d94fc51460a8a31f58c50f1ebbeb69e0e7c26f839406b20d35eb2fa23f8ff53b

Analysis

max time kernel
150s
max time network
19s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
06-10-2024 10:09

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General

Target

Builder.exe
Size

7.4MB
MD5

840f918bb88975cf484e3d118de9d90a
SHA1

c77b22957059089e8e9af3f1b43ccf56d52044ab
SHA256

d94fc51460a8a31f58c50f1ebbeb69e0e7c26f839406b20d35eb2fa23f8ff53b
SHA512

6f9a68bac6a2fdc640e08274937da47142bd1cf5eb7208bf6cb6efc3e99d2d1be2654ae5b8ea6624cb1615255c810b832f2c3a69b48f53134f61ecb5a3615b42
SSDEEP

196608:ZuWYS6uOshoKMuIkhVastRL5Di3uq1D7mn:9YShOshouIkPftRL54DR0

Score

10^/10

discovery evasion persistence upx

Malware Config

Signatures

Modifies visiblity of hidden/system files in Explorer 2 TTPs 2 IoCs

evasion

Hidden Files and Directories

T1564.001

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\USER\S-1-5-21-457978338-2990298471-2379561640-1000\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	svchost.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-457978338-2990298471-2379561640-1000\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	explorer.exe

Executes dropped EXE 8 IoCs

pid	Process
2348	builder.exe
2740	builder.exe
1184	Process not Found
2900	icsys.icn.exe
1660	explorer.exe
2588	spoolsv.exe
2652	svchost.exe
2216	spoolsv.exe

Loads dropped DLL 9 IoCs

pid	Process
1976	Builder.exe
2348	builder.exe
2740	builder.exe
1184	Process not Found
1976	Builder.exe
2900	icsys.icn.exe
1660	explorer.exe
2588	spoolsv.exe
2652	svchost.exe

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\RunOnce\Explorer = "c:\\windows\\resources\\themes\\explorer.exe RO"	explorer.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\RunOnce\Svchost = "c:\\windows\\resources\\svchost.exe RO"	explorer.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\RunOnce\Explorer = "c:\\windows\\resources\\themes\\explorer.exe RO"	svchost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\RunOnce\Svchost = "c:\\windows\\resources\\svchost.exe RO"	svchost.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\explorer.exe	svchost.exe
File opened for modification	C:\Windows\SysWOW64\explorer.exe	explorer.exe

UPX packed file 2 IoCs

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

upx

resource	yara_rule
behavioral1/files/0x000400000001942a-33.dat	upx
behavioral1/memory/2740-37-0x000007FEF6600000-0x000007FEF6BE9000-memory.dmp	upx

Drops file in Windows directory 5 IoCs

description	ioc	Process
File opened for modification	C:\Windows\Resources\Themes\icsys.icn.exe	Builder.exe
File opened for modification	\??\c:\windows\resources\themes\explorer.exe	icsys.icn.exe
File opened for modification	\??\c:\windows\resources\spoolsv.exe	explorer.exe
File opened for modification	\??\c:\windows\resources\svchost.exe	spoolsv.exe
File opened for modification	C:\Windows\Resources\tjud.exe	explorer.exe

System Location Discovery: System Language Discovery 1 TTPs 9 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	svchost.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	icsys.icn.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	explorer.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	spoolsv.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Builder.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	spoolsv.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 3 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
2632	schtasks.exe
1372	schtasks.exe
1796	schtasks.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
1976	Builder.exe
1976	Builder.exe
1976	Builder.exe
1976	Builder.exe
1976	Builder.exe
1976	Builder.exe
1976	Builder.exe
1976	Builder.exe
1976	Builder.exe
1976	Builder.exe
1976	Builder.exe
1976	Builder.exe
1976	Builder.exe
1976	Builder.exe
1976	Builder.exe
1976	Builder.exe
2900	icsys.icn.exe
2900	icsys.icn.exe
2900	icsys.icn.exe
2900	icsys.icn.exe
2900	icsys.icn.exe
2900	icsys.icn.exe
2900	icsys.icn.exe
2900	icsys.icn.exe
2900	icsys.icn.exe
2900	icsys.icn.exe
2900	icsys.icn.exe
2900	icsys.icn.exe
2900	icsys.icn.exe
2900	icsys.icn.exe
2900	icsys.icn.exe
2900	icsys.icn.exe
2900	icsys.icn.exe
1660	explorer.exe
1660	explorer.exe
1660	explorer.exe
1660	explorer.exe
1660	explorer.exe
1660	explorer.exe
1660	explorer.exe
1660	explorer.exe
1660	explorer.exe
1660	explorer.exe
1660	explorer.exe
1660	explorer.exe
1660	explorer.exe
1660	explorer.exe
1660	explorer.exe
1660	explorer.exe
2652	svchost.exe
2652	svchost.exe
2652	svchost.exe
2652	svchost.exe
2652	svchost.exe
2652	svchost.exe
2652	svchost.exe
2652	svchost.exe
2652	svchost.exe
2652	svchost.exe
2652	svchost.exe
2652	svchost.exe
2652	svchost.exe
2652	svchost.exe
2652	svchost.exe

Suspicious behavior: GetForegroundWindowSpam 2 IoCs

pid	Process
1660	explorer.exe
2652	svchost.exe

Suspicious use of SetWindowsHookEx 12 IoCs

pid	Process
1976	Builder.exe
1976	Builder.exe
2900	icsys.icn.exe
2900	icsys.icn.exe
1660	explorer.exe
1660	explorer.exe
2588	spoolsv.exe
2588	spoolsv.exe
2652	svchost.exe
2652	svchost.exe
2216	spoolsv.exe
2216	spoolsv.exe

Suspicious use of WriteProcessMemory 43 IoCs

description	pid	Process	procid_target
PID 1976 wrote to memory of 2348	1976	Builder.exe	29
PID 1976 wrote to memory of 2348	1976	Builder.exe	29
PID 1976 wrote to memory of 2348	1976	Builder.exe	29
PID 1976 wrote to memory of 2348	1976	Builder.exe	29
PID 2348 wrote to memory of 2740	2348	builder.exe	30
PID 2348 wrote to memory of 2740	2348	builder.exe	30
PID 2348 wrote to memory of 2740	2348	builder.exe	30
PID 1976 wrote to memory of 2900	1976	Builder.exe	31
PID 1976 wrote to memory of 2900	1976	Builder.exe	31
PID 1976 wrote to memory of 2900	1976	Builder.exe	31
PID 1976 wrote to memory of 2900	1976	Builder.exe	31
PID 2900 wrote to memory of 1660	2900	icsys.icn.exe	32
PID 2900 wrote to memory of 1660	2900	icsys.icn.exe	32
PID 2900 wrote to memory of 1660	2900	icsys.icn.exe	32
PID 2900 wrote to memory of 1660	2900	icsys.icn.exe	32
PID 1660 wrote to memory of 2588	1660	explorer.exe	33
PID 1660 wrote to memory of 2588	1660	explorer.exe	33
PID 1660 wrote to memory of 2588	1660	explorer.exe	33
PID 1660 wrote to memory of 2588	1660	explorer.exe	33
PID 2588 wrote to memory of 2652	2588	spoolsv.exe	34
PID 2588 wrote to memory of 2652	2588	spoolsv.exe	34
PID 2588 wrote to memory of 2652	2588	spoolsv.exe	34
PID 2588 wrote to memory of 2652	2588	spoolsv.exe	34
PID 2652 wrote to memory of 2216	2652	svchost.exe	35
PID 2652 wrote to memory of 2216	2652	svchost.exe	35
PID 2652 wrote to memory of 2216	2652	svchost.exe	35
PID 2652 wrote to memory of 2216	2652	svchost.exe	35
PID 1660 wrote to memory of 2956	1660	explorer.exe	36
PID 1660 wrote to memory of 2956	1660	explorer.exe	36
PID 1660 wrote to memory of 2956	1660	explorer.exe	36
PID 1660 wrote to memory of 2956	1660	explorer.exe	36
PID 2652 wrote to memory of 2632	2652	svchost.exe	37
PID 2652 wrote to memory of 2632	2652	svchost.exe	37
PID 2652 wrote to memory of 2632	2652	svchost.exe	37
PID 2652 wrote to memory of 2632	2652	svchost.exe	37
PID 2652 wrote to memory of 1372	2652	svchost.exe	40
PID 2652 wrote to memory of 1372	2652	svchost.exe	40
PID 2652 wrote to memory of 1372	2652	svchost.exe	40
PID 2652 wrote to memory of 1372	2652	svchost.exe	40
PID 2652 wrote to memory of 1796	2652	svchost.exe	43
PID 2652 wrote to memory of 1796	2652	svchost.exe	43
PID 2652 wrote to memory of 1796	2652	svchost.exe	43
PID 2652 wrote to memory of 1796	2652	svchost.exe	43

C:\Users\Admin\AppData\Local\Temp\Builder.exe
"C:\Users\Admin\AppData\Local\Temp\Builder.exe"
1⤵
- Loads dropped DLL
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1976
- \??\c:\users\admin\appdata\local\temp\builder.exe
  c:\users\admin\appdata\local\temp\builder.exe
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Suspicious use of WriteProcessMemory
  PID:2348
- - \??\c:\users\admin\appdata\local\temp\builder.exe
    c:\users\admin\appdata\local\temp\builder.exe
    3⤵
    - Executes dropped EXE
    - Loads dropped DLL
    PID:2740
- C:\Windows\Resources\Themes\icsys.icn.exe
  C:\Windows\Resources\Themes\icsys.icn.exe
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Windows directory
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2900
- - \??\c:\windows\resources\themes\explorer.exe
    c:\windows\resources\themes\explorer.exe
    3⤵
    - Modifies visiblity of hidden/system files in Explorer
    - Executes dropped EXE
    - Loads dropped DLL
    - Adds Run key to start application
    - Drops file in System32 directory
    - Drops file in Windows directory
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious behavior: GetForegroundWindowSpam
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:1660
  - - \??\c:\windows\resources\spoolsv.exe
      c:\windows\resources\spoolsv.exe SE
      4⤵
      Executes dropped EXE
      Loads dropped DLL
      Drops file in Windows directory
      System Location Discovery: System Language Discovery
      Suspicious use of SetWindowsHookEx
      Suspicious use of WriteProcessMemory
      PID:2588
    - - \??\c:\windows\resources\svchost.exe
        
        c:\windows\resources\svchost.exe
        5⤵
        Modifies visiblity of hidden/system files in Explorer
        Executes dropped EXE
        Loads dropped DLL
        Adds Run key to start application
        Drops file in System32 directory
        System Location Discovery: System Language Discovery
        Suspicious behavior: EnumeratesProcesses
        Suspicious behavior: GetForegroundWindowSpam
        Suspicious use of SetWindowsHookEx
        Suspicious use of WriteProcessMemory
        
        PID:2652
      - \??\c:\windows\resources\spoolsv.exe
        
        c:\windows\resources\spoolsv.exe PR
        6⤵
        Executes dropped EXE
        System Location Discovery: System Language Discovery
        Suspicious use of SetWindowsHookEx
        
        PID:2216
      - C:\Windows\SysWOW64\schtasks.exe
        
        schtasks /create /tn "svchost" /tr "c:\windows\resources\svchost.exe" /sc daily /st 10:12 /f
        6⤵
        System Location Discovery: System Language Discovery
        Scheduled Task/Job: Scheduled Task
        
        PID:2632
      - C:\Windows\SysWOW64\schtasks.exe
        
        schtasks /create /tn "svchost" /tr "c:\windows\resources\svchost.exe" /sc daily /st 10:13 /f
        6⤵
        System Location Discovery: System Language Discovery
        Scheduled Task/Job: Scheduled Task
        
        PID:1372
      - C:\Windows\SysWOW64\schtasks.exe
        
        schtasks /create /tn "svchost" /tr "c:\windows\resources\svchost.exe" /sc daily /st 10:14 /f
        6⤵
        System Location Discovery: System Language Discovery
        Scheduled Task/Job: Scheduled Task
        
        PID:1796
  - - C:\Windows\Explorer.exe
      C:\Windows\Explorer.exe
      4⤵
      PID:2956

