Windows 7 deprecation
Windows 7 will be removed from tria.ge on 2025-03-31
Analysis
-
max time kernel
117s -
max time network
118s -
platform
windows7_x64 -
resource
win7-20240903-en -
resource tags
arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system -
submitted
01/01/2025, 16:14 UTC
Static task
static1
Behavioral task
behavioral1
Sample
JAK Inc Remittance Notice TRD8801992 -Copy,doc.scr
Resource
win7-20240903-en
Behavioral task
behavioral2
Sample
JAK Inc Remittance Notice TRD8801992 -Copy,doc.scr
Resource
win10v2004-20241007-en
General
-
Target
JAK Inc Remittance Notice TRD8801992 -Copy,doc.scr
-
Size
987KB
-
MD5
23b640cc7b2cff45ceef1c718e7095e0
-
SHA1
dcb684e452d59af4b1bc7b5de4bdccd2b82a967b
-
SHA256
bfc7a921cd679ab7d693e30c552e352a7c564a75ec7e60b25960c63ae9067938
-
SHA512
1c77efd15a2b3dc3e74d8c808cbcbb15122699754169616e68ea024845447eacfef18b3358ed4d4ca397239f1ed9c9162cd568766baff5732c83f65f8293740d
-
SSDEEP
12288:STHHBp6sm4kri5y5dnjxfJz+V3pr+Tykm9W9LDFo+hjr0ls5PsY9Dv7QC:SThoLrimdnjxxwZAk65PvHL
Malware Config
Signatures
-
ModiLoader, DBatLoader
ModiLoader is a Delphi loader that misuses cloud services to download other malicious families.
-
Modiloader family
-
ModiLoader Second Stage 61 IoCs
resource yara_rule behavioral1/memory/2128-2-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-6-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-18-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-17-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-49-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-48-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-46-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-44-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-42-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-38-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-37-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-35-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-33-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-31-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-30-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-28-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-26-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-23-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-21-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-20-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-16-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-13-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-11-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-84-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-82-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-80-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-77-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-75-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-73-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-70-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-68-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-66-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-64-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-61-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-59-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-57-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-54-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-52-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-50-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-47-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-45-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-40-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-43-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-41-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-39-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-36-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-34-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-32-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-29-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-27-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-25-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-24-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-22-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-19-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-14-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-15-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-12-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-10-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-9-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-8-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 behavioral1/memory/2128-7-0x00000000030C0000-0x00000000040C0000-memory.dmp modiloader_stage2 -
Executes dropped EXE 1 IoCs
pid Process 2980 uzonfntK.pif -
Loads dropped DLL 2 IoCs
pid Process 2128 JAK Inc Remittance Notice TRD8801992 -Copy,doc.scr 2128 JAK Inc Remittance Notice TRD8801992 -Copy,doc.scr -
Adds Run key to start application 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-1488793075-819845221-1497111674-1000\Software\Microsoft\Windows\CurrentVersion\Run\Ktnfnozu = "C:\\Users\\Public\\Ktnfnozu.url" JAK Inc Remittance Notice TRD8801992 -Copy,doc.scr -
Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs
flow ioc 2 drive.google.com 4 drive.google.com -
Suspicious use of SetThreadContext 1 IoCs
description pid Process procid_target PID 2128 set thread context of 2980 2128 JAK Inc Remittance Notice TRD8801992 -Copy,doc.scr 33 -
System Location Discovery: System Language Discovery 1 TTPs 2 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
description ioc Process Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language JAK Inc Remittance Notice TRD8801992 -Copy,doc.scr Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language cmd.exe -
Script User-Agent 2 IoCs
Uses user-agent string associated with script host/environment.
