c88140bcf066a56fb1d067ab538f7f7a9b39190b955ba370ffdf91cbcbf02583

General

Target

c88140bcf066a56fb1d067ab538f7f7a9b39190b955ba370ffdf91cbcbf02583.exe
Size

4.4MB
MD5

9631809ff9e66cc5809e51e2929dfbe8
SHA1

4ee1085393d94978fc17b1453517f0aa7f40b8a3
SHA256

c88140bcf066a56fb1d067ab538f7f7a9b39190b955ba370ffdf91cbcbf02583
SHA512

3e350e41e7a86756438762c0a6772e5781757bb941e8c88c58238e1f19e15a3eb743301119050b30476d69bc68568a0bad1cdd4560f1ecac2cf4c0c72c9d77d1
SSDEEP

98304:k8sjkFhRWieWT0ywsagZ9VeXD3qJJXg2cMUGZWh:2jyhRPeWvnzwrivWh

Score

9^/10

Malware Config

Signatures

UPX dump on OEP (original entry point) 3 IoCs

resource	yara_rule
behavioral1/files/0x0009000000015c71-5.dat	UPX
behavioral1/memory/1840-8-0x0000000002EF0000-0x0000000003113000-memory.dmp	UPX
behavioral1/memory/2220-110-0x0000000000400000-0x0000000000623000-memory.dmp	UPX

Checks BIOS information in registry 2 TTPs 2 IoCs

BIOS information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	WindowsLoader.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosDate	WindowsLoader.exe

Executes dropped EXE 1 IoCs

pid	Process
2220	WindowsLoader.exe

Loads dropped DLL 2 IoCs

pid	Process
1840	c88140bcf066a56fb1d067ab538f7f7a9b39190b955ba370ffdf91cbcbf02583.exe
2924	regsvr32.exe

UPX packed file 3 IoCs

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

upx

resource	yara_rule
behavioral1/files/0x0009000000015c71-5.dat	upx
behavioral1/memory/1840-8-0x0000000002EF0000-0x0000000003113000-memory.dmp	upx
behavioral1/memory/2220-110-0x0000000000400000-0x0000000000623000-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\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\Win = "rundll32 shell32,ShellExec_RunDLL regsvr32 -s \"C:\\Users\\Admin\\AppData\\Local\\Temp\\sfx.dll\""	c88140bcf066a56fb1d067ab538f7f7a9b39190b955ba370ffdf91cbcbf02583.exe

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

System Information Discovery
T1082

Enumerates system info in registry 2 TTPs 2 IoCs

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key created	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS	WindowsLoader.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\BaseBoardProduct	WindowsLoader.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2220	WindowsLoader.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
2220	WindowsLoader.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: 33	2220	WindowsLoader.exe
Token: SeIncBasePriorityPrivilege	2220	WindowsLoader.exe
Token: 33	2220	WindowsLoader.exe
Token: SeIncBasePriorityPrivilege	2220	WindowsLoader.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2220	WindowsLoader.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 1840 wrote to memory of 2220	1840	c88140bcf066a56fb1d067ab538f7f7a9b39190b955ba370ffdf91cbcbf02583.exe	28
PID 1840 wrote to memory of 2220	1840	c88140bcf066a56fb1d067ab538f7f7a9b39190b955ba370ffdf91cbcbf02583.exe	28
PID 1840 wrote to memory of 2220	1840	c88140bcf066a56fb1d067ab538f7f7a9b39190b955ba370ffdf91cbcbf02583.exe	28
PID 1840 wrote to memory of 2220	1840	c88140bcf066a56fb1d067ab538f7f7a9b39190b955ba370ffdf91cbcbf02583.exe	28
PID 1840 wrote to memory of 2468	1840	c88140bcf066a56fb1d067ab538f7f7a9b39190b955ba370ffdf91cbcbf02583.exe	30
PID 1840 wrote to memory of 2468	1840	c88140bcf066a56fb1d067ab538f7f7a9b39190b955ba370ffdf91cbcbf02583.exe	30
PID 1840 wrote to memory of 2468	1840	c88140bcf066a56fb1d067ab538f7f7a9b39190b955ba370ffdf91cbcbf02583.exe	30
PID 1840 wrote to memory of 2468	1840	c88140bcf066a56fb1d067ab538f7f7a9b39190b955ba370ffdf91cbcbf02583.exe	30
PID 2468 wrote to memory of 2924	2468	cmd.exe	32
PID 2468 wrote to memory of 2924	2468	cmd.exe	32
PID 2468 wrote to memory of 2924	2468	cmd.exe	32
PID 2468 wrote to memory of 2924	2468	cmd.exe	32
PID 2468 wrote to memory of 2924	2468	cmd.exe	32
PID 2468 wrote to memory of 2924	2468	cmd.exe	32
PID 2468 wrote to memory of 2924	2468	cmd.exe	32