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Hide Artifacts

T1564

Hidden Files and Directories

T1564.001

Modify Registry

T1112

Credential Access

Discovery

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\_MEI23482\python311.dll

Filesize
1.6MB

MD5
5f6fd64ec2d7d73ae49c34dd12cedb23

SHA1
c6e0385a868f3153a6e8879527749db52dce4125

SHA256
ff9f102264d1944fbfae2ba70e7a71435f51a3e8c677fd970b621c4c9ea71967

SHA512
c4be2d042c6e4d22e46eacfd550f61b8f55814bfe41d216a4df48382247df70bc63151068513855aa78f9b3d2f10ba6a824312948324c92de6dd0f6af414e8ab

Download Submit
C:\Windows\Resources\Themes\explorer.exe

Filesize
135KB

MD5
180384f9bcb5c047b94346901d9d1eee

SHA1
1e479d58d91025f5448e93047500cd5ea7d1d10c

SHA256
e62c2aa4867735519b4895f515e395c0aa43de679af60e8308d4a89a19e747b7

SHA512
449fa8195eb9fbe20fdfe0ff3777b68605193205457c06f3b4fabe28a3945c16aaac3052cbdb95d53bc6dfcc7d41b5f5eb054550c29ebfa9b7b854bd433b8247

Download Submit
\Users\Admin\AppData\Local\Temp\builder.exe

Filesize
7.3MB

MD5
a215edd9d9788492b561858e44184bca

SHA1
77d8816ecce79f525c118687149e2f3b68dcb984

SHA256
7fbbefdae9adf0f81808b9decf48c08ba4a47293e80cd4855c083ab1f392c184

SHA512
64dfdf28e74a95af3cef3ad89b45d656bb49fba705665aad7878a397f18ae1c1a7e1aca2df466e80179f130b5350f0ac1eea26affe940742c2c42b8930f035ff

Download Submit
\Windows\Resources\Themes\icsys.icn.exe

Filesize
135KB

MD5
faa69267a39df334686c7e839a77f81b

SHA1
12e762d2f5dcdd7253ccd11ba0a851ca38435c2d

SHA256
662f71f2560aff6f7eab09b8cf2b2c5e90ab7479f3269db99822b70b19236751

SHA512
3836cf86d2fc3b2957769ff274399b72c1f4f0d7f77a4b2dd1d459cfb2e156403ffe5cf54703abcf02d2af7fee707756fe99ed3d4afb17d654239e032ecb6954

Download Submit
\Windows\Resources\spoolsv.exe

Filesize
135KB

MD5
852bb816f18f58b58097659c357bf26b

SHA1
0260f8c0d60ce292c809049510f3c44b13a467a6

SHA256
873394ebfc9416b83f3bbdcbff5a447a30d159ed2d162bdf18074037c638aea4

SHA512
012a41066dac1f31aed348fdbd9f6015a716feeb40ec086db395a62aada3fb0bb8cce444ae05cc2ee515b45cc439be51cd0bf5f983d5445d64f72ccbaeae8415

Download Submit
\Windows\Resources\svchost.exe

Filesize
135KB

MD5
fe34a4d008015c586a4f4858b7281cb0

SHA1
48565b252456f64569ed9d8580ca6c058aac9335

SHA256
a28f52fb29ffe205fff7336f1548fc10b86f0892a2a32705851cc35b90eff6a6

SHA512
2a17f963e5139001615b3135ee2e3e1b76456f8bc72b928d0c64622320da1633ac3731cc6424e780c369d629a7079bbc5fdf59384c6663d9596bf801d9a8f74f

Download Submit
memory/1660-106-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1660-107-0x00000000003B0000-0x00000000003CF000-memory.dmp

Filesize
124KB

Download
memory/1976-0-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1976-105-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2216-102-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2588-103-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2652-97-0x0000000000270000-0x000000000028F000-memory.dmp

Filesize
124KB

Download
memory/2652-108-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2652-109-0x0000000000270000-0x000000000028F000-memory.dmp

Filesize
124KB

Download
memory/2740-37-0x000007FEF6600000-0x000007FEF6BE9000-memory.dmp

Filesize
5.9MB

Download
memory/2900-104-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download