description flow ioc HTTP User-Agent header 6 Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5) HTTP User-Agent header 4 Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5) -
Suspicious use of WriteProcessMemory 10 IoCs
description pid Process procid_target PID 2128 wrote to memory of 1652 2128 JAK Inc Remittance Notice TRD8801992 -Copy,doc.scr 31 PID 2128 wrote to memory of 1652 2128 JAK Inc Remittance Notice TRD8801992 -Copy,doc.scr 31 PID 2128 wrote to memory of 1652 2128 JAK Inc Remittance Notice TRD8801992 -Copy,doc.scr 31 PID 2128 wrote to memory of 1652 2128 JAK Inc Remittance Notice TRD8801992 -Copy,doc.scr 31 PID 2128 wrote to memory of 2980 2128 JAK Inc Remittance Notice TRD8801992 -Copy,doc.scr 33 PID 2128 wrote to memory of 2980 2128 JAK Inc Remittance Notice TRD8801992 -Copy,doc.scr 33 PID 2128 wrote to memory of 2980 2128 JAK Inc Remittance Notice TRD8801992 -Copy,doc.scr 33 PID 2128 wrote to memory of 2980 2128 JAK Inc Remittance Notice TRD8801992 -Copy,doc.scr 33 PID 2128 wrote to memory of 2980 2128 JAK Inc Remittance Notice TRD8801992 -Copy,doc.scr 33 PID 2128 wrote to memory of 2980 2128 JAK Inc Remittance Notice TRD8801992 -Copy,doc.scr 33
Processes
-
C:\Users\Admin\AppData\Local\Temp\JAK Inc Remittance Notice TRD8801992 -Copy,doc.scr"C:\Users\Admin\AppData\Local\Temp\JAK Inc Remittance Notice TRD8801992 -Copy,doc.scr" /S1⤵
- Loads dropped DLL
- Adds Run key to start application
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2128 -
C:\Windows\SysWOW64\cmd.execmd /c C:\Users\Public\Libraries\FX.cmd2⤵
- System Location Discovery: System Language Discovery
PID:1652
-
-
C:\Users\Public\Libraries\uzonfntK.pifC:\Users\Public\Libraries\uzonfntK.pif2⤵
- Executes dropped EXE
PID:2980
-
Network
-
Remote address:8.8.8.8:53Requestdrive.google.comIN AResponsedrive.google.comIN A142.250.75.238
-
Remote address:8.8.8.8:53Requestdrive.google.comIN A
-
GEThttps://drive.google.com/uc?export=download&id=1CR_4qd69QrL840hzlaewJykpuSo8ukf8JAK Inc Remittance Notice TRD8801992 -Copy,doc.scrRemote address:142.250.75.238:443RequestGET /uc?export=download&id=1CR_4qd69QrL840hzlaewJykpuSo8ukf8 HTTP/1.1
Connection: Keep-Alive
Accept: */*
User-Agent: Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5)
Host: drive.google.com
ResponseHTTP/1.1 303 See Other
Cache-Control: no-cache, no-store, max-age=0, must-revalidate
Pragma: no-cache
Expires: Mon, 01 Jan 1990 00:00:00 GMT
Date: Wed, 01 Jan 2025 16:14:49 GMT
Location: https://drive.usercontent.google.com/download?id=1CR_4qd69QrL840hzlaewJykpuSo8ukf8&export=download
Strict-Transport-Security: max-age=31536000
Content-Security-Policy: require-trusted-types-for 'script';report-uri /_/DriveUntrustedContentHttp/cspreport
Content-Security-Policy: script-src 'report-sample' 'nonce-hDNO1o0ISqshSWeTEZw27w' 'unsafe-inline';object-src 'none';base-uri 'self';report-uri /_/DriveUntrustedContentHttp/cspreport;worker-src 'self'
Accept-CH: Sec-CH-UA-Arch, Sec-CH-UA-Bitness, Sec-CH-UA-Full-Version, Sec-CH-UA-Full-Version-List, Sec-CH-UA-Model, Sec-CH-UA-WoW64, Sec-CH-UA-Form-Factors, Sec-CH-UA-Platform, Sec-CH-UA-Platform-Version
Cross-Origin-Opener-Policy: same-origin
Permissions-Policy: ch-ua-arch=*, ch-ua-bitness=*, ch-ua-full-version=*, ch-ua-full-version-list=*, ch-ua-model=*, ch-ua-wow64=*, ch-ua-form-factors=*, ch-ua-platform=*, ch-ua-platform-version=*
Server: ESF
Content-Length: 0
X-XSS-Protection: 0
X-Frame-Options: SAMEORIGIN
X-Content-Type-Options: nosniff
