91df88a8c06205a2778a876b4fdc38f410ec6cd17462c005aae4f2f5dfb6be76

General

Target

91df88a8c06205a2778a876b4fdc38f410ec6cd17462c005aae4f2f5dfb6be76.exe
Size

320KB
MD5

349f83c09896d396084fd9b69987833b
SHA1

e520760f0daaf156ef8c062fb98c939d517100ba
SHA256

91df88a8c06205a2778a876b4fdc38f410ec6cd17462c005aae4f2f5dfb6be76
SHA512

899d3240054ac42cc60774001b17a2b08dc0b44838bc65bb4e565ed95ac93f38d90843839adf4e7878a670918ba5950159a89e998575f9aade9e7fb5aa072ad4
SSDEEP

6144:9rTfUHeeSKOS9ccFKk3Y9t9YV3v3/sSQJw1TfLYTTZJS:9n8yN0Mr8eJw1aXS

Score

9^/10

persistence spyware stealer

Malware Config

Signatures

UPX dump on OEP (original entry point) 19 IoCs

Processes:

resource	yara_rule
C:\Users\Public\Microsoft Build\Isass.exe	UPX
behavioral1/memory/1956-8-0x0000000000400000-0x00000000016A8000-memory.dmp	UPX
behavioral1/memory/2352-13-0x0000000000400000-0x00000000016A8000-memory.dmp	UPX
behavioral1/memory/1956-15-0x0000000000400000-0x00000000016A8000-memory.dmp	UPX
behavioral1/memory/2352-16-0x0000000000400000-0x00000000016A8000-memory.dmp	UPX
behavioral1/memory/2352-17-0x0000000000400000-0x00000000016A8000-memory.dmp	UPX
behavioral1/memory/2352-20-0x0000000000400000-0x00000000016A8000-memory.dmp	UPX
behavioral1/memory/2352-21-0x0000000000400000-0x00000000016A8000-memory.dmp	UPX
behavioral1/memory/2352-28-0x0000000000400000-0x00000000016A8000-memory.dmp	UPX
behavioral1/memory/2352-29-0x0000000000400000-0x00000000016A8000-memory.dmp	UPX
behavioral1/memory/2352-37-0x0000000000400000-0x00000000016A8000-memory.dmp	UPX
behavioral1/memory/2352-38-0x0000000000400000-0x00000000016A8000-memory.dmp	UPX
behavioral1/memory/2352-44-0x0000000000400000-0x00000000016A8000-memory.dmp	UPX
behavioral1/memory/2352-45-0x0000000000400000-0x00000000016A8000-memory.dmp	UPX
behavioral1/memory/2352-52-0x0000000000400000-0x00000000016A8000-memory.dmp	UPX
behavioral1/memory/2352-54-0x0000000000400000-0x00000000016A8000-memory.dmp	UPX
behavioral1/memory/2352-62-0x0000000000400000-0x00000000016A8000-memory.dmp	UPX
behavioral1/memory/2352-63-0x0000000000400000-0x00000000016A8000-memory.dmp	UPX
behavioral1/memory/2352-75-0x0000000000400000-0x00000000016A8000-memory.dmp	UPX

Executes dropped EXE 1 IoCs

Processes:

Isass.exe

pid process

2352 Isass.exe

pid	process
2352	Isass.exe

Loads dropped DLL 2 IoCs

Processes:

91df88a8c06205a2778a876b4fdc38f410ec6cd17462c005aae4f2f5dfb6be76.exe

pid	process
1956	91df88a8c06205a2778a876b4fdc38f410ec6cd17462c005aae4f2f5dfb6be76.exe
1956	91df88a8c06205a2778a876b4fdc38f410ec6cd17462c005aae4f2f5dfb6be76.exe

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

91df88a8c06205a2778a876b4fdc38f410ec6cd17462c005aae4f2f5dfb6be76.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-3452737119-3959686427-228443150-1000\Software\Microsoft\Windows\CurrentVersion\Run\Isass.exe = "C:\\Users\\Public\\Microsoft Build\\Isass.exe"	91df88a8c06205a2778a876b4fdc38f410ec6cd17462c005aae4f2f5dfb6be76.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\Isass.exe = "C:\\Users\\Public\\Microsoft Build\\Isass.exe"	91df88a8c06205a2778a876b4fdc38f410ec6cd17462c005aae4f2f5dfb6be76.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

91df88a8c06205a2778a876b4fdc38f410ec6cd17462c005aae4f2f5dfb6be76.exeIsass.exe

pid process

1956 91df88a8c06205a2778a876b4fdc38f410ec6cd17462c005aae4f2f5dfb6be76.exe
2352 Isass.exe

Suspicious use of WriteProcessMemory 4 IoCs

Processes:

91df88a8c06205a2778a876b4fdc38f410ec6cd17462c005aae4f2f5dfb6be76.exe

description	pid	process	target process
PID 1956 wrote to memory of 2352	1956	91df88a8c06205a2778a876b4fdc38f410ec6cd17462c005aae4f2f5dfb6be76.exe	Isass.exe
PID 1956 wrote to memory of 2352	1956	91df88a8c06205a2778a876b4fdc38f410ec6cd17462c005aae4f2f5dfb6be76.exe	Isass.exe
PID 1956 wrote to memory of 2352	1956	91df88a8c06205a2778a876b4fdc38f410ec6cd17462c005aae4f2f5dfb6be76.exe	Isass.exe
PID 1956 wrote to memory of 2352	1956	91df88a8c06205a2778a876b4fdc38f410ec6cd17462c005aae4f2f5dfb6be76.exe	Isass.exe

C:\Users\Admin\AppData\Local\Temp\91df88a8c06205a2778a876b4fdc38f410ec6cd17462c005aae4f2f5dfb6be76.exe
"C:\Users\Admin\AppData\Local\Temp\91df88a8c06205a2778a876b4fdc38f410ec6cd17462c005aae4f2f5dfb6be76.exe"
1⤵
- Loads dropped DLL
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:1956

C:\Users\Public\Microsoft Build\Isass.exe
"C:\Users\Public\Microsoft Build\Isass.exe"
2⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
PID:2352

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

Unsecured Credentials

1

T1552

Credentials In Files

1

T1552.001

Discovery

Lateral Movement

Collection

Data from Local System

1

T1005

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Public\Microsoft Build\Isass.exe

Filesize
320KB

MD5
349f83c09896d396084fd9b69987833b

SHA1
e520760f0daaf156ef8c062fb98c939d517100ba

SHA256
91df88a8c06205a2778a876b4fdc38f410ec6cd17462c005aae4f2f5dfb6be76

SHA512
899d3240054ac42cc60774001b17a2b08dc0b44838bc65bb4e565ed95ac93f38d90843839adf4e7878a670918ba5950159a89e998575f9aade9e7fb5aa072ad4

Download Submit
memory/1956-15-0x0000000000400000-0x00000000016A8000-memory.dmp

Filesize
18.7MB

Download
memory/1956-8-0x0000000000400000-0x00000000016A8000-memory.dmp

Filesize
18.7MB

Download
memory/1956-9-0x0000000004650000-0x00000000058F8000-memory.dmp

Filesize
18.7MB

Download
memory/1956-12-0x0000000004650000-0x00000000058F8000-memory.dmp

Filesize
18.7MB

Download
memory/2352-21-0x0000000000400000-0x00000000016A8000-memory.dmp

Filesize
18.7MB

Download
memory/2352-38-0x0000000000400000-0x00000000016A8000-memory.dmp

Filesize
18.7MB

Download
memory/2352-16-0x0000000000400000-0x00000000016A8000-memory.dmp

Filesize
18.7MB

Download
memory/2352-17-0x0000000000400000-0x00000000016A8000-memory.dmp

Filesize
18.7MB

Download
memory/2352-20-0x0000000000400000-0x00000000016A8000-memory.dmp

Filesize
18.7MB

Download
memory/2352-13-0x0000000000400000-0x00000000016A8000-memory.dmp

Filesize
18.7MB

Download
memory/2352-28-0x0000000000400000-0x00000000016A8000-memory.dmp

Filesize
18.7MB

Download
memory/2352-29-0x0000000000400000-0x00000000016A8000-memory.dmp

Filesize
18.7MB

Download
memory/2352-37-0x0000000000400000-0x00000000016A8000-memory.dmp

Filesize
18.7MB

Download
memory/2352-14-0x00000000003B0000-0x00000000003B1000-memory.dmp

Filesize
4KB

Download
memory/2352-44-0x0000000000400000-0x00000000016A8000-memory.dmp

Filesize
18.7MB

Download
memory/2352-45-0x0000000000400000-0x00000000016A8000-memory.dmp

Filesize
18.7MB

Download
memory/2352-52-0x0000000000400000-0x00000000016A8000-memory.dmp

Filesize
18.7MB

Download
memory/2352-53-0x0000000004790000-0x0000000005A38000-memory.dmp

Filesize
18.7MB

Download
memory/2352-54-0x0000000000400000-0x00000000016A8000-memory.dmp

Filesize
18.7MB

Download
memory/2352-62-0x0000000000400000-0x00000000016A8000-memory.dmp

Filesize
18.7MB

Download
memory/2352-63-0x0000000000400000-0x00000000016A8000-memory.dmp

Filesize
18.7MB

Download
memory/2352-75-0x0000000000400000-0x00000000016A8000-memory.dmp

Filesize
18.7MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads