85116b9534fe3ff0aace7f279b8f431c65068dc3dc3516beb3842253e33724d5

Analysis

max time kernel
151s
max time network
159s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
16/06/2024, 23:21

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General

Target
85116b9534fe3ff0aace7f279b8f431c65068dc3dc3516beb3842253e33724d5.exe
Size 199KB
Sample240616-3bycqaxcpr
SHA256 85116b9534fe3ff0aace7f279b8f431c65068dc3dc3516beb3842253e33724d5
MD5 e9992c2a025407bc6620f7072c5f5208
SHA1 0b2a7bd44a0eb46974cee4eb5b11ea52414ed794
SHA512 419c8dffa745ad64c037fd265558bba0c94c63078b5477b58520273e71644958df82cf7dd6d5c210d618a7ada1d1a8582a7598b954aabba648b0208761d59556
SSDEEP 3072:a74MyJjjlLzVjN50BdQqlYgp72xzbuawaGO0OJw8KWs6IgVLE7QkfIA:awj30dlZ+GVaRVLE7QkfI
MD5 SHA1 SHA512 SSDEEP

Score

9^/10

bootkit persistence spyware stealer upx

Malware Config

Signatures

Detects executables containing base64 encoded User Agent 3 IoCs

resource	yara_rule
behavioral2/memory/1052-13-0x0000000010000000-0x0000000010056000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/1052-11-0x0000000010000000-0x0000000010056000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/1052-15-0x0000000010000000-0x0000000010056000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent

Blocklisted process makes network request 8 IoCs

flow	pid	Process
15	1052	rundll32.exe
41	1052	rundll32.exe
43	1052	rundll32.exe
42	1052	rundll32.exe
44	1052	rundll32.exe
45	1052	rundll32.exe
53	1052	rundll32.exe
59	1052	rundll32.exe

Deletes itself 1 IoCs

pid	Process
1548	dcmxuy.exe

Executes dropped EXE 1 IoCs

pid	Process
1548	dcmxuy.exe

Loads dropped DLL 1 IoCs

pid	Process
1052	rundll32.exe

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

UPX packed file 5 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/memory/4024-0-0x0000000000400000-0x000000000044A000-memory.dmp	upx
behavioral2/memory/4024-2-0x0000000000400000-0x000000000044A000-memory.dmp	upx
behavioral2/files/0x0008000000023237-3.dat	upx
behavioral2/memory/1548-6-0x0000000000400000-0x000000000044A000-memory.dmp	upx
behavioral2/memory/1548-8-0x0000000000400000-0x000000000044A000-memory.dmp	upx

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\USER\S-1-5-21-3808065738-1666277613-1125846146-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Micro = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\Program Files\\ulmzl\\geyza.dll\",method"	rundll32.exe

Enumerates connected drives 3 TTPs 2 IoCs

Attempts to read the root path of hard drives other than the default C: drive.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
File opened (read-only)	\??\a:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe

Writes to the Master Boot Record (MBR) 1 TTPs 1 IoCs

Bootkits write to the MBR to gain persistence at a level below the operating system.

bootkit persistence

Bootkit

T1542.003

description	ioc	Process
File opened for modification	\??\PHYSICALDRIVE0	rundll32.exe

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File opened for modification	\??\c:\Program Files\ulmzl	dcmxuy.exe
File created	\??\c:\Program Files\ulmzl\geyza.dll	dcmxuy.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	rundll32.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	rundll32.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
3020	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
1052	rundll32.exe
1052	rundll32.exe
1052	rundll32.exe
1052	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1052	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
4024	85116b9534fe3ff0aace7f279b8f431c65068dc3dc3516beb3842253e33724d5.exe
1548	dcmxuy.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 4024 wrote to memory of 3764	4024	85116b9534fe3ff0aace7f279b8f431c65068dc3dc3516beb3842253e33724d5.exe	90
PID 4024 wrote to memory of 3764	4024	85116b9534fe3ff0aace7f279b8f431c65068dc3dc3516beb3842253e33724d5.exe	90
PID 4024 wrote to memory of 3764	4024	85116b9534fe3ff0aace7f279b8f431c65068dc3dc3516beb3842253e33724d5.exe	90
PID 3764 wrote to memory of 3020	3764	cmd.exe	92
PID 3764 wrote to memory of 3020	3764	cmd.exe	92
PID 3764 wrote to memory of 3020	3764	cmd.exe	92
PID 3764 wrote to memory of 1548	3764	cmd.exe	93
PID 3764 wrote to memory of 1548	3764	cmd.exe	93
PID 3764 wrote to memory of 1548	3764	cmd.exe	93
PID 1548 wrote to memory of 1052	1548	dcmxuy.exe	94
PID 1548 wrote to memory of 1052	1548	dcmxuy.exe	94
PID 1548 wrote to memory of 1052	1548	dcmxuy.exe	94