Alt-Svc: h3=":443"; ma=2592000,h3-29=":443"; ma=2592000
-
Remote address:8.8.8.8:53Requestdrive.usercontent.google.comIN AResponsedrive.usercontent.google.comIN A142.250.74.225
-
GEThttps://drive.usercontent.google.com/download?id=1CR_4qd69QrL840hzlaewJykpuSo8ukf8&export=downloadJAK Inc Remittance Notice TRD8801992 -Copy,doc.scrRemote address:142.250.74.225:443RequestGET /download?id=1CR_4qd69QrL840hzlaewJykpuSo8ukf8&export=download HTTP/1.1
Connection: Keep-Alive
Accept: */*
User-Agent: Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5)
Host: drive.usercontent.google.com
ResponseHTTP/1.1 200 OK
Content-Type: application/octet-stream
Content-Security-Policy: sandbox
Content-Security-Policy: default-src 'none'
Content-Security-Policy: frame-ancestors 'none'
X-Content-Security-Policy: sandbox
Cross-Origin-Opener-Policy: same-origin
Cross-Origin-Embedder-Policy: require-corp
Cross-Origin-Resource-Policy: same-site
X-Content-Type-Options: nosniff
Content-Disposition: attachment; filename="233_Ktnfnozurgp"
Access-Control-Allow-Origin: *
Access-Control-Allow-Credentials: false
Access-Control-Allow-Headers: Accept, Accept-Language, Authorization, Cache-Control, Content-Disposition, Content-Encoding, Content-Language, Content-Length, Content-MD5, Content-Range, Content-Type, Date, developer-token, financial-institution-id, X-Goog-Sn-Metadata, X-Goog-Sn-PatientId, GData-Version, google-cloud-resource-prefix, linked-customer-id, login-customer-id, x-goog-request-params, Host, If-Match, If-Modified-Since, If-None-Match, If-Unmodified-Since, Origin, OriginToken, Pragma, Range, request-id, Slug, Transfer-Encoding, hotrod-board-name, hotrod-chrome-cpu-model, hotrod-chrome-processors, Want-Digest, X-Ad-Manager-Impersonation, x-chrome-connected, X-ClientDetails, X-Client-Pctx, X-Client-Version, x-debug-settings-metadata, X-Firebase-Locale, X-Goog-Firebase-Installations-Auth, X-Firebase-Client, X-Firebase-Client-Log-Type, X-Firebase-GMPID, X-Firebase-Auth-Token, X-Firebase-AppCheck, X-Firebase-Token, X-Goog-Drive-Client-Version, X-Goog-Drive-Resource-Keys, X-GData-Client, X-GData-Key, X-GoogApps-Allowed-Domains, X-Goog-AdX-Buyer-Impersonation, X-Goog-Api-Client, X-Goog-Visibilities, X-Goog-AuthUser, X-Google-EOM, x-goog-ext-124712974-jspb, x-goog-ext-467253834-jspb, x-goog-ext-353267353-bin, x-goog-ext-353267353-jspb, x-goog-ext-251363160-jspb, x-goog-ext-259736195-jspb, x-goog-ext-477772811-jspb, x-goog-ext-359275022-bin, x-goog-ext-328800237-jspb, x-goog-ext-202735639-bin, x-goog-ext-223435598-bin, X-Goog-PageId, X-Goog-Encode-Response-If-Executable, X-Goog-Correlation-Id, X-Goog-Request-Info, X-Goog-Request-Reason, X-Goog-Request-Time, X-Goog-Experiments, x-goog-iam-authority-selector, x-goog-iam-authorization-token, X-Goog-Spatula, X-Goog-Travel-Bgr, X-Goog-Travel-Settings, X-Goog-Upload-Command, X-Goog-Upload-Content-Disposition, X-Goog-Upload-Content-Length, X-Goog-Upload-Content-Type, X-Goog-Upload-File-Name, X-Goog-Upload-Header-Content-Encoding, X-Goog-Upload-Header-Content-Length, X-Goog-Upload-Header-Content-Type, X-Goog-Upload-Header-Transfer-Encoding, X-Goog-Upload-Offset, X-Goog-Upload-Protocol, x-goog-user-project, X-Goog-Visitor-Id, X-Goog-FieldMask, X-Google-Project-Override, x-goog-maps-api-salt, x-goog-maps-api-signature, x-goog-maps-client-id, X-Goog-Api-Key, x-goog-spanner-database-role, X-HTTP-Method-Override, X-JavaScript-User-Agent, X-Pan-Versionid, X-Proxied-User-IP