Sample: RXw55HEgLS9aHXD.exe Startdate: 04/06/2025 Architecture: WINDOWS Score: 100 68 www.ky5way.pro 2->68 70 www.hkwk0.vip 2->70 72 4 other IPs or domains 2->72 78 Suricata IDS alerts for network traffic 2->78 80 Found malware configuration 2->80 82 Malicious sample detected (through community Yara rule) 2->82 84 9 other signatures 2->84 11 RXw55HEgLS9aHXD.exe 7 2->11         started        15 VrophDgFffJ.exe 5 2->15         started        17 svchost.exe 2->17         started        signatures3 process4 dnsIp5 56 C:\Users\user\AppData\...\VrophDgFffJ.exe, PE32 11->56 dropped 58 C:\Users\user\AppData\Local\...\tmp5B02.tmp, XML 11->58 dropped 60 C:\Users\user\...\RXw55HEgLS9aHXD.exe.log, ASCII 11->60 dropped 96 Uses schtasks.exe or at.exe to add and modify task schedules 11->96 98 Writes to foreign memory regions 11->98 100 Allocates memory in foreign processes 11->100 106 2 other signatures 11->106 20 vbc.exe 11->20         started        23 powershell.exe 23 11->23         started        25 powershell.exe 23 11->25         started        27 schtasks.exe 1 11->27         started        102 Multi AV Scanner detection for dropped file 15->102 104 Uses threadpools to delay analysis 15->104 29 vbc.exe 15->29         started        31 schtasks.exe 15->31         started        62 127.0.0.1 unknown unknown 17->62 file6 signatures7 process8 signatures9 86 Modifies the context of a thread in another process (thread injection) 20->86 88 Maps a DLL or memory area into another process 20->88 90 Sample uses process hollowing technique 20->90 94 3 other signatures 20->94 33 explorer.exe 37 1 20->33 injected 92 Loading BitLocker PowerShell Module 23->92 37 conhost.exe 23->37         started        39 WmiPrvSE.exe 23->39         started        41 conhost.exe 25->41         started        43 conhost.exe 27->43         started        45 conhost.exe 31->45         started        process10 dnsIp11 64 204.79.197.203, 443 MICROSOFT-CORP-MSN-AS-BLOCKUS United States 33->64 66 expired.hichina.com 47.91.170.222, 49695, 80 CNNIC-ALIBABA-US-NET-APAlibabaUSTechnologyCoLtdC United States 33->66 74 System process connects to network (likely due to code injection or exploit) 33->74 76 Uses netstat to query active network connections and open ports 33->76 47 svchost.exe 33->47         started        50 NETSTAT.EXE 33->50         started        signatures12 process13 signatures14 108 Modifies the context of a thread in another process (thread injection) 47->108 110 Maps a DLL or memory area into another process 47->110 112 Tries to detect virtualization through RDTSC time measurements 47->112 114 Switches to a custom stack to bypass stack traces 47->114 52 cmd.exe 47->52         started        process15 process16 54 conhost.exe 52->54         started       
Score:
97%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/876186ad1969e2f202fd93fdde333f8d042e4dd35c687a8f17723f77788d1837
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/876186ad1969e2f202fd93fdde333f8d042e4dd35c687a8f17723f77788d1837/
Threat name:
Win32.Backdoor.FormBook
Create hunting rule
Status:
Suspicious
First seen:
2025-06-04 08:53:26 UTC
File Type:
PE (.Net Exe)
Extracted files:
13
AV detection:
26 of 38 (68.42%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=q5qynliznhrpeax5sp654mz7rucc4totlruhvdyxoi7xo6enda3q._file
Verdict:
malicious
Label(s):
unc_loader_037
Create hunting rule
formbook
Create hunting rule
Similar samples:
1d5c6a9f196dc3d9f2e483744d7b872f01a96b8320ce3ffdc66b66542cb7a899
Formbook
53d30b6b4749ebdfdfebc9a93793ea3863d5c5ef93594e3c215d91b347db2bca
Formbook
7157f19969ea92bb660c62b91144ca8be1d6f1631252c7d1f7125fd957a1cde6
Formbook
94fbf90615b1baf84da26854c9c7b72115eaa12eb8392d898c7689f433980120
Formbook
c991a3ee832bc707306f68c46786afc17de14163f8d3c757516bac9953ad6f3b
Formbook
d079862ef124c7736c9321485c30fa19a7c944ac81bc683d123c1aa6c50414a5
Formbook
+ 2'567 additional samples on MalwareBazaar
Result
Malware family:
formbook
Create hunting rule
Score:
  10/10
Tags:
family:formbook campaign:hi26 discovery execution rat spyware stealer trojan
Link:
https://tria.ge/reports/250604-qhzsxaysdx/
Behaviour
Scheduled Task/Job: Scheduled Task
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: GetForegroundWindowSpam
Suspicious behavior: MapViewOfSection
Suspicious use of AdjustPrivilegeToken
Suspicious use of UnmapMainImage
Suspicious use of WriteProcessMemory
Enumerates physical storage devices
System Location Discovery: System Language Discovery
Suspicious use of SetThreadContext
Checks computer location settings
Uses the VBS compiler for execution
Command and Scripting Interpreter: PowerShell
Formbook payload
Formbook
Formbook family
Verdict:
Malicious
Tags:
n/a
YARA:
n/a
Link:
https://app.threat.zone/submission/4a5f5e2b-e7cc-4bbe-beec-281a37e5d906
Unpacked files
SH256 hash:
876186ad1969e2f202fd93fdde333f8d042e4dd35c687a8f17723f77788d1837
MD5 hash:
39aba001709bc965fc99edd9b6d8c059
SHA1 hash:
f5bd63cba881ab9ca58b438fb295a53f26a74df3
Link:
https://www.unpac.me/results/5fe00475-203b-42d0-b21b-720fa6d57b2e/
SH256 hash:
0b2efd5121ae97522f291f91249f3e692fad0d06540d5f9d989389ee4982cc0c
MD5 hash:
e839e7e1d85e185ea43cd6890fab5ffa
SHA1 hash:
08de4264fdb72f3245ba41ff28381e2f3c6ee432
Detections:
SUSP_OBF_NET_Reactor_Indicators_Jan24
Create hunting rule
Link:
https://www.unpac.me/results/5fe00475-203b-42d0-b21b-720fa6d57b2e/
Parent samples :
dc0eb1dd4ee4bbb3f4de84fa4dbf98cf09aee7c912c47b263dd5d704ebe2d1e0
57792bbdb2c3382f53144b267c24ced80945b8e96a7fe39e733bc2b55368c55e
876186ad1969e2f202fd93fdde333f8d042e4dd35c687a8f17723f77788d1837
6d3767d77538bda1289d139535778d0f55226481c1f5f8ee6d257cc21f968204
SH256 hash:
6b26572da8691233d12457633fe53295ee91575b88e344862d5770d68699931b
MD5 hash:
8d55e5c3ab6eee91317768423da760a8
SHA1 hash:
7305eae0ccbeb2bfc16839892ee8029a5ec5c319
Detections:
SUSP_OBF_NET_ConfuserEx_Name_Pattern_Jan24
Create hunting rule
SUSP_OBF_NET_Reactor_Indicators_Jan24
Create hunting rule
Link:
https://www.unpac.me/results/5fe00475-203b-42d0-b21b-720fa6d57b2e/
SH256 hash:
78ce5985f2ff20719b2924f128206c43d71af6eca0c88fdabeecbfef63057741
MD5 hash:
6440b1f79d6f8a2c00a8397e463becf2
SHA1 hash:
b11cecafb882f82c5fc59d60466baf0ad5dbac30
Detections:
win_formbook_w0
Create hunting rule
win_formbook_g0
Create hunting rule
win_formbook_auto
Create hunting rule
FormBook
Create hunting rule
Windows_Trojan_Formbook
Create hunting rule
Formbook
Create hunting rule
Link:
https://www.unpac.me/results/5fe00475-203b-42d0-b21b-720fa6d57b2e/
Parent samples :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 family:
FormBook
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/876186ad1969/report/overview.html
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Malicious File
Score:
1.00
Link:
https://yomi.yoroi.company/submissions/876186ad1969e2f202fd93fdde333f8d042e4dd35c687a8f17723f77788d1837

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:DebuggerCheck__GlobalFlags
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:DebuggerCheck__QueryInfo
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:DebuggerHiding__Active
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:DebuggerHiding__Thread
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:dgaagas
Create hunting rule
Author:Harshit
Description:Uses certutil.exe to download a file named test.txt
Rule name:golang_bin_JCorn_CSC846
Create hunting rule
Author:Justin Cornwell
Description:CSC-846 Golang detection ruleset
Rule name:INDICATOR_KB_CERT_7c1118cbbadc95da3752c46e47a27438
Create hunting rule
Author:ditekSHen
Description:Detects executables signed with stolen, revoked or invalid certificates
Rule name:MD5_Constants
Create hunting rule
Author:phoul (@phoul)
Description:Look for MD5 constants
Rule name:NET
Create hunting rule
Author:malware-lu
Rule name:PE_Digital_Certificate
Create hunting rule
Author:albertzsigovits
Rule name:pe_imphash
Create hunting rule
Rule name:pe_no_import_table
Create hunting rule
Description:Detect pe file that no import table
Rule name:RIPEMD160_Constants
Create hunting rule
Author:phoul (@phoul)
Description:Look for RIPEMD-160 constants
Rule name:SEH__vectored
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:SHA1_Constants
Create hunting rule
Author:phoul (@phoul)
Description:Look for SHA1 constants
Rule name:Skystars_Malware_Imphash
Create hunting rule
Author:Skystars LightDefender
Description:imphash
Rule name:Sus_Obf_Enc_Spoof_Hide_PE
Create hunting rule
Author:XiAnzheng
Description:Check for Overlay, Obfuscating, Encrypting, Spoofing, Hiding, or Entropy Technique(can create FP)

File information

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

Cape
Cape
https://www.capesandbox.com/analysis/7281/

BLint

The following table provides more information about this file using BLint. BLint is a Binary Linter to check the security properties, and capabilities in executables.

Findings
IDTitleSeverity
CHECK_AUTHENTICODEMissing Authenticodehigh
CHECK_DLL_CHARACTERISTICSMissing dll Security Characteristics (HIGH_ENTROPY_VA)high

Comments