nymaim | 270c236987f41b0a2f5e4ad10e0e4effc67514ce10862b19f7dcf2b58ce3add1

General

Target

file.exe
Size

2.0MB
MD5

9533456e3390bee683fe8d14049dd506
SHA1

d18553b6eb42b812a49a7982c79b8c4e29942912
SHA256

270c236987f41b0a2f5e4ad10e0e4effc67514ce10862b19f7dcf2b58ce3add1
SHA512

fd0ec3c52daa72c5dc55d07ea7384648bada8a3a534e2f0cf9d679306aa31129b7e712d4278854f10be0efe40cf1115bfcfc031a33952543c247ddfc09b5d33d
SSDEEP

49152:OpU849Uxc7yAbpnnD/0qSYIrtp7ldv4KxwiSgzxZ:OC8yUxiyCn1S9tp7ldv40

Score

10^/10

nymaim discovery trojan

Malware Config

Extracted

Family

nymaim

C2

45.139.105.171

85.31.46.167

Signatures

NyMaim
NyMaim is a malware with various capabilities written in C++ and first seen in 2013.
trojan nymaim

Executes dropped EXE 3 IoCs

pid	Process
3628	is-7T3HM.tmp
2204	SplitFiles116.exe
1092	Wp6JrD2KBaOWku.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation	SplitFiles116.exe

Loads dropped DLL 1 IoCs

pid	Process
3628	is-7T3HM.tmp

Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012

Drops file in Program Files directory 17 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\Split Files\is-UIO71.tmp	is-7T3HM.tmp
File created	C:\Program Files (x86)\Split Files\is-8Q3DJ.tmp	is-7T3HM.tmp
File created	C:\Program Files (x86)\Split Files\language\is-84OUQ.tmp	is-7T3HM.tmp
File created	C:\Program Files (x86)\Split Files\language\is-G8KT8.tmp	is-7T3HM.tmp
File created	C:\Program Files (x86)\Split Files\language\is-IK2P7.tmp	is-7T3HM.tmp
File opened for modification	C:\Program Files (x86)\Split Files\SplitFiles116.exe	is-7T3HM.tmp
File created	C:\Program Files (x86)\Split Files\is-BCLUR.tmp	is-7T3HM.tmp
File created	C:\Program Files (x86)\Split Files\language\is-TBHDL.tmp	is-7T3HM.tmp
File created	C:\Program Files (x86)\Split Files\is-OVJ4H.tmp	is-7T3HM.tmp
File opened for modification	C:\Program Files (x86)\Split Files\unins000.dat	is-7T3HM.tmp
File created	C:\Program Files (x86)\Split Files\unins000.dat	is-7T3HM.tmp
File created	C:\Program Files (x86)\Split Files\is-8FRL2.tmp	is-7T3HM.tmp
File created	C:\Program Files (x86)\Split Files\language\is-RE4CE.tmp	is-7T3HM.tmp
File created	C:\Program Files (x86)\Split Files\language\is-0OJE4.tmp	is-7T3HM.tmp
File created	C:\Program Files (x86)\Split Files\language\is-J8VRG.tmp	is-7T3HM.tmp
File created	C:\Program Files (x86)\Split Files\language\is-CF1NG.tmp	is-7T3HM.tmp
File created	C:\Program Files (x86)\Split Files\language\is-PBINU.tmp	is-7T3HM.tmp

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

System Information Discovery
T1082

Kills process with taskkill 1 IoCs

evasion

pid	Process
636	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
2204	SplitFiles116.exe
2204	SplitFiles116.exe
2204	SplitFiles116.exe
2204	SplitFiles116.exe
2204	SplitFiles116.exe
2204	SplitFiles116.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	636	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 400 wrote to memory of 3628	400	file.exe	83
PID 400 wrote to memory of 3628	400	file.exe	83
PID 400 wrote to memory of 3628	400	file.exe	83
PID 3628 wrote to memory of 2204	3628	is-7T3HM.tmp	84
PID 3628 wrote to memory of 2204	3628	is-7T3HM.tmp	84
PID 3628 wrote to memory of 2204	3628	is-7T3HM.tmp	84
PID 2204 wrote to memory of 1092	2204	SplitFiles116.exe	85
PID 2204 wrote to memory of 1092	2204	SplitFiles116.exe	85
PID 2204 wrote to memory of 1092	2204	SplitFiles116.exe	85
PID 2204 wrote to memory of 4212	2204	SplitFiles116.exe	93
PID 2204 wrote to memory of 4212	2204	SplitFiles116.exe	93
PID 2204 wrote to memory of 4212	2204	SplitFiles116.exe	93
PID 4212 wrote to memory of 636	4212	cmd.exe	95
PID 4212 wrote to memory of 636	4212	cmd.exe	95
PID 4212 wrote to memory of 636	4212	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:400
- C:\Users\Admin\AppData\Local\Temp\is-Q2B43.tmp\is-7T3HM.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-Q2B43.tmp\is-7T3HM.tmp" /SL4 $D01EE "C:\Users\Admin\AppData\Local\Temp\file.exe" 1796608 316928
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:3628
- - C:\Program Files (x86)\Split Files\SplitFiles116.exe
    "C:\Program Files (x86)\Split Files\SplitFiles116.exe"
    3⤵
    - Executes dropped EXE
    - Checks computer location settings
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of WriteProcessMemory
    PID:2204
  - - C:\Users\Admin\AppData\Roaming\{d6dc608d-2a27-11ed-a0e3-806e6f6e6963}\Wp6JrD2KBaOWku.exe
      4⤵
      Executes dropped EXE
      PID:1092
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c taskkill /im "SplitFiles116.exe" /f & erase "C:\Program Files (x86)\Split Files\SplitFiles116.exe" & exit
      4⤵
      Suspicious use of WriteProcessMemory
      PID:4212
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "SplitFiles116.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:636

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Program Files (x86)\Split Files\SplitFiles116.exe

Filesize
3.3MB

MD5
fcad6883f72be8457dfeea81c9558bbb

SHA1
75ab5bc1390ad1ea462d22393c32d4013f54b10c

SHA256
5162d85ca2634f4923e6a9f28255143a2619e8e49777c1beb8cb45387258d012

SHA512
2eb2ac84227f2ddfb5f472f860806c2e8c236389adc1e0d2c3a495d06732ed22785c68958bcfba811b9bfcb49272559770a9d73fd8ff31ac40c662b9b6f85add

Download Submit
C:\Program Files (x86)\Split Files\SplitFiles116.exe

Filesize
3.3MB

MD5
fcad6883f72be8457dfeea81c9558bbb

SHA1
75ab5bc1390ad1ea462d22393c32d4013f54b10c

SHA256
5162d85ca2634f4923e6a9f28255143a2619e8e49777c1beb8cb45387258d012

SHA512
2eb2ac84227f2ddfb5f472f860806c2e8c236389adc1e0d2c3a495d06732ed22785c68958bcfba811b9bfcb49272559770a9d73fd8ff31ac40c662b9b6f85add

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-0705N.tmp\_iscrypt.dll

Filesize
2KB

MD5
a69559718ab506675e907fe49deb71e9

SHA1
bc8f404ffdb1960b50c12ff9413c893b56f2e36f

SHA256
2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc

SHA512
e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-Q2B43.tmp\is-7T3HM.tmp

Filesize
903KB

MD5
a8d43e7a38a2009bd5d0527ceba02d5b

SHA1
ee273f102f2a186de3f354853ca822354ba0e52a

SHA256
7dc82ab3f67cfc883b0003562a67936b00870776d0a2c157425284772f3a64d4

SHA512
e65ec04be62811943faa59ce34d5659073865156f6cbcd6f017e3f97fd0dd306f83067324c4f58428e045009fcaeb65ae2ca019d22283030bf38c228abb7bc45

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-Q2B43.tmp\is-7T3HM.tmp

Filesize
903KB

MD5
a8d43e7a38a2009bd5d0527ceba02d5b

SHA1
ee273f102f2a186de3f354853ca822354ba0e52a

SHA256
7dc82ab3f67cfc883b0003562a67936b00870776d0a2c157425284772f3a64d4

SHA512
e65ec04be62811943faa59ce34d5659073865156f6cbcd6f017e3f97fd0dd306f83067324c4f58428e045009fcaeb65ae2ca019d22283030bf38c228abb7bc45

Download Submit
C:\Users\Admin\AppData\Roaming\{d6dc608d-2a27-11ed-a0e3-806e6f6e6963}\Wp6JrD2KBaOWku.exe

Filesize
72KB

MD5
3fb36cb0b7172e5298d2992d42984d06

SHA1
439827777df4a337cbb9fa4a4640d0d3fa1738b7

SHA256
27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

SHA512
6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

Download Submit
C:\Users\Admin\AppData\Roaming\{d6dc608d-2a27-11ed-a0e3-806e6f6e6963}\Wp6JrD2KBaOWku.exe

Filesize
72KB

MD5
3fb36cb0b7172e5298d2992d42984d06

SHA1
439827777df4a337cbb9fa4a4640d0d3fa1738b7

SHA256
27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

SHA512
6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

Download Submit
memory/400-155-0x0000000000400000-0x0000000000454000-memory.dmp

Filesize
336KB

Download
memory/400-138-0x0000000000400000-0x0000000000454000-memory.dmp

Filesize
336KB

Download
memory/400-132-0x0000000000400000-0x0000000000454000-memory.dmp

Filesize
336KB

Download
memory/636-153-0x0000000000000000-mapping.dmp

Download
memory/1092-144-0x0000000000000000-mapping.dmp

Download
memory/2204-143-0x0000000000400000-0x000000000154D000-memory.dmp

Filesize
17.3MB

Download
memory/2204-142-0x0000000000400000-0x000000000154D000-memory.dmp

Filesize
17.3MB

Download
memory/2204-147-0x0000000010000000-0x000000001001B000-memory.dmp

Filesize
108KB

Download
memory/2204-151-0x0000000000400000-0x000000000154D000-memory.dmp

Filesize
17.3MB

Download
memory/2204-139-0x0000000000000000-mapping.dmp

Download
memory/2204-154-0x0000000000400000-0x000000000154D000-memory.dmp

Filesize
17.3MB

Download
memory/3628-134-0x0000000000000000-mapping.dmp

Download
memory/4212-152-0x0000000000000000-mapping.dmp

Download

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