, X-Origin, X-Referer, X-Requested-With, X-Stadia-Client-Context, X-Upload-Content-Length, X-Upload-Content-Type, X-Use-Alt-Service, X-Use-HTTP-Status-Code-Override, X-Ios-Bundle-Identifier, X-Places-Ios-Sdk, X-Android-Package, X-Android-Cert, X-Places-Android-Sdk, X-Goog-Maps-Ios-Uuid, X-Goog-Maps-Android-Uuid, X-Ariane-Xsrf-Token, X-YouTube-Bootstrap-Logged-In, X-YouTube-VVT, X-YouTube-Page-CL, X-YouTube-Page-Timestamp, X-Compass-Routing-Destination, x-framework-xsrf-token, X-Goog-Meeting-ABR, X-Goog-Meeting-Botguardid, X-Goog-Meeting-Bot-Info, X-Goog-Meeting-ClientInfo, X-Goog-Meeting-ClientVersion, X-Goog-Meeting-Debugid, X-Goog-Meeting-Identifier, X-Goog-Meeting-Interop-Cohorts, X-Goog-Meeting-Interop-Type, X-Goog-Meeting-OidcIdToken, X-Goog-Meeting-RtcClient, X-Goog-Meeting-StartSource, X-Goog-Meeting-Token, X-Goog-Meeting-Viewer-Token, X-Client-Data, x-sdm-id-token, X-Sfdc-Authorization, MIME-Version, Content-Transfer-Encoding, X-Earth-Engine-App-ID-Token, X-Earth-Engine-Computation-Profile, X-Earth-Engine-Computation-Profiling, X-Play-Console-Experiments-Override, X-Play-Console-Session-Id, x-alkali-account-key, x-alkali-application-key, x-alkali-auth-apps-namespace, x-alkali-auth-entities-namespace, x-alkali-auth-entity, x-alkali-client-locale, EES-S7E-MODE, cast-device-capabilities, X-Server-Timeout, x-foyer-client-environment, x-goog-greenenergyuserappservice-metadata, x-goog-sherlog-context, X-Server-Token, x-rfui-request-context, x-goog-nest-jwt, X-Cloud-Trace-Context, traceparent, x-goog-chat-space-id, x-goog-pan-request-context, X-AppInt-Credentials
Access-Control-Allow-Methods: GET,HEAD,OPTIONS
Accept-Ranges: bytes
Content-Length: 820568
Last-Modified: Wed, 01 Jan 2025 08:19:34 GMT
Date: Wed, 01 Jan 2025 16:14:52 GMT
Expires: Wed, 01 Jan 2025 16:14:52 GMT
Cache-Control: private, max-age=0
X-Goog-Hash: crc32c=QiEjaw==
Server: UploadServer
Alt-Svc: h3=":443"; ma=2592000,h3-29=":443"; ma=2592000
-
190 B 92 B 4 2
-
142.250.75.238:443https://drive.google.com/uc?export=download&id=1CR_4qd69QrL840hzlaewJykpuSo8ukf8tls, httpJAK Inc Remittance Notice TRD8801992 -Copy,doc.scr901 B 8.4kB 9 10
HTTP Request
GET https://drive.google.com/uc?export=download&id=1CR_4qd69QrL840hzlaewJykpuSo8ukf8HTTP Response
303 -
142.250.74.225:443https://drive.usercontent.google.com/download?id=1CR_4qd69QrL840hzlaewJykpuSo8ukf8&export=downloadtls, httpJAK Inc Remittance Notice TRD8801992 -Copy,doc.scr17.0kB 876.1kB 351 635
HTTP Request
GET https://drive.usercontent.google.com/download?id=1CR_4qd69QrL840hzlaewJykpuSo8ukf8&export=downloadHTTP Response
200
-
124 B 78 B 2 1
DNS Request
drive.google.com
DNS Request
drive.google.com
DNS Response
142.250.75.238
-
74 B 90 B 1 1
DNS Request
drive.usercontent.google.com
DNS Response
142.250.74.225
MITRE ATT&CK Enterprise v15
Replay Monitor
Loading Replay Monitor...
Downloads
-
Filesize
8KB
MD560cd0be570decd49e4798554639a05ae
SHA1bd7bed69d9ab9a20b5263d74921c453f38477bcb
SHA256ca6a6c849496453990beceef8c192d90908c0c615fa0a1d01bcd464bad6966a5
SHA512ab3dbdb4ed95a0cb4072b23dd241149f48ecff8a69f16d81648e825d9d81a55954e5dd9bc46d3d7408421df30c901b9ad1385d1e70793fa8d715c86c9e800c57
-
Filesize
171KB
MD522331abcc9472cc9dc6f37faf333aa2c
SHA12a001c30ba79a19ceaf6a09c3567c70311760aa4
SHA256bdfa725ec2a2c8ea5861d9b4c2f608e631a183fca7916c1e07a28b656cc8ec0c
SHA512c7f5baad732424b975a426867d3d8b5424aa830aa172ed0ff0ef630070bf2b4213750e123a36d8c5a741e22d3999ca1d7e77c62d4b77d6295b20a38114b7843c