4bee6fb78923ae38cf0928acca63dfc3ebfcf84169476d9ee076e6812de530fb

Resubmissions

23/08/2026, 01:11

260823-bjxmlswvfw5

23/08/2026, 01:09

260823-bja4ls1fqh5

Analysis

max time kernel
58s
max time network
4s
platform
windows11-21h2_x64
resource
win11-20260513-en
resource tags

arch:x64arch:x86image:win11-20260513-enlocale:en-usos:windows11-21h2-x64systemwindows
submitted
23/08/2026, 01:11

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General

Target
loader.exe
Size 32KB
Sample260823-bjxmlswvfw
SHA256 4bee6fb78923ae38cf0928acca63dfc3ebfcf84169476d9ee076e6812de530fb
MD5 5df20452f0bc86799670d17210c3109f
SHA1 cc49ed35e4b9a9e022e0f9ea8089d06475b9d528
SHA512 ea649326b3cf46c1dc369b9bdfe70949ede359c411d92c087dbafca7cfe045f19c833e05763350e63613a058f7520aa76e39b6ee1d5367313c7ae004e02d88b5
SSDEEP 384:CWIaMV8SCarSTdUCNo0c6Xdiy0EFLQ0AjrqYQyrgggEHZUm57B:CWdMMOSxG0c6bjFElrTrh/HZUmVB
TLSH
T173E2C64F379398FDC54AC174A0FB9771A5B0FC320D745B3A8260C6761E38A946A3CA1B
MD5 SHA1 SHA512 SSDEEP TLSH

Score

5^/10

execution

Malware Config

Signatures

Drops file in System32 directory 1 IoCs

description	ioc	Process
File created	C:\Windows\System32\spool\drivers\color\mscms.dll	loader.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Executes a command shell one-liner 1 TTPs 1 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
4144	cmd.exe

Modifies registry class 21 IoCs

description	ioc	Process
Set value (data)	\REGISTRY\USER\S-1-5-21-1679180529-4058988202-686829476-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\MRUListEx = 00000000ffffffff	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-1679180529-4058988202-686829476-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell	rundll32.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-1679180529-4058988202-686829476-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\MRUListEx = ffffffff	rundll32.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-1679180529-4058988202-686829476-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\0\0 = 14002e80922b16d365937a46956b92703aca08af0000	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-1679180529-4058988202-686829476-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\0\0	rundll32.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-1679180529-4058988202-686829476-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\0\0\NodeSlot = "1"	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-1679180529-4058988202-686829476-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\Bags\1\Shell	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-1679180529-4058988202-686829476-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\Bags	rundll32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\CLSID\{4336a54d-038b-4685-ab02-99bb52d3fb8b}\Instance\	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-1679180529-4058988202-686829476-1000_Classes\Local Settings	rundll32.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-1679180529-4058988202-686829476-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\0 = 14001f50e04fd020ea3a6910a2d808002b30309d0000	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-1679180529-4058988202-686829476-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\0	rundll32.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-1679180529-4058988202-686829476-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\NodeSlots = 02	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-1679180529-4058988202-686829476-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\Bags\1	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-1679180529-4058988202-686829476-1000_Classes\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\Instance\	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-1679180529-4058988202-686829476-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU	rundll32.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-1679180529-4058988202-686829476-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\0\MRUListEx = 00000000ffffffff	rundll32.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-1679180529-4058988202-686829476-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\0\0\MRUListEx = ffffffff	rundll32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1679180529-4058988202-686829476-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\Bags\1\Shell\SniffedFolderType = "Documents"	rundll32.exe
Key created	\Registry\User\S-1-5-21-1679180529-4058988202-686829476-1000_Classes\NotificationData	rundll32.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-1679180529-4058988202-686829476-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\NodeSlots	rundll32.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
4120	rundll32.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4120	rundll32.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 4900 wrote to memory of 4144	4900	loader.exe	83
PID 4144 wrote to memory of 4120	4144	cmd.exe	84

C:\Users\Admin\AppData\Local\Temp\loader.exe
"C:\Users\Admin\AppData\Local\Temp\loader.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of WriteProcessMemory
PID:4900
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c rundll32 printui.dll,PrintUIEntry /k /n "Microsoft Print to PDF"
  2⤵
  - Executes a command shell one-liner
  - Suspicious use of WriteProcessMemory
  PID:4144
- - C:\Windows\system32\rundll32.exe
    rundll32 printui.dll,PrintUIEntry /k /n "Microsoft Print to PDF"
    3⤵
    - Modifies registry class
    - Suspicious behavior: GetForegroundWindowSpam
    - Suspicious use of SetWindowsHookEx
    PID:4120

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k PrintWorkflow -s PrintWorkflowUserSvc
1⤵
PID:2980

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

Windows Command Shell

T1059.003

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/4900-1-0x00007FF6699E0000-0x00007FF6699EF000-memory.dmp

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