MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 c1ef994f31b0d0aae59985db47f85394ae12e0689385cf4a18cc0a4b8c2d8fee. 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


GuLoader


Vendor detections: 9


Intelligence 9 IOCs YARA File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: c1ef994f31b0d0aae59985db47f85394ae12e0689385cf4a18cc0a4b8c2d8fee
SHA3-384 hash: 27d6d134cd9f09501f4cda7d8183fcc27403fb6e8fb1818d2dd7a482a0f3ff705a07aaa58850e67fa428a059b848988c
SHA1 hash: e8ca8bbfde20e092bf4e63ae4a2e82bf9ce1432b
MD5 hash: fd382a67a32410c901fe41f842abbf4b
humanhash: alaska-harry-oregon-golf
File name:Proforma Invoices.exe
Download: download sample
Signature GuLoader
Create hunting rule
File size:126'976 bytes
First seen:2021-10-20 08:21:30 UTC
Last seen:2021-10-20 11:16:42 UTC
File type:Executable exe
MIME type:application/x-dosexec
imphash fd2a350e6b9d34ec5cf88c61afb9d41f (3 x GuLoader, 1 x RemcosRAT)
ssdeep 1536:8EYORuly5OAk3A83fmjKTQYhvU0S2AG7Fru6mdWmhLB:VYOcl0OAkw8xTvbV7FrYdL
Threatray 5'741 similar samples on MalwareBazaar
TLSH T153C328A251B12FD1E053063F03E54F62B937FE501A21AE1AF8CD7E7D5EB2981946238D
File icon (PE):PE icon
dhash icon 1003873d31213f10 (142 x DarkCloud, 132 x GuLoader, 35 x a310Logger)
Reporter GovCERT_CH
Tags:exe GuLoader

Intelligence

File Origin
# of uploads :
2
# of downloads :
375
Origin country :
n/a
Vendor Threat Intelligence
Detection:
n/a
Link:
https://www.capesandbox.com/analysis/198779/
Detection(s):
SecuriteInfo.com.Variant.Razy.970238.24986.23588.UNOFFICIAL
Create hunting rule

Result
Verdict:
Clean
Maliciousness:

Behaviour
Creating a window
Verdict:
Suspicious
Threat level:
  5/10
Confidence:
100%
Tags:
packed
Link:
https://www.filescan.io/uploads/616fd1afdb358dd15ec5fe96/reports/e65878ea-4748-4de7-851d-b744fac502b7/overview
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:
GuLoader
Create hunting rule
Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/76891b57-988b-4bbc-a4b2-7a738eb09582
Result
Threat name:
GuLoader FormBook
Create hunting rule
Detection:
malicious
Classification:
rans.troj.evad.spyw
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/873689
Signature
Antivirus detection for URL or domain
Benign windows process drops PE files
C2 URLs / IPs found in malware configuration
Creates autostart registry keys with suspicious values (likely registry only malware)
Creates multiple autostart registry keys
Executable has a suspicious name (potential lure to open the executable)
Found malware configuration
GuLoader behavior detected
Hides threads from debuggers
Initial sample is a PE file and has a suspicious name
Injects a PE file into a foreign processes
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)
Multi AV Scanner detection for domain / URL
Multi AV Scanner detection for dropped file
Multi AV Scanner detection for submitted file
Performs DNS queries to domains with low reputation
Potential malicious icon found
Queues an APC in another process (thread injection)
Sample uses process hollowing technique
Self deletion via cmd delete
Snort IDS alert for network traffic (e.g. based on Emerging Threat rules)
System process connects to network (likely due to code injection or exploit)
Tries to detect Any.run
Tries to detect sandboxes and other dynamic analysis tools (process name or module or function)
Tries to harvest and steal browser information (history, passwords, etc)
Tries to steal Mail credentials (via file access)
Writes to foreign memory regions
Yara detected FormBook
Yara detected Generic Dropper
Yara detected GuLoader
Yara detected VB6 Downloader Generic
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1738 Sample: Proforma Invoices.exe Startdate: 20/10/2021 Architecture: WINDOWS Score: 100 65 www.truefictionpictures.com 2->65 67 www.thesewhitevvalls.com 2->67 69 40 other IPs or domains 2->69 93 Snort IDS alert for network traffic (e.g. based on Emerging Threat rules) 2->93 95 Multi AV Scanner detection for domain / URL 2->95 97 Potential malicious icon found 2->97 99 15 other signatures 2->99 11 Proforma Invoices.exe 1 1 2->11         started        14 wscript.exe 2->14         started        16 UserOOBEBroker.exe 2->16         started        signatures3 process4 signatures5 127 Creates autostart registry keys with suspicious values (likely registry only malware) 11->127 129 Creates multiple autostart registry keys 11->129 131 Tries to detect Any.run 11->131 133 Hides threads from debuggers 11->133 18 Proforma Invoices.exe 9 11->18         started        22 sali.exe 1 14->22         started        process6 dnsIp7 71 45.137.22.77, 49775, 49786, 49834 ROOTLAYERNETNL Netherlands 18->71 101 Modifies the context of a thread in another process (thread injection) 18->101 103 Tries to detect Any.run 18->103 105 Maps a DLL or memory area into another process 18->105 111 2 other signatures 18->111 24 explorer.exe 5 6 18->24 injected 107 Multi AV Scanner detection for dropped file 22->107 109 Hides threads from debuggers 22->109 29 sali.exe 7 22->29         started        signatures8 process9 dnsIp10 73 starsspell.com 70.40.216.229, 49795, 49865, 49866 UNIFIEDLAYER-AS-1US United States 24->73 75 sunshinefamilysupport.com 15.197.142.173, 49806, 49848, 49849 TANDEMUS United States 24->75 77 18 other IPs or domains 24->77 63 C:\Users\user\AppData\...\vf7hdxkg8bxnpx.exe, PE32 24->63 dropped 119 System process connects to network (likely due to code injection or exploit) 24->119 121 Benign windows process drops PE files 24->121 31 cscript.exe 1 14 24->31         started        35 vf7hdxkg8bxnpx.exe 24->35         started        37 vf7hdxkg8bxnpx.exe 1 24->37         started        39 vf7hdxkg8bxnpx.exe 1 24->39         started        123 Tries to detect Any.run 29->123 125 Hides threads from debuggers 29->125 file11 signatures12 process13 dnsIp14 79 metalworkingadditives.com 216.66.72.155, 49847, 49850, 80 HURRICANEUS United States 31->79 81 Tries to steal Mail credentials (via file access) 31->81 83 Self deletion via cmd delete 31->83 85 Creates multiple autostart registry keys 31->85 91 5 other signatures 31->91 41 cmd.exe 2 31->41         started        44 cmd.exe 1 31->44         started        46 firefox.exe 31->46         started        87 Tries to detect Any.run 35->87 89 Hides threads from debuggers 35->89 48 vf7hdxkg8bxnpx.exe 35->48         started        51 vf7hdxkg8bxnpx.exe 37->51         started        53 vf7hdxkg8bxnpx.exe 39->53         started        signatures15 process16 file17 113 Tries to harvest and steal browser information (history, passwords, etc) 41->113 55 conhost.exe 41->55         started        57 conhost.exe 44->57         started        59 C:\Users\user\AppData\Local\Temp\...\sali.exe, PE32 48->59 dropped 61 C:\Users\user\AppData\Local\Temp\...\sali.vbs, ASCII 48->61 dropped 115 Tries to detect Any.run 48->115 117 Hides threads from debuggers 48->117 signatures18 process19
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/c1ef994f31b0d0aae59985db47f85394ae12e0689385cf4a18cc0a4b8c2d8fee/
Threat name:
Win32.Downloader.GuLoader
Create hunting rule
Status:
Malicious
First seen:
2021-10-20 08:14:45 UTC
AV detection:
12 of 44 (27.27%)
Threat level:
  3/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=yhxzstzrwdikvzmzqxnup6ctssxbfydisoc46sqyzqfexdbnr7xa._file
Verdict:
malicious
Similar samples:
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a393c2aa773ef090f5e907c90c5cf90d67c2b6db2a2ffedac0b75c748f3a7b45
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bffbffc2b1be154742fb81ecea14cb779b8fd81581ffce2855cf588f21a8020f
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e29eaf2eb064b7413755e438997bd51160816249665ba44aab2ed9b276dbfd39
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ed77b015d1ca486b1820727ec913ee0c42b3f622dae4ab25c9605f34ea13ba47
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GuLoader
+ 5'731 additional samples on MalwareBazaar
Result
Malware family:
guloader
Create hunting rule
Score:
  10/10
Tags:
family:guloader downloader
Link:
https://tria.ge/reports/211020-j9la9sggd2/
Behaviour
Suspicious use of SetWindowsHookEx
Guloader,Cloudeye
Unpacked files
SH256 hash:
c1ef994f31b0d0aae59985db47f85394ae12e0689385cf4a18cc0a4b8c2d8fee
MD5 hash:
fd382a67a32410c901fe41f842abbf4b
SHA1 hash:
e8ca8bbfde20e092bf4e63ae4a2e82bf9ce1432b
Link:
https://www.unpac.me/results/ddc603e8-1f7d-4715-a0be-f99dc1a76df4/
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Legit
Score:
0.00
Link:
https://yomi.yoroi.company/submissions/c1ef994f31b0d0aae59985db47f85394ae12e0689385cf4a18cc0a4b8c2d8fee

File information

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

Malspam

GuLoader

Executable exe c1ef994f31b0d0aae59985db47f85394ae12e0689385cf4a18cc0a4b8c2d8fee

(this sample)

  
Dropped by
guloader
  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/198779/

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