299f540f9bfc0fe589ceff868b65107e0e8421116bbcff8f859f4b242105281c

Analysis

max time kernel
87s
max time network
97s
platform
windows11-21h2_x64
resource
win11-20240802-en
resource tags

arch:x64arch:x86image:win11-20240802-enlocale:en-usos:windows11-21h2-x64system
submitted
11-09-2024 21:21

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General

Target

Uninstall Better-CrewLink.exe
Size

376KB
MD5

60439acbeba63c34906cc0f0ab59ae96
SHA1

aa8578ce9a818ecda1939ca242c48d66234d02b5
SHA256

0b120c3e81296fd111c2cfb26be3bdff5592a96f90c83c0fe035173723c1bc51
SHA512

e62a1f54c26e4ba295b63a91f30d8a42319ea2b9a1c9373daef7b34b25d71285935950aa7d499691f8aba721eb6c783d6ea257b1a16a2b7c3344be7a228450e1
SSDEEP

6144:0740INcmSq4Nne67egNvbXMl7itPacq8jyWkb3s2t0EyL+yai:22VSq4c6agNv4MtPacZjIIRKJi

Score

7^/10

discovery

Malware Config

Signatures

Executes dropped EXE 1 IoCs

Processes:

Un_A.exe

pid process

5064 Un_A.exe
Loads dropped DLL 6 IoCs

Processes:

Un_A.exe

pid process

5064 Un_A.exe
5064 Un_A.exe
5064 Un_A.exe
5064 Un_A.exe
5064 Un_A.exe
5064 Un_A.exe
Enumerates processes with tasklist 1 TTPs 1 IoCs
discovery

Process Discovery
T1057

Processes:

tasklist.exe

pid process

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

System Information Discovery
T1082

pid	process
5064	Un_A.exe

pid	process
5064	Un_A.exe
5064	Un_A.exe
5064	Un_A.exe
5064	Un_A.exe
5064	Un_A.exe
5064	Un_A.exe

pid	process
416	tasklist.exe

System Location Discovery: System Language Discovery 1 TTPs 5 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

Processes:

Uninstall Better-CrewLink.exeUn_A.execmd.exefind.exetasklist.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Uninstall Better-CrewLink.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Un_A.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	find.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	tasklist.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

Processes:

Un_A.exetasklist.exe

pid process

5064 Un_A.exe
5064 Un_A.exe
416 tasklist.exe
416 tasklist.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

tasklist.exe

description pid process

Token: SeDebugPrivilege 416 tasklist.exe

pid	process
5064	Un_A.exe
5064	Un_A.exe
416	tasklist.exe
416	tasklist.exe

description	pid	process
Token: SeDebugPrivilege	416	tasklist.exe

Suspicious use of WriteProcessMemory 12 IoCs

Processes:

Uninstall Better-CrewLink.exeUn_A.execmd.exe

description	pid	process	target process
PID 3652 wrote to memory of 5064	3652	Uninstall Better-CrewLink.exe	Un_A.exe
PID 3652 wrote to memory of 5064	3652	Uninstall Better-CrewLink.exe	Un_A.exe
PID 3652 wrote to memory of 5064	3652	Uninstall Better-CrewLink.exe	Un_A.exe
PID 5064 wrote to memory of 392	5064	Un_A.exe	cmd.exe
PID 5064 wrote to memory of 392	5064	Un_A.exe	cmd.exe
PID 5064 wrote to memory of 392	5064	Un_A.exe	cmd.exe
PID 392 wrote to memory of 416	392	cmd.exe	tasklist.exe
PID 392 wrote to memory of 416	392	cmd.exe	tasklist.exe
PID 392 wrote to memory of 416	392	cmd.exe	tasklist.exe
PID 392 wrote to memory of 3204	392	cmd.exe	find.exe
PID 392 wrote to memory of 3204	392	cmd.exe	find.exe
PID 392 wrote to memory of 3204	392	cmd.exe	find.exe

C:\Users\Admin\AppData\Local\Temp\Uninstall Better-CrewLink.exe
"C:\Users\Admin\AppData\Local\Temp\Uninstall Better-CrewLink.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3652

C:\Users\Admin\AppData\Local\Temp\~nsuA.tmp\Un_A.exe
"C:\Users\Admin\AppData\Local\Temp\~nsuA.tmp\Un_A.exe" _?=C:\Users\Admin\AppData\Local\Temp\
2⤵
- Executes dropped EXE
- Loads dropped DLL
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:5064

C:\Windows\SysWOW64\cmd.exe
cmd /c tasklist /FI "USERNAME eq %USERNAME%" /FI "IMAGENAME eq Better-CrewLink.exe" | find "Better-CrewLink.exe"
3⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:392

C:\Windows\SysWOW64\tasklist.exe
tasklist /FI "USERNAME eq Admin" /FI "IMAGENAME eq Better-CrewLink.exe"
4⤵
- Enumerates processes with tasklist
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:416

C:\Windows\SysWOW64\find.exe
find "Better-CrewLink.exe"
4⤵
- System Location Discovery: System Language Discovery
PID:3204

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Process Discovery

T1057

System Information Discovery

T1082

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\nsbAF9A.tmp\StdUtils.dll

Filesize
100KB

MD5
c6a6e03f77c313b267498515488c5740

SHA1
3d49fc2784b9450962ed6b82b46e9c3c957d7c15

SHA256
b72e9013a6204e9f01076dc38dabbf30870d44dfc66962adbf73619d4331601e

SHA512
9870c5879f7b72836805088079ad5bbafcb59fc3d9127f2160d4ec3d6e88d3cc8ebe5a9f5d20a4720fe6407c1336ef10f33b2b9621bc587e930d4cbacf337803

Download Submit
C:\Users\Admin\AppData\Local\Temp\nsbAF9A.tmp\System.dll

Filesize
12KB

MD5
0d7ad4f45dc6f5aa87f606d0331c6901

SHA1
48df0911f0484cbe2a8cdd5362140b63c41ee457

SHA256
3eb38ae99653a7dbc724132ee240f6e5c4af4bfe7c01d31d23faf373f9f2eaca

SHA512
c07de7308cb54205e8bd703001a7fe4fd7796c9ac1b4bb330c77c872bf712b093645f40b80ce7127531fe6746a5b66e18ea073ab6a644934abed9bb64126fea9

Download Submit
C:\Users\Admin\AppData\Local\Temp\nsbAF9A.tmp\WinShell.dll

Filesize
3KB

MD5
1cc7c37b7e0c8cd8bf04b6cc283e1e56

SHA1
0b9519763be6625bd5abce175dcc59c96d100d4c

SHA256
9be85b986ea66a6997dde658abe82b3147ed2a1a3dcb784bb5176f41d22815a6

SHA512
7acf7f8e68aa6066b59ca9f2ae2e67997e6b347bc08eb788d2a119b3295c844b5b9606757168e8d2fbd61c2cda367bf80e9e48c9a52c28d5a7a00464bfd2048f

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C:\Users\Admin\AppData\Local\Temp\nsbAF9A.tmp\nsExec.dll

Filesize
6KB

MD5
ec0504e6b8a11d5aad43b296beeb84b2

SHA1
91b5ce085130c8c7194d66b2439ec9e1c206497c

SHA256
5d9ceb1ce5f35aea5f9e5a0c0edeeec04dfefe0c77890c80c70e98209b58b962

SHA512
3f918f1b47e8a919cbe51eb17dc30acc8cfc18e743a1bae5b787d0db7d26038dc1210be98bf5ba3be8d6ed896dbbd7ac3d13e66454a98b2a38c7e69dad30bb57

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C:\Users\Admin\AppData\Local\Temp\~nsuA.tmp\Un_A.exe

Filesize
376KB

MD5
60439acbeba63c34906cc0f0ab59ae96

SHA1
aa8578ce9a818ecda1939ca242c48d66234d02b5

SHA256
0b120c3e81296fd111c2cfb26be3bdff5592a96f90c83c0fe035173723c1bc51

SHA512
e62a1f54c26e4ba295b63a91f30d8a42319ea2b9a1c9373daef7b34b25d71285935950aa7d499691f8aba721eb6c783d6ea257b1a16a2b7c3344be7a228450e1

Download Submit