62bdbdaaf5eafc7b6d3a88311a377148ef4454b030e56b0a9154ed1c421d8eb8

Analysis

max time kernel
148s
max time network
125s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260710-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260710-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
12/07/2026, 08:28

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General

Target
tbbmalloc.dll
Size 1.8MB
Sample260712-kdd3ragx2x
SHA256 62bdbdaaf5eafc7b6d3a88311a377148ef4454b030e56b0a9154ed1c421d8eb8
MD5 aaae4a4ccd92ec6d7bcfbaa58f14234d
SHA1 f455f77252f1d1dc3c6af4803755c7f91485126f
SHA512 968739110d227c0b5f6eb215f413e35a2dc49ee4d971c35de597c4635de215c72b1479fbf074a969b67b99be9b270701a9bcb2da751495c99f6d73614773a240
SSDEEP 49152:G37vA8kO9EWbKDDELz8+VNAj3MukP8vr8I9uN:GWWzY3Muqi8z
TLSH
T15195AD06A3D009A9D1B7E634CAA7833BC775B8450371E59F0255D68A2F73BD09E3B326
MD5 SHA1 SHA512 SSDEEP TLSH

Score

7^/10

collection discovery persistence

Malware Config

Signatures

Executes dropped EXE 1 IoCs

pid	Process
3000	DCRCVDrv.sys

Accesses Microsoft Outlook profiles 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2301830172-776172150-2531349243-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	jsc.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\java updater = "cmd /c start \"\" /D \"C:\\ProgramData\\java updater\" rundll32.exe"	rundll32.exe

Looks up external IP address via web service 1 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
1	icanhazip.com

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1180 set thread context of 4452	1180	rundll32.exe	89

System Location Discovery: System Language Discovery 1 TTPs 1 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	jsc.exe

Checks processor information in registry 2 TTPs 2 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\Description\System\CentralProcessor\0	jsc.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Identifier	jsc.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
4452	jsc.exe

Suspicious behavior: LoadsDriver 1 IoCs

pid	Process
820	Process not Found

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4452	jsc.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4452	jsc.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 1180 wrote to memory of 4452	1180	rundll32.exe	89
PID 1180 wrote to memory of 4452	1180	rundll32.exe	89
PID 1180 wrote to memory of 4452	1180	rundll32.exe	89
PID 1180 wrote to memory of 4452	1180	rundll32.exe	89
PID 4452 wrote to memory of 5744	4452	jsc.exe	93
PID 4452 wrote to memory of 5744	4452	jsc.exe	93
PID 4452 wrote to memory of 5744	4452	jsc.exe	93
PID 4452 wrote to memory of 5744	4452	jsc.exe	93
PID 4452 wrote to memory of 5744	4452	jsc.exe	93
PID 4452 wrote to memory of 5744	4452	jsc.exe	93
PID 4452 wrote to memory of 5744	4452	jsc.exe	93
PID 4452 wrote to memory of 5744	4452	jsc.exe	93

outlook_office_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2301830172-776172150-2531349243-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	jsc.exe

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\tbbmalloc.dll,#1
1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1180
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\jsc.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\jsc.exe"
  2⤵
  - Accesses Microsoft Outlook profiles
  - System Location Discovery: System Language Discovery
  - Checks processor information in registry
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  - outlook_office_path
  PID:4452
- - C:\Windows\Microsoft.NET\Framework64\v4.0.30319\RegAsm.exe
    "C:\Windows\Microsoft.NET\Framework64\v4.0.30319\RegAsm.exe" all --output-path "C:\Users\Admin\AppData\Local\Temp\87db212983bcec2a4088dbdc7ee249bb"
    3⤵
    PID:5744

C:\Windows\Temp\DCRCVDrv.sys
C:\Windows\Temp\DCRCVDrv.sys
1⤵
- Executes dropped EXE
PID:3000

C:\Windows\system32\cmd.exe
"cmd /c start "" /D "C:\ProgramData\java updater" rundll32.exe"
1⤵
PID:1332

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k GPSvcGroup
1⤵
PID:5016

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Email Collection

T1114

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

dpnhupnp.dll

Path C:\ProgramData\java updater\dpnhupnp.dll
Size 36KB
SHA256 e1e61831c7adf7bfce6cc4c2cc661f639bbe32ea23a85c855c9620b1335846e1
MD5 9aa3c686e004fcdb18e0f13472f1f546
SHA1 a3c47dd1202db27e8a2529d1725587766dbd7990
SHA512 02d0087c5e2175371cf88a1d56e63ce8bc636652379ce827b4261692cd7ee7a79e4cbbb4c6981f003e5dd962429756cab762b4ca3676687934f18c1709086c7b
SSDEEP 192:mNQYKapzTDPPwj4Wm2wxdzep3WoakyWGuW:I8kDgj4Wm2gqp3aWGuW
TLSH
T116F2F7867F9A38EAF472C63D84A32A5A9079F92043A247EF4351065D4C36FD06D34FE2
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

DCRCVDrv.sys

Path C:\Windows\Temp\DCRCVDrv.sys
Size 137KB
SHA256 87e8d39db624f37d3e77aedf487a2dfd197f71a4730ea74f4e7a4341deaec2ff
MD5 567c158ee0858f8e941d4ab7a6c18dbc
SHA1 47d922b0fd5d704025d14ef98ded46e74830a423
SHA512 f976cb8e9a2f0fc769e2e4345d18e1e9f01fdb1c4303eb20d94b625467e60ce20dd120e77a96d9ba498361dd6dc0066535404cb22cf99fc49607d1f35eaed2ab
SSDEEP 3072:6pEFTp46B6ETbeP/ItLK9Di8/4BQaeJzP:Y8Tp46B6EOLgBQX
TLSH
T10CD33A12A36550A4E977E2B8C6B65263EFF37861133547CF03608A654F23BE4B93A3D1
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3000-2-0x0000000000010000-0x000000000003D000-memory.dmp

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memory/3000-2325-0x0000000000010000-0x000000000003D000-memory.dmp

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memory/4452-4081-0x0000000008590000-0x000000000859A000-memory.dmp

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memory/4452-4088-0x00000000748C2000-0x00000000748C3000-memory.dmp

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memory/4452-4077-0x00000000054B0000-0x0000000005A6A000-memory.dmp

Download

memory/4452-4078-0x0000000004FA0000-0x0000000005006000-memory.dmp

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memory/4452-4079-0x00000000748B0000-0x000000007506C000-memory.dmp

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memory/4452-4080-0x0000000005D10000-0x0000000005DA2000-memory.dmp

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memory/4452-4075-0x0000000000400000-0x0000000000466000-memory.dmp

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memory/4452-4076-0x00000000748C2000-0x00000000748C3000-memory.dmp

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memory/4452-4091-0x00000000073E0000-0x0000000007456000-memory.dmp

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memory/4452-4090-0x00000000748B0000-0x000000007506C000-memory.dmp

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memory/4452-4089-0x0000000007210000-0x00000000073D2000-memory.dmp

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memory/5744-4083-0x00007FFBFB7DF000-0x00007FFBFB7E0000-memory.dmp

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memory/5744-4087-0x00007FFBFB650000-0x00007FFBFBFF4000-memory.dmp

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memory/5744-4086-0x00007FFBFB650000-0x00007FFBFBFF4000-memory.dmp

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memory/5744-4085-0x00007FFBFB650000-0x00007FFBFBFF4000-memory.dmp

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memory/5744-4084-0x00000210D3900000-0x00000210D3910000-memory.dmp

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