isrstealer | 33e595babcf67d43afe50976ab1a20f58c8d737b723fbea915943e89d400e6cb

General

Target

baeaafc9f3d5c944ee7e39d2103e3c87.exe
Size

969KB
MD5

baeaafc9f3d5c944ee7e39d2103e3c87
SHA1

5f2e3c22c8fe2dcfbf8df53ba837cdc0c892f054
SHA256

33e595babcf67d43afe50976ab1a20f58c8d737b723fbea915943e89d400e6cb
SHA512

1b7fae35efd59c1816d50da18eba16ae7d7d014b81c5a773b3a72d03cbc40d8e0a19ae3737f75d595fc4ea5c2c213a42c245c07e0256e1269911823b653654af
SSDEEP

24576:BijCOCdlBNl2HvLxeRNEA/qeRdbfSsfFvEQWQeUoZ7U33SAddBLS:BiGrdlfl2PtsNEA/qe3bKQFvbePOHSAc

Score

10^/10

isrstealer persistence spyware stealer trojan upx

Malware Config

Signatures

ISR Stealer
ISR Stealer is a modified version of Hackhound Stealer written in visual basic.
trojan stealer isrstealer

ISR Stealer payload 3 IoCs

resource	yara_rule
behavioral2/memory/4624-5-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral2/memory/4624-9-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral2/memory/4624-24-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer

Executes dropped EXE 2 IoCs

pid	Process
4624	twitter.exe
3244	twitter.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

UPX packed file 5 IoCs

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

upx

resource	yara_rule
behavioral2/memory/3244-12-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/3244-16-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/3244-17-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/3244-18-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/3244-21-0x0000000000400000-0x0000000000453000-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\USER\S-1-5-21-3808065738-1666277613-1125846146-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Fire fox Update = "C:\\Users\\Admin\\AppData\\Local\\Temp\\baeaafc9f3d5c944ee7e39d2103e3c87.exe"	baeaafc9f3d5c944ee7e39d2103e3c87.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 5084 set thread context of 4624	5084	baeaafc9f3d5c944ee7e39d2103e3c87.exe	102
PID 4624 set thread context of 3244	4624	twitter.exe	103

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	5084	baeaafc9f3d5c944ee7e39d2103e3c87.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4624	twitter.exe

Suspicious use of WriteProcessMemory 16 IoCs

description	pid	Process	procid_target
PID 5084 wrote to memory of 4624	5084	baeaafc9f3d5c944ee7e39d2103e3c87.exe	102
PID 5084 wrote to memory of 4624	5084	baeaafc9f3d5c944ee7e39d2103e3c87.exe	102
PID 5084 wrote to memory of 4624	5084	baeaafc9f3d5c944ee7e39d2103e3c87.exe	102
PID 5084 wrote to memory of 4624	5084	baeaafc9f3d5c944ee7e39d2103e3c87.exe	102
PID 5084 wrote to memory of 4624	5084	baeaafc9f3d5c944ee7e39d2103e3c87.exe	102
PID 5084 wrote to memory of 4624	5084	baeaafc9f3d5c944ee7e39d2103e3c87.exe	102
PID 5084 wrote to memory of 4624	5084	baeaafc9f3d5c944ee7e39d2103e3c87.exe	102
PID 5084 wrote to memory of 4624	5084	baeaafc9f3d5c944ee7e39d2103e3c87.exe	102
PID 4624 wrote to memory of 3244	4624	twitter.exe	103
PID 4624 wrote to memory of 3244	4624	twitter.exe	103
PID 4624 wrote to memory of 3244	4624	twitter.exe	103
PID 4624 wrote to memory of 3244	4624	twitter.exe	103
PID 4624 wrote to memory of 3244	4624	twitter.exe	103
PID 4624 wrote to memory of 3244	4624	twitter.exe	103
PID 4624 wrote to memory of 3244	4624	twitter.exe	103
PID 4624 wrote to memory of 3244	4624	twitter.exe	103

C:\Users\Admin\AppData\Local\Temp\baeaafc9f3d5c944ee7e39d2103e3c87.exe
"C:\Users\Admin\AppData\Local\Temp\baeaafc9f3d5c944ee7e39d2103e3c87.exe"
1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5084
- C:\Users\Admin\AppData\Local\Temp\twitter.exe
  C:\Users\Admin\AppData\Local\Temp\twitter.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:4624
- - C:\Users\Admin\AppData\Local\Temp\twitter.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\8dbjxRbnvH.ini"
    3⤵
    - Executes dropped EXE
    PID:3244

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=1396 --field-trial-handle=2744,i,16362475727591565961,3676688664819797550,262144 --variations-seed-version /prefetch:8
1⤵
PID:2224

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\Admin\AppData\Local\Temp\8dbjxRbnvH.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
C:\Users\Admin\AppData\Local\Temp\twitter.exe

Filesize
34KB

MD5
e118330b4629b12368d91b9df6488be0

SHA1
ce90218c7e3b90df2a3409ec253048bb6472c2fd

SHA256
3a0f2936b8c45e8ba3458d69d7859a63844469e698652e15fb56639d32f40cc9

SHA512
ac91c04cb20223dbaaf594440cb778dff36e857921be427c8528ba4c6cdb3e8bf8e71e1ae8af7bde9c04ff5b97b379231625bc1a2b66aba2f98cd340cd8a94b0

Download Submit
memory/3244-16-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/3244-21-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/3244-18-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/3244-17-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/3244-12-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4624-5-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/4624-9-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/4624-24-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/5084-19-0x00000000749C0000-0x0000000074F71000-memory.dmp

Filesize
5.7MB

Download
memory/5084-0-0x00000000749C0000-0x0000000074F71000-memory.dmp

Filesize
5.7MB

Download
memory/5084-2-0x0000000001410000-0x0000000001420000-memory.dmp

Filesize
64KB

Download
memory/5084-1-0x00000000749C0000-0x0000000074F71000-memory.dmp

Filesize
5.7MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads