4193f57c71a4c5a46fb50bbadee6e9d1786bba4820f17da52bbd0b741e311693

General

Target

4193f57c71a4c5a46fb50bbadee6e9d1786bba4820f17da52bbd0b741e311693.exe
Size

387KB
MD5

6a83e0018512174846a87c577db58ba2
SHA1

91e67bb940eb4736aca57e93f9251cc21816e7fd
SHA256

4193f57c71a4c5a46fb50bbadee6e9d1786bba4820f17da52bbd0b741e311693
SHA512

52032a277a6c5f204efce6b122c453c08bcc9bb47b1f486d27a328e197163f24abef622744879dadc69ea4d771e4b1f8e925c6556014d9177f0e5dad12dd9a85
SSDEEP

6144:/rTfUHeeSKOS9ccFKk3Y9t9YZjuiYz1MpA5nL:/n8yN0Mr8ZjtI1z5nL

Score

9^/10

Malware Config

Signatures

UPX dump on OEP (original entry point) 20 IoCs

resource	yara_rule
behavioral2/memory/1496-0-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX
behavioral2/files/0x0008000000023270-4.dat	UPX
behavioral2/memory/4160-6-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX
behavioral2/memory/1496-8-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX
behavioral2/memory/4160-9-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX
behavioral2/memory/4160-10-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX
behavioral2/memory/4160-13-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX
behavioral2/memory/4160-17-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX
behavioral2/files/0x0004000000009f86-18.dat	UPX
behavioral2/memory/4160-21-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX
behavioral2/memory/4160-22-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX
behavioral2/memory/4160-27-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX
behavioral2/memory/4160-28-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX
behavioral2/memory/4160-34-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX
behavioral2/memory/4160-38-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX
behavioral2/memory/4160-45-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX
behavioral2/memory/4160-46-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX
behavioral2/memory/4160-54-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX
behavioral2/memory/4160-55-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX
behavioral2/memory/4160-64-0x0000000000400000-0x00000000016A8E52-memory.dmp	UPX

Executes dropped EXE 1 IoCs

pid	Process
4160	Isass.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

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3808065738-1666277613-1125846146-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Isass.exe = "C:\\Users\\Public\\Microsoft Build\\Isass.exe"	4193f57c71a4c5a46fb50bbadee6e9d1786bba4820f17da52bbd0b741e311693.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Isass.exe = "C:\\Users\\Public\\Microsoft Build\\Isass.exe"	4193f57c71a4c5a46fb50bbadee6e9d1786bba4820f17da52bbd0b741e311693.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
1496	4193f57c71a4c5a46fb50bbadee6e9d1786bba4820f17da52bbd0b741e311693.exe
1496	4193f57c71a4c5a46fb50bbadee6e9d1786bba4820f17da52bbd0b741e311693.exe
4160	Isass.exe
4160	Isass.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 1496 wrote to memory of 4160	1496	4193f57c71a4c5a46fb50bbadee6e9d1786bba4820f17da52bbd0b741e311693.exe	89
PID 1496 wrote to memory of 4160	1496	4193f57c71a4c5a46fb50bbadee6e9d1786bba4820f17da52bbd0b741e311693.exe	89
PID 1496 wrote to memory of 4160	1496	4193f57c71a4c5a46fb50bbadee6e9d1786bba4820f17da52bbd0b741e311693.exe	89

C:\Users\Admin\AppData\Local\Temp\4193f57c71a4c5a46fb50bbadee6e9d1786bba4820f17da52bbd0b741e311693.exe
"C:\Users\Admin\AppData\Local\Temp\4193f57c71a4c5a46fb50bbadee6e9d1786bba4820f17da52bbd0b741e311693.exe"
1⤵
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:1496
- C:\Users\Public\Microsoft Build\Isass.exe
  "C:\Users\Public\Microsoft Build\Isass.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  PID:4160

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=3668 --field-trial-handle=2692,i,8678872182442199182,12502579059484928042,262144 --variations-seed-version /prefetch:8
1⤵
PID:872

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
387KB

MD5
6a83e0018512174846a87c577db58ba2

SHA1
91e67bb940eb4736aca57e93f9251cc21816e7fd

SHA256
4193f57c71a4c5a46fb50bbadee6e9d1786bba4820f17da52bbd0b741e311693

SHA512
52032a277a6c5f204efce6b122c453c08bcc9bb47b1f486d27a328e197163f24abef622744879dadc69ea4d771e4b1f8e925c6556014d9177f0e5dad12dd9a85

Download Submit
C:\odt\office2016setup.exe

Filesize
5.5MB

MD5
0d87f9b022eb9de5206b939610f91c15

SHA1
af088d0b3a9888fb244affa76c327645137a3c11

SHA256
fa975a3766239301aaf689c23ffd13194e241cafc1afdfef04718cac2eae4b34

SHA512
a8f11e25dd3d8bf8e938425dc1a5692ebf7d000f9a6b2686aebf05448cea124f47717a043fcc774551bd3f12f0bcaa0d2c049caba9d06732fc7142e2185b48b0

Download Submit
memory/1496-8-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download
memory/1496-0-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download
memory/1496-1-0x0000000001AA0000-0x0000000001AA1000-memory.dmp

Filesize
4KB

Download
memory/4160-21-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download
memory/4160-28-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download
memory/4160-10-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download
memory/4160-13-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download
memory/4160-17-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download
memory/4160-7-0x0000000001A50000-0x0000000001A51000-memory.dmp

Filesize
4KB

Download
memory/4160-6-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download
memory/4160-22-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download
memory/4160-27-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download
memory/4160-9-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download
memory/4160-34-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download
memory/4160-38-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download
memory/4160-45-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download
memory/4160-46-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download
memory/4160-54-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download
memory/4160-55-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download
memory/4160-64-0x0000000000400000-0x00000000016A8E52-memory.dmp

Filesize
18.7MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads