f2321f71072843517ef3a016d81facfbd9b511b9b557990e2e63bf69698fc519

Analysis

max time kernel
155s
max time network
164s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
24/11/2022, 09:52

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General

Target

f2321f71072843517ef3a016d81facfbd9b511b9b557990e2e63bf69698fc519.exe
Size

16KB
MD5

9e2c7f5b3d6dfee89c36b14825e33db5
SHA1

d390dfc17bb4b90df03cb842e4ec10a5c7e41a6b
SHA256

f2321f71072843517ef3a016d81facfbd9b511b9b557990e2e63bf69698fc519
SHA512

5ba3bf690e02c2ff1c3d36f3aca1f4fd0fc231d0c1aa33e5a95cff22eb942c1c7bffb327c2e4d043cbd2d16959171fdb1b73e9843995128b68c224230ee362a4
SSDEEP

384:U93OPkSyyNmFfR0K9erK7Xo1WQEFlAtSeaJAslHkGrM:U93ukJyNmFfFeoY1WQEF2Da+D

Score

8^/10

persistence upx

Malware Config

Signatures

Executes dropped EXE 1 IoCs

pid	Process
2120	lenyunsk.exe

Modifies AppInit DLL entries 2 TTPs
persistence

Registry Run Keys / Startup Folder
T1060

Modify Registry
T1112

UPX packed file 4 IoCs

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

upx

resource	yara_rule
behavioral2/files/0x0008000000022e04-133.dat	upx
behavioral2/files/0x0008000000022e04-134.dat	upx
behavioral2/memory/4884-135-0x0000000000400000-0x0000000000410000-memory.dmp	upx
behavioral2/memory/2120-136-0x0000000000400000-0x0000000000410000-memory.dmp	upx

Drops file in System32 directory 3 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\lenyuns.dll	f2321f71072843517ef3a016d81facfbd9b511b9b557990e2e63bf69698fc519.exe
File created	C:\Windows\SysWOW64\lenyunsk.exe	f2321f71072843517ef3a016d81facfbd9b511b9b557990e2e63bf69698fc519.exe
File opened for modification	C:\Windows\SysWOW64\lenyunsk.exe	f2321f71072843517ef3a016d81facfbd9b511b9b557990e2e63bf69698fc519.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4884 wrote to memory of 2120	4884	f2321f71072843517ef3a016d81facfbd9b511b9b557990e2e63bf69698fc519.exe	81
PID 4884 wrote to memory of 2120	4884	f2321f71072843517ef3a016d81facfbd9b511b9b557990e2e63bf69698fc519.exe	81
PID 4884 wrote to memory of 2120	4884	f2321f71072843517ef3a016d81facfbd9b511b9b557990e2e63bf69698fc519.exe	81
PID 4884 wrote to memory of 2728	4884	f2321f71072843517ef3a016d81facfbd9b511b9b557990e2e63bf69698fc519.exe	83
PID 4884 wrote to memory of 2728	4884	f2321f71072843517ef3a016d81facfbd9b511b9b557990e2e63bf69698fc519.exe	83
PID 4884 wrote to memory of 2728	4884	f2321f71072843517ef3a016d81facfbd9b511b9b557990e2e63bf69698fc519.exe	83

C:\Users\Admin\AppData\Local\Temp\f2321f71072843517ef3a016d81facfbd9b511b9b557990e2e63bf69698fc519.exe
"C:\Users\Admin\AppData\Local\Temp\f2321f71072843517ef3a016d81facfbd9b511b9b557990e2e63bf69698fc519.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of WriteProcessMemory
PID:4884
- C:\Windows\SysWOW64\lenyunsk.exe
  C:\Windows\system32\lenyunsk.exe ˜‰
  2⤵
  - Executes dropped EXE
  PID:2120
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c C:\Users\Admin\AppData\Local\Temp\f2321f71072843517ef3a016d81facfbd9b511b9b557990e2e63bf69698fc519.exe.bat
  2⤵
  PID:2728

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\f2321f71072843517ef3a016d81facfbd9b511b9b557990e2e63bf69698fc519.exe.bat

Filesize
246B

MD5
9e36869d34dd18ac0b62a7eda29041dc

SHA1
aa7a7482a9790c4fd1edeeb935d604edfae26b9b

SHA256
5ac6b356cca03de1fd3a790a409ba50067a756895c7c92fdfaf84b1b5e94b352

SHA512
9790c1b26713e5cd1adecc935b4886228e4433dff059ddb0acffb59e8e6d4037026d4f3cf9e958b7a3f7ae0e9072a69724652cc473ef6308018bb6750f2e57ae

Download Submit
C:\Windows\SysWOW64\lenyunsk.exe

Filesize
16KB

MD5
9e2c7f5b3d6dfee89c36b14825e33db5

SHA1
d390dfc17bb4b90df03cb842e4ec10a5c7e41a6b

SHA256
f2321f71072843517ef3a016d81facfbd9b511b9b557990e2e63bf69698fc519

SHA512
5ba3bf690e02c2ff1c3d36f3aca1f4fd0fc231d0c1aa33e5a95cff22eb942c1c7bffb327c2e4d043cbd2d16959171fdb1b73e9843995128b68c224230ee362a4

Download Submit
C:\Windows\SysWOW64\lenyunsk.exe

Filesize
16KB

MD5
9e2c7f5b3d6dfee89c36b14825e33db5

SHA1
d390dfc17bb4b90df03cb842e4ec10a5c7e41a6b

SHA256
f2321f71072843517ef3a016d81facfbd9b511b9b557990e2e63bf69698fc519

SHA512
5ba3bf690e02c2ff1c3d36f3aca1f4fd0fc231d0c1aa33e5a95cff22eb942c1c7bffb327c2e4d043cbd2d16959171fdb1b73e9843995128b68c224230ee362a4

Download Submit
memory/2120-136-0x0000000000400000-0x0000000000410000-memory.dmp

Filesize
64KB

Download
memory/4884-135-0x0000000000400000-0x0000000000410000-memory.dmp

Filesize
64KB

Download