dc1a821510bb64fab32a16c29d554fa23f474d2e63ad250d2756a4f4c3a1501e

Analysis

max time kernel
121s
max time network
121s
platform
windows7_x64
resource
win7-20231129-en
resource tags

arch:x64arch:x86image:win7-20231129-enlocale:en-usos:windows7-x64system
submitted
09/03/2024, 16:21

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General

Target

bc41ca8b28cefbef19913892893b6fdc.exe
Size

24KB
MD5

bc41ca8b28cefbef19913892893b6fdc
SHA1

7873b97f271893da5977b7033e1d1ffca194e682
SHA256

dc1a821510bb64fab32a16c29d554fa23f474d2e63ad250d2756a4f4c3a1501e
SHA512

72a12937274234100222afd02f6e31e3de607127fe5850aaa8cfb0fa2253ede0561a46cc5c080ddb6cec99e8009d61438e7fde8040c65be994a0f2f12ef41627
SSDEEP

384:Hw8s6S7GEsv9pWDeAFBis/QhGvsFTM9/7/qI0RSojYE0W:Hw8QGEM8DeA7i+QhGvsFgiI0RS

Score

7^/10

persistence

Malware Config

Signatures

Deletes itself 1 IoCs

pid	Process
2876	cmd.exe

Executes dropped EXE 1 IoCs

pid	Process
2792	svchost.exe

Loads dropped DLL 2 IoCs

pid	Process
2924	bc41ca8b28cefbef19913892893b6fdc.exe
2924	bc41ca8b28cefbef19913892893b6fdc.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\Wow6432Node\Microsoft\Windows\CurrentVersion\RunOnce\GrpConv = "grpconv -o"	rundll32.exe

Drops file in Windows directory 7 IoCs

description	ioc	Process
File opened for modification	C:\Windows\systxm32\	bc41ca8b28cefbef19913892893b6fdc.exe
File created	C:\Windows\systxm32\svchost.exe	bc41ca8b28cefbef19913892893b6fdc.exe
File opened for modification	C:\Windows\systxm32\svchost.exe	bc41ca8b28cefbef19913892893b6fdc.exe
File created	C:\Windows\systxm32\Service.exe	bc41ca8b28cefbef19913892893b6fdc.exe
File opened for modification	C:\Windows\systxm32\	svchost.exe
File created	C:\Windows\install.inf	bc41ca8b28cefbef19913892893b6fdc.exe
File opened for modification	C:\Windows\INF\setupapi.app.log	rundll32.exe

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2092	2792	WerFault.exe	28

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	runonce.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz	runonce.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2792	svchost.exe

Suspicious use of AdjustPrivilegeToken 7 IoCs

description	pid	Process
Token: SeRestorePrivilege	1420	rundll32.exe
Token: SeRestorePrivilege	1420	rundll32.exe
Token: SeRestorePrivilege	1420	rundll32.exe
Token: SeRestorePrivilege	1420	rundll32.exe
Token: SeRestorePrivilege	1420	rundll32.exe
Token: SeRestorePrivilege	1420	rundll32.exe
Token: SeRestorePrivilege	1420	rundll32.exe

Suspicious use of WriteProcessMemory 27 IoCs

description	pid	Process	procid_target
PID 2924 wrote to memory of 2792	2924	bc41ca8b28cefbef19913892893b6fdc.exe	28
PID 2924 wrote to memory of 2792	2924	bc41ca8b28cefbef19913892893b6fdc.exe	28
PID 2924 wrote to memory of 2792	2924	bc41ca8b28cefbef19913892893b6fdc.exe	28
PID 2924 wrote to memory of 2792	2924	bc41ca8b28cefbef19913892893b6fdc.exe	28
PID 2792 wrote to memory of 2092	2792	svchost.exe	29
PID 2792 wrote to memory of 2092	2792	svchost.exe	29
PID 2792 wrote to memory of 2092	2792	svchost.exe	29
PID 2792 wrote to memory of 2092	2792	svchost.exe	29
PID 2924 wrote to memory of 1420	2924	bc41ca8b28cefbef19913892893b6fdc.exe	30
PID 2924 wrote to memory of 1420	2924	bc41ca8b28cefbef19913892893b6fdc.exe	30
PID 2924 wrote to memory of 1420	2924	bc41ca8b28cefbef19913892893b6fdc.exe	30
PID 2924 wrote to memory of 1420	2924	bc41ca8b28cefbef19913892893b6fdc.exe	30
PID 2924 wrote to memory of 1420	2924	bc41ca8b28cefbef19913892893b6fdc.exe	30
PID 2924 wrote to memory of 1420	2924	bc41ca8b28cefbef19913892893b6fdc.exe	30
PID 2924 wrote to memory of 1420	2924	bc41ca8b28cefbef19913892893b6fdc.exe	30
PID 1420 wrote to memory of 2628	1420	rundll32.exe	31
PID 1420 wrote to memory of 2628	1420	rundll32.exe	31
PID 1420 wrote to memory of 2628	1420	rundll32.exe	31
PID 1420 wrote to memory of 2628	1420	rundll32.exe	31
PID 2924 wrote to memory of 2876	2924	bc41ca8b28cefbef19913892893b6fdc.exe	32
PID 2924 wrote to memory of 2876	2924	bc41ca8b28cefbef19913892893b6fdc.exe	32
PID 2924 wrote to memory of 2876	2924	bc41ca8b28cefbef19913892893b6fdc.exe	32
PID 2924 wrote to memory of 2876	2924	bc41ca8b28cefbef19913892893b6fdc.exe	32
PID 2628 wrote to memory of 2468	2628	runonce.exe	34
PID 2628 wrote to memory of 2468	2628	runonce.exe	34
PID 2628 wrote to memory of 2468	2628	runonce.exe	34
PID 2628 wrote to memory of 2468	2628	runonce.exe	34

C:\Users\Admin\AppData\Local\Temp\bc41ca8b28cefbef19913892893b6fdc.exe
"C:\Users\Admin\AppData\Local\Temp\bc41ca8b28cefbef19913892893b6fdc.exe"
1⤵
- Loads dropped DLL
- Drops file in Windows directory
- Suspicious use of WriteProcessMemory
PID:2924
- C:\Windows\systxm32\svchost.exe
  C:\Windows\systxm32\svchost.exe
  2⤵
  - Executes dropped EXE
  - Drops file in Windows directory
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:2792
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2792 -s 92
    3⤵
    - Program crash
    PID:2092
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe setupapi,InstallHinfSection DefaultInstall 128 C:\Windows\install.inf
  2⤵
  - Adds Run key to start application
  - Drops file in Windows directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1420
- - C:\Windows\SysWOW64\runonce.exe
    "C:\Windows\system32\runonce.exe" -r
    3⤵
    - Checks processor information in registry
    - Suspicious use of WriteProcessMemory
    PID:2628
  - - C:\Windows\SysWOW64\grpconv.exe
      "C:\Windows\System32\grpconv.exe" -o
      4⤵
      PID:2468
- C:\Windows\SysWOW64\cmd.exe
  cmd /c "" .bat""
  2⤵
  - Deletes itself
  PID:2876

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

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

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\ .bat

Filesize
2KB

MD5
397d0c0d2ee36edc74904235108f9660

SHA1
edf4e335ed9a649f83a76012bd232f285fd843c2

SHA256
9303dc9d19cea525ef0aa2b431b2fd642da1d9d64555ebbd7d52c49f7e1c5a02

SHA512
5a560ede526be84a15618fab61147b162535195b2caceee78bd9c8100d5ff8f96cf0cbe0ac21db2d42663376ed4849ea3d0a4927065bea8ff97079b87821ccae

Download Submit
C:\Windows\install.inf

Filesize
2KB

MD5
9716ebac351c551a7e64d6f819ffd8b5

SHA1
9cdf8d7f0e5bd93138df1e2c920e73c2472d3ae6

SHA256
0a36fcbaae3f4af6b4e087b0e1ec5cdf129b7e6c8c6703a5b6c1dc56082cbfec

SHA512
c3db55880764af3fc9dd8de37af456919ab9f123753c68e4b48cbe410cbbd2d12f05ca241ca41f7b053602c2d01f40e77c5242d90413a3ec134967e023b02faa

Download Submit
\Windows\systxm32\svchost.exe

Filesize
24KB

MD5
bc41ca8b28cefbef19913892893b6fdc

SHA1
7873b97f271893da5977b7033e1d1ffca194e682

SHA256
dc1a821510bb64fab32a16c29d554fa23f474d2e63ad250d2756a4f4c3a1501e

SHA512
72a12937274234100222afd02f6e31e3de607127fe5850aaa8cfb0fa2253ede0561a46cc5c080ddb6cec99e8009d61438e7fde8040c65be994a0f2f12ef41627

Download Submit