C:\Users\Admin\AppData\Local\Temp\85116b9534fe3ff0aace7f279b8f431c65068dc3dc3516beb3842253e33724d5.exe
"C:\Users\Admin\AppData\Local\Temp\85116b9534fe3ff0aace7f279b8f431c65068dc3dc3516beb3842253e33724d5.exe"
1⤵
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4024
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&C:\Users\Admin\AppData\Local\Temp\\dcmxuy.exe "C:\Users\Admin\AppData\Local\Temp\85116b9534fe3ff0aace7f279b8f431c65068dc3dc3516beb3842253e33724d5.exe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3764
- - C:\Windows\SysWOW64\PING.EXE
    ping 127.0.0.1 -n 2
    3⤵
    - Runs ping.exe
    PID:3020
- - C:\Users\Admin\AppData\Local\Temp\dcmxuy.exe
    C:\Users\Admin\AppData\Local\Temp\\dcmxuy.exe "C:\Users\Admin\AppData\Local\Temp\85116b9534fe3ff0aace7f279b8f431c65068dc3dc3516beb3842253e33724d5.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - Drops file in Program Files directory
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:1548
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\Program Files\ulmzl\geyza.dll",method C:\Users\Admin\AppData\Local\Temp\dcmxuy.exe
      4⤵
      Blocklisted process makes network request
      Loads dropped DLL
      Adds Run key to start application
      Enumerates connected drives
      Writes to the Master Boot Record (MBR)
      Checks processor information in registry
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:1052

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=1424 --field-trial-handle=1928,i,13242902252791919845,10377620236057253993,262144 --variations-seed-version /prefetch:8
1⤵
PID:2368

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Pre-OS Boot

T1542

Bootkit

T1542.003

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Pre-OS Boot

T1542

Bootkit

T1542.003

Credential Access

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Peripheral Device Discovery

T1120

Query Registry

T1012

Remote System Discovery

T1018

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

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Downloads

dcmxuy.exe

Path C:\Users\Admin\AppData\Local\Temp\dcmxuy.exe
Size 199KB
SHA256 2c0d5c85f5589228554ae6ccd7cfdcb70aaf52efff03d20e41b6a8ac6b9c0d87
MD5 a1b9ed224cb2f14ff07edb60bee7458a
SHA1 508b5d5d299623e4f434b7895de5faf8c70c06d6
SHA512 5c9f10f9dbc872a7bcc7ea6c808226f8b755e7e2975d449ed4a234e7fd5d3ac054d7a6f94f2d0ecc6679cbecf90d871719e80274fc9225201b30fb2fe4ddf7b3
SSDEEP 3072:a74MyJjjlLzVjN50BdQqlYgp72xzbuawaGO0OJw8KWs6IgVLE7QkfIA:awj30dlZ+GVaRVLE7QkfI
MD5 SHA1 SHA512 SSDEEP

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geyza.dll

Path \??\c:\Program Files\ulmzl\geyza.dll
Size 148KB
SHA256 a4a40afee2e833a5a582d7b9d146d3c3e12fbaf10f522ff51939fbe512a5a8f3
MD5 21f3e95ceabc201f87c4527cc2a7de2a
SHA1 9bea9b5d7d58d6dbb9ca81055903f0e0ff073675
SHA512 2e7c161b885b265ab680f113fd3b6055a3d04651e60be7f69a7a28c9597b36da87d8e50cabf91c99bcea9d27ec4eeba818c69c89f70ec8e066d601a41f72a2d3
SSDEEP 3072:VniPfUkOBCPiik5qOu5p/X+HB2n1Zn4419dYOfkYbj:1i38Bb5qOWlX+HY1Zn40958Y/
MD5 SHA1 SHA512 SSDEEP

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memory/1052-13-0x0000000010000000-0x0000000010056000-memory.dmp

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memory/1052-14-0x0000000010050000-0x0000000010051000-memory.dmp

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memory/1052-11-0x0000000010000000-0x0000000010056000-memory.dmp

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memory/1052-15-0x0000000010000000-0x0000000010056000-memory.dmp

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memory/1548-6-0x0000000000400000-0x000000000044A000-memory.dmp

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memory/1548-8-0x0000000000400000-0x000000000044A000-memory.dmp

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memory/4024-0-0x0000000000400000-0x000000000044A000-memory.dmp

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memory/4024-2-0x0000000000400000-0x000000000044A000-memory.dmp

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