C:\Users\Admin\AppData\Local\Temp\c88140bcf066a56fb1d067ab538f7f7a9b39190b955ba370ffdf91cbcbf02583.exe
"C:\Users\Admin\AppData\Local\Temp\c88140bcf066a56fb1d067ab538f7f7a9b39190b955ba370ffdf91cbcbf02583.exe"
1⤵
- Loads dropped DLL
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
PID:1840
- C:\Users\Admin\AppData\Local\Temp\WindowsLoader.exe
  C:\Users\Admin\AppData\Local\Temp\WindowsLoader.exe
  2⤵
  - Checks BIOS information in registry
  - Executes dropped EXE
  - Enumerates system info in registry
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious behavior: GetForegroundWindowSpam
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  PID:2220
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c start regsvr32 -s "C:\Users\Admin\AppData\Local\Temp\sfx.dll"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2468
- - C:\Windows\SysWOW64\regsvr32.exe
    regsvr32 -s "C:\Users\Admin\AppData\Local\Temp\sfx.dll"
    3⤵
    - Loads dropped DLL
    PID:2924

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

3

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\sfx.dll

Filesize
1.7MB

MD5
213477e5ea9cc5e1a553dedb7f0545ac

SHA1
23204a5ac52da20047555f58246528f7cc3c44fb

SHA256
f03074dc1b7ed148915c112edf33d7ff09601ed718a971e0d0574d314f74cdfc

SHA512
472b0304098dbcb489e5b3f4fef99add3f79e253dad638f96e75bd5f1c9ecdaf6d4e8e1fcd964e69256d9d8bd6dbb14632952e9da64c4d608d8818c11b156612

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

Filesize
3.8MB

MD5
323c0fd51071400b51eedb1be90a8188

SHA1
0efc35935957c25193bbe9a83ab6caa25a487ada

SHA256
2f2aba1e074f5f4baa08b524875461889f8f04d4ffc43972ac212e286022ab94

SHA512
4c501c7135962e2f02b68d6069f2191ddb76f990528dacd209955a44972122718b9598400ba829abab2d4345b4e1a4b93453c8e7ba42080bd492a34cf8443e7e

Download Submit
memory/1840-8-0x0000000002EF0000-0x0000000003113000-memory.dmp

Filesize
2.1MB

Download
memory/2220-49-0x0000000000890000-0x00000000008A0000-memory.dmp

Filesize
64KB

Download
memory/2220-20-0x0000000000660000-0x0000000000670000-memory.dmp

Filesize
64KB

Download
memory/2220-25-0x0000000000670000-0x0000000000682000-memory.dmp

Filesize
72KB

Download
memory/2220-41-0x0000000000690000-0x00000000006A1000-memory.dmp

Filesize
68KB

Download
memory/2220-33-0x0000000010000000-0x0000000010021000-memory.dmp

Filesize
132KB

Download
memory/2220-15-0x0000000002500000-0x00000000026A3000-memory.dmp

Filesize
1.6MB

Download
memory/2220-57-0x00000000008A0000-0x00000000008B0000-memory.dmp

Filesize
64KB

Download
memory/2220-11-0x0000000000640000-0x0000000000653000-memory.dmp

Filesize
76KB

Download
memory/2220-71-0x00000000008B0000-0x00000000008D0000-memory.dmp

Filesize
128KB

Download
memory/2220-110-0x0000000000400000-0x0000000000623000-memory.dmp

Filesize
2.1MB

Download
memory/2924-81-0x0000000010000000-0x00000000101AC000-memory.dmp

Filesize
1.7MB

Download
memory/2924-82-0x00000000000E0000-0x00000000000E6000-memory.dmp

Filesize
24KB

Download
memory/2924-85-0x0000000002450000-0x000000000257E000-memory.dmp

Filesize
1.2MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads